improved sql parser for postgresql

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

@@ -28,16 +28,25 @@ public class SQLBinaryOpExpr extends SQLExprImpl implements Serializable {
     private SQLExpr           left;
     private SQLExpr           right;
     private SQLBinaryOperator operator;
+    private String            dbType;
 
     public SQLBinaryOpExpr(){
 
     }
 
-    public SQLBinaryOpExpr(SQLExpr left, SQLBinaryOperator operator, SQLExpr right){
+    public SQLBinaryOpExpr(String dbType){
+        this.dbType = dbType;
+    }
 
+    public SQLBinaryOpExpr(SQLExpr left, SQLBinaryOperator operator, SQLExpr right){
+        this(left, operator, right, null);
+    }
+    
+    public SQLBinaryOpExpr(SQLExpr left, SQLBinaryOperator operator, SQLExpr right, String dbType){
         setLeft(left);
         setRight(right);
         this.operator = operator;
+        this.dbType = dbType;
     }
 
     public SQLBinaryOpExpr(SQLExpr left, SQLExpr right, SQLBinaryOperator operator){
@@ -47,6 +56,14 @@ public class SQLBinaryOpExpr extends SQLExprImpl implements Serializable {
         this.operator = operator;
     }
 
+    public String getDbType() {
+        return dbType;
+    }
+
+    public void setDbType(String dbType) {
+        this.dbType = dbType;
+    }
+
     public SQLExpr getLeft() {
         return this.left;
     }
@@ -129,6 +146,6 @@ public class SQLBinaryOpExpr extends SQLExprImpl implements Serializable {
     }
 
     public String toString() {
-        return SQLUtils.toSQLString(this);
+        return SQLUtils.toSQLString(this, getDbType());
     }
 }

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

@@ -117,4 +117,8 @@ public enum SQLBinaryOperator {
                 return false;
         }
     }
+    
+    public boolean isLogical() {
+        return this == BooleanAnd || this == BooleanOr || this == BooleanXor;
+    }
 }

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

@@ -24,7 +24,9 @@ public enum SQLUnaryOperator {
     ConnectByRoot("CONNECT BY"), //
     BINARY("BINARY"), //
     RAW("RAW"), //
-    NOT("NOT");
+    NOT("NOT"),
+    Pound("#") // Number of points in path or polygon
+    ;
 
     public final String name;