sql parser improved for postgresql

src/main/java/com/alibaba/druid/sql/ast/expr/SQLTimestampExpr.java

@@ -0,0 +1,93 @@
+package com.alibaba.druid.sql.ast.expr;
+
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLExprImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLTimestampExpr extends SQLExprImpl {
+
+    protected String  literal;
+    protected String  timeZone;
+    protected boolean withTimeZone = false;
+
+    public SQLTimestampExpr(){
+        
+    }
+
+    public String getLiteral() {
+        return literal;
+    }
+
+    public void setLiteral(String literal) {
+        this.literal = literal;
+    }
+
+    public String getTimeZone() {
+        return this.timeZone;
+    }
+
+    public void setTimeZone(String timeZone) {
+        this.timeZone = timeZone;
+    }
+
+    public boolean isWithTimeZone() {
+        return withTimeZone;
+    }
+
+    public void setWithTimeZone(boolean withTimeZone) {
+        this.withTimeZone = withTimeZone;
+    }
+
+    @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());
+        result = prime * result + (withTimeZone ? 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;
+        }
+        SQLTimestampExpr other = (SQLTimestampExpr) 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;
+        }
+        if (withTimeZone != other.withTimeZone) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        visitor.visit(this);
+
+        visitor.endVisit(this);
+    }
+
+    public String toString() {
+        return SQLUtils.toSQLString(this, null);
+    }
+}