refactor sql parser.

src/main/java/com/alibaba/druid/sql/ast/statement/SQLExprTableSource.java

@@ -91,23 +91,20 @@ public class SQLExprTableSource extends SQLTableSourceImpl {
     }
 
     @Override
-    public int hashCode() {
-        final int prime = 31;
-        int result = 1;
-        result = prime * result + ((expr == null) ? 0 : expr.hashCode());
-        return result;
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        SQLExprTableSource that = (SQLExprTableSource) o;
+
+        if (expr != null ? !expr.equals(that.expr) : that.expr != null) return false;
+        return partitions != null ? partitions.equals(that.partitions) : that.partitions == null;
     }
 
     @Override
-    public boolean equals(Object obj) {
-        if (this == obj) return true;
-        if (obj == null) return false;
-        if (getClass() != obj.getClass()) return false;
-        SQLExprTableSource other = (SQLExprTableSource) obj;
-        if (expr == null) {
-            if (other.expr != null) return false;
-        } else if (!expr.equals(other.expr)) return false;
-        return true;
+    public int hashCode() {
+        int result = expr != null ? expr.hashCode() : 0;
+        result = 31 * result + (partitions != null ? partitions.hashCode() : 0);
+        return result;
     }
-
 }

src/main/java/com/alibaba/druid/sql/ast/statement/SQLJoinTableSource.java

@@ -117,6 +117,21 @@ public class SQLJoinTableSource extends SQLTableSourceImpl {
         }
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        SQLJoinTableSource that = (SQLJoinTableSource) o;
+
+        if (natural != that.natural) return false;
+        if (left != null ? !left.equals(that.left) : that.left != null) return false;
+        if (joinType != that.joinType) return false;
+        if (right != null ? !right.equals(that.right) : that.right != null) return false;
+        if (condition != null ? !condition.equals(that.condition) : that.condition != null) return false;
+        return using != null ? using.equals(that.using) : that.using == null;
+    }
+
     public static enum JoinType {
         COMMA(","), //
         JOIN("JOIN"), //

src/main/java/com/alibaba/druid/sql/ast/statement/SQLRollbackStatement.java

@@ -15,6 +15,7 @@
  */
 package com.alibaba.druid.sql.ast.statement;
 
+import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
@@ -22,6 +23,11 @@ import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 public class SQLRollbackStatement extends SQLStatementImpl {
 
     private SQLName to;
+
+    // for mysql
+    private Boolean chain;
+    private Boolean release;
+    private SQLExpr force;
     
     public SQLRollbackStatement() {
         
@@ -35,6 +41,8 @@ public class SQLRollbackStatement extends SQLStatementImpl {
     protected void accept0(SQLASTVisitor visitor) {
         if (visitor.visit(this)) {
             acceptChild(visitor, to);
+
+            acceptChild(visitor, force);
         }
         visitor.endVisit(this);
     }
@@ -47,4 +55,28 @@ public class SQLRollbackStatement extends SQLStatementImpl {
         this.to = to;
     }
 
+    public Boolean getChain() {
+        return chain;
+    }
+
+    public void setChain(Boolean chain) {
+        this.chain = chain;
+    }
+
+    public Boolean getRelease() {
+        return release;
+    }
+
+    public void setRelease(Boolean release) {
+        this.release = release;
+    }
+
+    public SQLExpr getForce() {
+        return force;
+    }
+
+    public void setForce(SQLExpr force) {
+        this.force = force;
+    }
+
 }