diff --git a/src/main/java/com/alibaba/druid/sql/ast/SQLExprImpl.java b/src/main/java/com/alibaba/druid/sql/ast/SQLExprImpl.java
index 629f1cc133..ba6486b33f 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/SQLExprImpl.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/SQLExprImpl.java
@@ -22,5 +22,8 @@ public abstract class SQLExprImpl extends SQLObjectImpl implements SQLExpr {
     public SQLExprImpl(){
 
     }
+    
+    public abstract boolean equals(Object o);
 
+    public abstract int hashCode();
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAggregateExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAggregateExpr.java
index 48e2989949..be02aab5e3 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAggregateExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAggregateExpr.java
@@ -81,4 +81,46 @@ public class SQLAggregateExpr extends SQLExprImpl implements Serializable {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((arguments == null) ? 0 : arguments.hashCode());
+        result = prime * result + ((methodName == null) ? 0 : methodName.hashCode());
+        result = prime * result + option;
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLAggregateExpr other = (SQLAggregateExpr) obj;
+        if (arguments == null) {
+            if (other.arguments != null) {
+                return false;
+            }
+        } else if (!arguments.equals(other.arguments)) {
+            return false;
+        }
+        if (methodName == null) {
+            if (other.methodName != null) {
+                return false;
+            }
+        } else if (!methodName.equals(other.methodName)) {
+            return false;
+        }
+        if (option != other.option) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAllColumnExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAllColumnExpr.java
index d488731795..b9b92a7615 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAllColumnExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAllColumnExpr.java
@@ -21,7 +21,7 @@ import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 public class SQLAllColumnExpr extends SQLExprImpl {
 
     private static final long serialVersionUID = 1L;
-
+    
     public SQLAllColumnExpr(){
 
     }
@@ -34,4 +34,12 @@ public class SQLAllColumnExpr extends SQLExprImpl {
         visitor.visit(this);
         visitor.endVisit(this);
     }
+    
+    public int hashCode() {
+        return 0;
+    }
+    
+    public boolean equals(Object o) {
+        return o instanceof SQLAllColumnExpr;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAllExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAllExpr.java
index 6bc97ab12a..b96f23797e 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAllExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAllExpr.java
@@ -53,4 +53,35 @@ public class SQLAllExpr extends SQLExprImpl {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((subQuery == null) ? 0 : subQuery.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLAllExpr other = (SQLAllExpr) obj;
+        if (subQuery == null) {
+            if (other.subQuery != null) {
+                return false;
+            }
+        } else if (!subQuery.equals(other.subQuery)) {
+            return false;
+        }
+        return true;
+    }
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAnyExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAnyExpr.java
index 59b9fd6802..ff4f10224b 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAnyExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLAnyExpr.java
@@ -53,4 +53,34 @@ public class SQLAnyExpr extends SQLExprImpl {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((subQuery == null) ? 0 : subQuery.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLAnyExpr other = (SQLAnyExpr) obj;
+        if (subQuery == null) {
+            if (other.subQuery != null) {
+                return false;
+            }
+        } else if (!subQuery.equals(other.subQuery)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLBetweenExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLBetweenExpr.java
index daf0ecca9d..b8023b20a6 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLBetweenExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLBetweenExpr.java
@@ -99,4 +99,54 @@ public class SQLBetweenExpr extends SQLExprImpl implements Serializable {
     public void setEndExpr(SQLExpr endExpr) {
         this.endExpr = endExpr;
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((beginExpr == null) ? 0 : beginExpr.hashCode());
+        result = prime * result + ((endExpr == null) ? 0 : endExpr.hashCode());
+        result = prime * result + (not ? 1231 : 1237);
+        result = prime * result + ((testExpr == null) ? 0 : testExpr.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLBetweenExpr other = (SQLBetweenExpr) obj;
+        if (beginExpr == null) {
+            if (other.beginExpr != null) {
+                return false;
+            }
+        } else if (!beginExpr.equals(other.beginExpr)) {
+            return false;
+        }
+        if (endExpr == null) {
+            if (other.endExpr != null) {
+                return false;
+            }
+        } else if (!endExpr.equals(other.endExpr)) {
+            return false;
+        }
+        if (not != other.not) {
+            return false;
+        }
+        if (testExpr == null) {
+            if (other.testExpr != null) {
+                return false;
+            }
+        } else if (!testExpr.equals(other.testExpr)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLBitStringLiteralExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLBitStringLiteralExpr.java
index 5365729d09..c0362e136f 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLBitStringLiteralExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLBitStringLiteralExpr.java
@@ -60,4 +60,34 @@ public class SQLBitStringLiteralExpr extends SQLLiteralExpr {
         }
         buf.append("'");
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLBitStringLiteralExpr other = (SQLBitStringLiteralExpr) obj;
+        if (value == null) {
+            if (other.value != null) {
+                return false;
+            }
+        } else if (!value.equals(other.value)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCaseExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCaseExpr.java
index c17e86662a..2969405125 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCaseExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCaseExpr.java
@@ -134,4 +134,52 @@ public class SQLCaseExpr extends SQLExprImpl implements Serializable {
             visitor.endVisit(this);
         }
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((elseExpr == null) ? 0 : elseExpr.hashCode());
+        result = prime * result + ((items == null) ? 0 : items.hashCode());
+        result = prime * result + ((valueExpr == null) ? 0 : valueExpr.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLCaseExpr other = (SQLCaseExpr) obj;
+        if (elseExpr == null) {
+            if (other.elseExpr != null) {
+                return false;
+            }
+        } else if (!elseExpr.equals(other.elseExpr)) {
+            return false;
+        }
+        if (items == null) {
+            if (other.items != null) {
+                return false;
+            }
+        } else if (!items.equals(other.items)) {
+            return false;
+        }
+        if (valueExpr == null) {
+            if (other.valueExpr != null) {
+                return false;
+            }
+        } else if (!valueExpr.equals(other.valueExpr)) {
+            return false;
+        }
+        return true;
+    }
+    
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCastExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCastExpr.java
index 0d1156e932..790799925b 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCastExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCastExpr.java
@@ -62,4 +62,43 @@ public class SQLCastExpr extends SQLExprImpl {
         }
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((dataType == null) ? 0 : dataType.hashCode());
+        result = prime * result + ((expr == null) ? 0 : expr.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLCastExpr other = (SQLCastExpr) obj;
+        if (dataType == null) {
+            if (other.dataType != null) {
+                return false;
+            }
+        } else if (!dataType.equals(other.dataType)) {
+            return false;
+        }
+        if (expr == null) {
+            if (other.expr != null) {
+                return false;
+            }
+        } else if (!expr.equals(other.expr)) {
+            return false;
+        }
+        return true;
+    }
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCurrentOfCursorExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCurrentOfCursorExpr.java
index 44a8730f79..9c9f0e127f 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCurrentOfCursorExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLCurrentOfCursorExpr.java
@@ -51,4 +51,34 @@ public class SQLCurrentOfCursorExpr extends SQLExprImpl {
         visitor.endVisit(this);
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((cursorName == null) ? 0 : cursorName.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLCurrentOfCursorExpr other = (SQLCurrentOfCursorExpr) obj;
+        if (cursorName == null) {
+            if (other.cursorName != null) {
+                return false;
+            }
+        } else if (!cursorName.equals(other.cursorName)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLDateLiteralExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLDateLiteralExpr.java
index 3e4be414d1..3e2f021c13 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLDateLiteralExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLDateLiteralExpr.java
@@ -48,4 +48,34 @@ public class SQLDateLiteralExpr extends SQLLiteralExpr {
         visitor.endVisit(this);
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLDateLiteralExpr other = (SQLDateLiteralExpr) obj;
+        if (value == null) {
+            if (other.value != null) {
+                return false;
+            }
+        } else if (!value.equals(other.value)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLExistsExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLExistsExpr.java
index ae592ec043..6adc58b58f 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLExistsExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLExistsExpr.java
@@ -74,4 +74,38 @@ public class SQLExistsExpr extends SQLExprImpl implements Serializable {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + (not ? 1231 : 1237);
+        result = prime * result + ((subQuery == null) ? 0 : subQuery.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLExistsExpr other = (SQLExistsExpr) obj;
+        if (not != other.not) {
+            return false;
+        }
+        if (subQuery == null) {
+            if (other.subQuery != null) {
+                return false;
+            }
+        } else if (!subQuery.equals(other.subQuery)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLHexExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLHexExpr.java
index 6c81e382ac..fed979263c 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLHexExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLHexExpr.java
@@ -46,4 +46,34 @@ public class SQLHexExpr extends SQLLiteralExpr {
         visitor.visit(this);
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((hex == null) ? 0 : hex.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLHexExpr other = (SQLHexExpr) obj;
+        if (hex == null) {
+            if (other.hex != null) {
+                return false;
+            }
+        } else if (!hex.equals(other.hex)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLHexStringLiteralExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLHexStringLiteralExpr.java
index 19e3143adc..e8c97b2308 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLHexStringLiteralExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLHexStringLiteralExpr.java
@@ -47,4 +47,34 @@ public class SQLHexStringLiteralExpr extends SQLLiteralExpr {
         buf.append(value);
         buf.append("'");
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLHexStringLiteralExpr other = (SQLHexStringLiteralExpr) obj;
+        if (value == null) {
+            if (other.value != null) {
+                return false;
+            }
+        } else if (!value.equals(other.value)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInListExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInListExpr.java
index e6fb9b7b4b..29eef29237 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInListExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInListExpr.java
@@ -96,4 +96,46 @@ public class SQLInListExpr extends SQLExprImpl implements Serializable {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((expr == null) ? 0 : expr.hashCode());
+        result = prime * result + (not ? 1231 : 1237);
+        result = prime * result + ((targetList == null) ? 0 : targetList.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLInListExpr other = (SQLInListExpr) obj;
+        if (expr == null) {
+            if (other.expr != null) {
+                return false;
+            }
+        } else if (!expr.equals(other.expr)) {
+            return false;
+        }
+        if (not != other.not) {
+            return false;
+        }
+        if (targetList == null) {
+            if (other.targetList != null) {
+                return false;
+            }
+        } else if (!targetList.equals(other.targetList)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInSubQueryExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInSubQueryExpr.java
index c2b96faf71..175e4ff594 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInSubQueryExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInSubQueryExpr.java
@@ -76,4 +76,46 @@ public class SQLInSubQueryExpr extends SQLExprImpl implements Serializable {
         visitor.endVisit(this);
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((expr == null) ? 0 : expr.hashCode());
+        result = prime * result + (not ? 1231 : 1237);
+        result = prime * result + ((subQuery == null) ? 0 : subQuery.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLInSubQueryExpr other = (SQLInSubQueryExpr) obj;
+        if (expr == null) {
+            if (other.expr != null) {
+                return false;
+            }
+        } else if (!expr.equals(other.expr)) {
+            return false;
+        }
+        if (not != other.not) {
+            return false;
+        }
+        if (subQuery == null) {
+            if (other.subQuery != null) {
+                return false;
+            }
+        } else if (!subQuery.equals(other.subQuery)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLIntegerExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLIntegerExpr.java
index ad143c3d02..2c657b04b2 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLIntegerExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLIntegerExpr.java
@@ -49,4 +49,34 @@ public class SQLIntegerExpr extends SQLNumericLiteralExpr {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((number == null) ? 0 : number.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLIntegerExpr other = (SQLIntegerExpr) obj;
+        if (number == null) {
+            if (other.number != null) {
+                return false;
+            }
+        } else if (!number.equals(other.number)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLIntervalLiteralExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLIntervalLiteralExpr.java
index 058a894969..57c5f2483a 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLIntervalLiteralExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLIntervalLiteralExpr.java
@@ -56,4 +56,34 @@ public class SQLIntervalLiteralExpr extends SQLLiteralExpr {
         visitor.endVisit(this);
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((sign == null) ? 0 : sign.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLIntervalLiteralExpr other = (SQLIntervalLiteralExpr) obj;
+        if (sign == null) {
+            if (other.sign != null) {
+                return false;
+            }
+        } else if (!sign.equals(other.sign)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLListExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLListExpr.java
index 65db3a1610..fa0c20b955 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLListExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLListExpr.java
@@ -24,4 +24,35 @@ public class SQLListExpr extends SQLExprImpl {
         }
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((items == null) ? 0 : items.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLListExpr other = (SQLListExpr) obj;
+        if (items == null) {
+            if (other.items != null) {
+                return false;
+            }
+        } else if (!items.equals(other.items)) {
+            return false;
+        }
+        return true;
+    }
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLMethodInvokeExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLMethodInvokeExpr.java
index 21bf99b8ce..2a6e2c2b0e 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLMethodInvokeExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLMethodInvokeExpr.java
@@ -101,4 +101,50 @@ public class SQLMethodInvokeExpr extends SQLExprImpl implements Serializable {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((methodName == null) ? 0 : methodName.hashCode());
+        result = prime * result + ((owner == null) ? 0 : owner.hashCode());
+        result = prime * result + ((parameters == null) ? 0 : parameters.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLMethodInvokeExpr other = (SQLMethodInvokeExpr) obj;
+        if (methodName == null) {
+            if (other.methodName != null) {
+                return false;
+            }
+        } else if (!methodName.equals(other.methodName)) {
+            return false;
+        }
+        if (owner == null) {
+            if (other.owner != null) {
+                return false;
+            }
+        } else if (!owner.equals(other.owner)) {
+            return false;
+        }
+        if (parameters == null) {
+            if (other.parameters != null) {
+                return false;
+            }
+        } else if (!parameters.equals(other.parameters)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNotExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNotExpr.java
index 13a7283da5..7f4fda8df2 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNotExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNotExpr.java
@@ -56,4 +56,34 @@ public class SQLNotExpr extends SQLExprImpl implements Serializable {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((expr == null) ? 0 : expr.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLNotExpr other = (SQLNotExpr) obj;
+        if (expr == null) {
+            if (other.expr != null) {
+                return false;
+            }
+        } else if (!expr.equals(other.expr)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNullExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNullExpr.java
index 21a29a25c1..b7cf24a92b 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNullExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNullExpr.java
@@ -34,4 +34,12 @@ public class SQLNullExpr extends SQLLiteralExpr {
 
         visitor.endVisit(this);
     }
+    
+    public int hashCode() {
+        return 0;
+    }
+    
+    public boolean equals(Object o) {
+        return o instanceof SQLNullExpr;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNumberExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNumberExpr.java
index e319534fbe..32a3efa3b7 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNumberExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNumberExpr.java
@@ -48,4 +48,34 @@ public class SQLNumberExpr extends SQLNumericLiteralExpr {
         visitor.visit(this);
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((number == null) ? 0 : number.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLNumberExpr other = (SQLNumberExpr) obj;
+        if (number == null) {
+            if (other.number != null) {
+                return false;
+            }
+        } else if (!number.equals(other.number)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLObjectCreateExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLObjectCreateExpr.java
index 9669aea53e..64aa4faba4 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLObjectCreateExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLObjectCreateExpr.java
@@ -51,4 +51,42 @@ public class SQLObjectCreateExpr extends SQLExprImpl implements Serializable {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((objType == null) ? 0 : objType.hashCode());
+        result = prime * result + ((paramList == null) ? 0 : paramList.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLObjectCreateExpr other = (SQLObjectCreateExpr) obj;
+        if (objType == null) {
+            if (other.objType != null) {
+                return false;
+            }
+        } else if (!objType.equals(other.objType)) {
+            return false;
+        }
+        if (paramList == null) {
+            if (other.paramList != null) {
+                return false;
+            }
+        } else if (!paramList.equals(other.paramList)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLQueryExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLQueryExpr.java
index 950259fa98..c8cb5ce54e 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLQueryExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLQueryExpr.java
@@ -55,4 +55,34 @@ public class SQLQueryExpr extends SQLExprImpl implements Serializable {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((subQuery == null) ? 0 : subQuery.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLQueryExpr other = (SQLQueryExpr) obj;
+        if (subQuery == null) {
+            if (other.subQuery != null) {
+                return false;
+            }
+        } else if (!subQuery.equals(other.subQuery)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLSomeExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLSomeExpr.java
index f1ce16b486..fd327c3ee0 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLSomeExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLSomeExpr.java
@@ -53,4 +53,34 @@ public class SQLSomeExpr extends SQLExprImpl {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((subQuery == null) ? 0 : subQuery.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLSomeExpr other = (SQLSomeExpr) obj;
+        if (subQuery == null) {
+            if (other.subQuery != null) {
+                return false;
+            }
+        } else if (!subQuery.equals(other.subQuery)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLTextLiteralExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLTextLiteralExpr.java
index 135901db75..d934212db8 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLTextLiteralExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLTextLiteralExpr.java
@@ -37,4 +37,34 @@ public abstract class SQLTextLiteralExpr extends SQLLiteralExpr {
     public void setText(String text) {
         this.text = text;
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((text == null) ? 0 : text.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLTextLiteralExpr other = (SQLTextLiteralExpr) obj;
+        if (text == null) {
+            if (other.text != null) {
+                return false;
+            }
+        } else if (!text.equals(other.text)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLUnaryExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLUnaryExpr.java
index 4da3b0da9b..303c5842a9 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLUnaryExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLUnaryExpr.java
@@ -65,4 +65,38 @@ public class SQLUnaryExpr extends SQLExprImpl implements Serializable {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((expr == null) ? 0 : expr.hashCode());
+        result = prime * result + ((operator == null) ? 0 : operator.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        SQLUnaryExpr other = (SQLUnaryExpr) obj;
+        if (expr == null) {
+            if (other.expr != null) {
+                return false;
+            }
+        } else if (!expr.equals(other.expr)) {
+            return false;
+        }
+        if (operator != other.operator) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlBinaryExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlBinaryExpr.java
index fdf3f1188e..c9e9cdaa94 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlBinaryExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlBinaryExpr.java
@@ -58,4 +58,36 @@ public class MySqlBinaryExpr extends SQLLiteralExpr implements MySqlExpr {
         buf.append(value);
         buf.append('\'');
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        MySqlBinaryExpr other = (MySqlBinaryExpr) obj;
+        if (value == null) {
+            if (other.value != null) {
+                return false;
+            }
+        } else if (!value.equals(other.value)) {
+            return false;
+        }
+        return true;
+    }
+    
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlBooleanExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlBooleanExpr.java
index 3df54b79ea..393d279276 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlBooleanExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlBooleanExpr.java
@@ -56,4 +56,32 @@ public class MySqlBooleanExpr extends SQLLiteralExpr implements MySqlExpr {
         buf.append("x");
         buf.append(value ? "TRUE" : "FALSE");
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + (value ? 1231 : 1237);
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        MySqlBooleanExpr other = (MySqlBooleanExpr) obj;
+        if (value != other.value) {
+            return false;
+        }
+        return true;
+    }
+    
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlExtractExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlExtractExpr.java
index c83fcc100f..0ae7c67344 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlExtractExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlExtractExpr.java
@@ -59,4 +59,38 @@ public class MySqlExtractExpr extends SQLExprImpl implements MySqlExpr {
         mysqlVisitor.endVisit(this);
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((unit == null) ? 0 : unit.hashCode());
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (!(obj instanceof MySqlExtractExpr)) {
+            return false;
+        }
+        MySqlExtractExpr other = (MySqlExtractExpr) obj;
+        if (unit != other.unit) {
+            return false;
+        }
+        if (value == null) {
+            if (other.value != null) {
+                return false;
+            }
+        } else if (!value.equals(other.value)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlIntervalExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlIntervalExpr.java
index 4f5cb76b72..4ceeb6acec 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlIntervalExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlIntervalExpr.java
@@ -61,4 +61,38 @@ public class MySqlIntervalExpr extends SQLExprImpl implements MySqlExpr {
         mysqlVisitor.endVisit(this);
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((unit == null) ? 0 : unit.hashCode());
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        MySqlIntervalExpr other = (MySqlIntervalExpr) obj;
+        if (unit != other.unit) {
+            return false;
+        }
+        if (value == null) {
+            if (other.value != null) {
+                return false;
+            }
+        } else if (!value.equals(other.value)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlMatchAgainstExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlMatchAgainstExpr.java
index 34c6ef1b9c..a19cfd0c6d 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlMatchAgainstExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlMatchAgainstExpr.java
@@ -82,4 +82,47 @@ public class MySqlMatchAgainstExpr extends SQLExprImpl implements MySqlExpr {
         }
         mysqlVisitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((against == null) ? 0 : against.hashCode());
+        result = prime * result + ((columns == null) ? 0 : columns.hashCode());
+        result = prime * result + ((searchModifier == null) ? 0 : searchModifier.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        MySqlMatchAgainstExpr other = (MySqlMatchAgainstExpr) obj;
+        if (against == null) {
+            if (other.against != null) {
+                return false;
+            }
+        } else if (!against.equals(other.against)) {
+            return false;
+        }
+        if (columns == null) {
+            if (other.columns != null) {
+                return false;
+            }
+        } else if (!columns.equals(other.columns)) {
+            return false;
+        }
+        if (searchModifier != other.searchModifier) {
+            return false;
+        }
+        return true;
+    }
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/clause/GroupingSetExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/clause/GroupingSetExpr.java
index 5662f1e157..62c3ee7064 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/clause/GroupingSetExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/clause/GroupingSetExpr.java
@@ -29,4 +29,35 @@ public class GroupingSetExpr extends SQLExprImpl {
         visitor.endVisit(this);
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((parameters == null) ? 0 : parameters.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (!(obj instanceof GroupingSetExpr)) {
+            return false;
+        }
+        GroupingSetExpr other = (GroupingSetExpr) obj;
+        if (parameters == null) {
+            if (other.parameters != null) {
+                return false;
+            }
+        } else if (!parameters.equals(other.parameters)) {
+            return false;
+        }
+        return true;
+    }
+
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryDoubleExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryDoubleExpr.java
index 14fec9b4fb..88e16a7b0a 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryDoubleExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryDoubleExpr.java
@@ -42,4 +42,34 @@ public class OracleBinaryDoubleExpr extends SQLNumericLiteralExpr implements Ora
         visitor.endVisit(this);
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleBinaryDoubleExpr other = (OracleBinaryDoubleExpr) obj;
+        if (value == null) {
+            if (other.value != null) {
+                return false;
+            }
+        } else if (!value.equals(other.value)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryFloatExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryFloatExpr.java
index 2a8108d4fd..d548e6e3b4 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryFloatExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryFloatExpr.java
@@ -42,4 +42,34 @@ public class OracleBinaryFloatExpr extends SQLNumericLiteralExpr implements Orac
         visitor.endVisit(this);
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleBinaryFloatExpr other = (OracleBinaryFloatExpr) obj;
+        if (value == null) {
+            if (other.value != null) {
+                return false;
+            }
+        } else if (!value.equals(other.value)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleCursorExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleCursorExpr.java
index 781406e8df..8cc355ce00 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleCursorExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleCursorExpr.java
@@ -39,4 +39,34 @@ public class OracleCursorExpr extends SQLExprImpl implements OracleExpr {
         }
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((query == null) ? 0 : query.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleCursorExpr other = (OracleCursorExpr) obj;
+        if (query == null) {
+            if (other.query != null) {
+                return false;
+            }
+        } else if (!query.equals(other.query)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleDateExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleDateExpr.java
index fc54914175..559f63544c 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleDateExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleDateExpr.java
@@ -47,4 +47,34 @@ public class OracleDateExpr extends SQLLiteralExpr implements OracleExpr {
         visitor.endVisit(this);
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((literal == null) ? 0 : literal.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleDateExpr other = (OracleDateExpr) obj;
+        if (literal == null) {
+            if (other.literal != null) {
+                return false;
+            }
+        } else if (!literal.equals(other.literal)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleDbLinkExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleDbLinkExpr.java
index db0ad1bce6..69d7768318 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleDbLinkExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleDbLinkExpr.java
@@ -65,4 +65,42 @@ public class OracleDbLinkExpr extends SQLExprImpl implements SQLName, OracleExpr
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((dbLink == null) ? 0 : dbLink.hashCode());
+        result = prime * result + ((expr == null) ? 0 : expr.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleDbLinkExpr other = (OracleDbLinkExpr) obj;
+        if (dbLink == null) {
+            if (other.dbLink != null) {
+                return false;
+            }
+        } else if (!dbLink.equals(other.dbLink)) {
+            return false;
+        }
+        if (expr == null) {
+            if (other.expr != null) {
+                return false;
+            }
+        } else if (!expr.equals(other.expr)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleExtractExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleExtractExpr.java
index fec3988bd4..4a31d97565 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleExtractExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleExtractExpr.java
@@ -66,4 +66,39 @@ public class OracleExtractExpr extends SQLExprImpl implements OracleExpr {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((from == null) ? 0 : from.hashCode());
+        result = prime * result + ((unit == null) ? 0 : unit.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleExtractExpr other = (OracleExtractExpr) obj;
+        if (from == null) {
+            if (other.from != null) {
+                return false;
+            }
+        } else if (!from.equals(other.from)) {
+            return false;
+        }
+        if (unit != other.unit) {
+            return false;
+        }
+        return true;
+    }
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleIntervalExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleIntervalExpr.java
index 56ec98f7e0..cfbcfb4ce7 100755
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleIntervalExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleIntervalExpr.java
@@ -91,4 +91,67 @@ public class OracleIntervalExpr extends SQLLiteralExpr implements OracleExpr {
         visitor.visit(this);
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((factionalSecondsPrecision == null) ? 0 : factionalSecondsPrecision.hashCode());
+        result = prime * result + ((precision == null) ? 0 : precision.hashCode());
+        result = prime * result + ((toFactionalSecondsPrecision == null) ? 0 : toFactionalSecondsPrecision.hashCode());
+        result = prime * result + ((toType == null) ? 0 : toType.hashCode());
+        result = prime * result + ((type == null) ? 0 : type.hashCode());
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleIntervalExpr other = (OracleIntervalExpr) obj;
+        if (factionalSecondsPrecision == null) {
+            if (other.factionalSecondsPrecision != null) {
+                return false;
+            }
+        } else if (!factionalSecondsPrecision.equals(other.factionalSecondsPrecision)) {
+            return false;
+        }
+        if (precision == null) {
+            if (other.precision != null) {
+                return false;
+            }
+        } else if (!precision.equals(other.precision)) {
+            return false;
+        }
+        if (toFactionalSecondsPrecision == null) {
+            if (other.toFactionalSecondsPrecision != null) {
+                return false;
+            }
+        } else if (!toFactionalSecondsPrecision.equals(other.toFactionalSecondsPrecision)) {
+            return false;
+        }
+        if (toType != other.toType) {
+            return false;
+        }
+        if (type != other.type) {
+            return false;
+        }
+        if (value == null) {
+            if (other.value != null) {
+                return false;
+            }
+        } else if (!value.equals(other.value)) {
+            return false;
+        }
+        return true;
+    }
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleIsSetExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleIsSetExpr.java
index dcefc82efd..fc87083eb8 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleIsSetExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleIsSetExpr.java
@@ -38,4 +38,34 @@ public class OracleIsSetExpr extends SQLExprImpl implements OracleExpr {
         }
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((nestedTable == null) ? 0 : nestedTable.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleIsSetExpr other = (OracleIsSetExpr) obj;
+        if (nestedTable == null) {
+            if (other.nestedTable != null) {
+                return false;
+            }
+        } else if (!nestedTable.equals(other.nestedTable)) {
+            return false;
+        }
+        return true;
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleOuterExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleOuterExpr.java
index c8c8ad33d5..3d69fe5abf 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleOuterExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleOuterExpr.java
@@ -59,4 +59,34 @@ public class OracleOuterExpr extends SQLExprImpl implements OracleExpr {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((expr == null) ? 0 : expr.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleOuterExpr other = (OracleOuterExpr) obj;
+        if (expr == null) {
+            if (other.expr != null) {
+                return false;
+            }
+        } else if (!expr.equals(other.expr)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleTimestampExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleTimestampExpr.java
index 38935d006a..ea76b13888 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleTimestampExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleTimestampExpr.java
@@ -55,4 +55,43 @@ public class OracleTimestampExpr extends SQLLiteralExpr implements OracleExpr {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((literal == null) ? 0 : literal.hashCode());
+        result = prime * result + ((timeZone == null) ? 0 : timeZone.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleTimestampExpr other = (OracleTimestampExpr) obj;
+        if (literal == null) {
+            if (other.literal != null) {
+                return false;
+            }
+        } else if (!literal.equals(other.literal)) {
+            return false;
+        }
+        if (timeZone == null) {
+            if (other.timeZone != null) {
+                return false;
+            }
+        } else if (!timeZone.equals(other.timeZone)) {
+            return false;
+        }
+        return true;
+    }
+    
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleTableExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleTableExpr.java
index c77e4ecb3a..d522d5bd7b 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleTableExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleTableExpr.java
@@ -91,4 +91,74 @@ public class OracleTableExpr extends SQLExprImpl {
 
         visitor.endVisit(this);
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((dbLink == null) ? 0 : dbLink.hashCode());
+        result = prime * result + ((partition == null) ? 0 : partition.hashCode());
+        result = prime * result + ((partitionFor == null) ? 0 : partitionFor.hashCode());
+        result = prime * result + ((subPartition == null) ? 0 : subPartition.hashCode());
+        result = prime * result + ((subPartitionFor == null) ? 0 : subPartitionFor.hashCode());
+        result = prime * result + ((table == null) ? 0 : table.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        OracleTableExpr other = (OracleTableExpr) obj;
+        if (dbLink == null) {
+            if (other.dbLink != null) {
+                return false;
+            }
+        } else if (!dbLink.equals(other.dbLink)) {
+            return false;
+        }
+        if (partition == null) {
+            if (other.partition != null) {
+                return false;
+            }
+        } else if (!partition.equals(other.partition)) {
+            return false;
+        }
+        if (partitionFor == null) {
+            if (other.partitionFor != null) {
+                return false;
+            }
+        } else if (!partitionFor.equals(other.partitionFor)) {
+            return false;
+        }
+        if (subPartition == null) {
+            if (other.subPartition != null) {
+                return false;
+            }
+        } else if (!subPartition.equals(other.subPartition)) {
+            return false;
+        }
+        if (subPartitionFor == null) {
+            if (other.subPartitionFor != null) {
+                return false;
+            }
+        } else if (!subPartitionFor.equals(other.subPartitionFor)) {
+            return false;
+        }
+        if (table == null) {
+            if (other.table != null) {
+                return false;
+            }
+        } else if (!table.equals(other.table)) {
+            return false;
+        }
+        return true;
+    }
 }