improved sql parser.

src/main/java/com/alibaba/druid/sql/ast/SQLDataTypeImpl.java

@@ -48,6 +48,11 @@ public class SQLDataTypeImpl extends SQLObjectImpl implements SQLDataType {
         addArgument(new SQLIntegerExpr(precision));
     }
 
+    public SQLDataTypeImpl(String name, SQLExpr arg) {
+        this(name);
+        addArgument(arg);
+    }
+
     public SQLDataTypeImpl(String name, int precision, int scale) {
         this(name);
         addArgument(new SQLIntegerExpr(precision));

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleOutputVisitor.java

@@ -2922,7 +2922,7 @@ public class OracleOutputVisitor extends SQLASTOutputVisitor implements OracleAS
             if (count != 0) {
                 print0(", ");
             }
-            print0(ucase ? "FOREIGHN KEY" : "foreighn key");
+            print0(ucase ? "FOREIGN KEY" : "foreign key");
             count++;
         }
 

src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGOutputVisitor.java

@@ -41,6 +41,7 @@ import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGSelectQueryBlock.Fetc
 import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGSelectQueryBlock.ForClause;
 import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGSelectQueryBlock.WindowClause;
 import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;
+import com.alibaba.druid.util.FnvHash;
 import com.alibaba.druid.util.JdbcConstants;
 
 import java.util.LinkedHashSet;
@@ -453,17 +454,32 @@ public class PGOutputVisitor extends SQLASTOutputVisitor implements PGASTVisitor
     @Override
     public boolean visit(PGTypeCastExpr x) {
         SQLExpr expr = x.getExpr();
+        SQLDataType dataType = x.getDataType();
+
+        if (dataType.nameHashCode64() == FnvHash.Constants.VARBIT) {
+            dataType.accept(this);
+            print(' ');
+            printExpr(expr);
+            return false;
+        }
+
         if (expr != null) {
             if (expr instanceof SQLBinaryOpExpr) {
                 print('(');
                 expr.accept(this);
                 print(')');
+            } else if (expr instanceof PGTypeCastExpr && dataType.getArguments().size() == 0) {
+                dataType.accept(this);
+                print('(');
+                visit((PGTypeCastExpr) expr);
+                print(')');
+                return false;
             } else {
                 expr.accept(this);
             }
         }
         print0("::");
-        x.getDataType().accept(this);
+        dataType.accept(this);
         return false;
     }
 
@@ -1775,7 +1791,7 @@ public class PGOutputVisitor extends SQLASTOutputVisitor implements PGASTVisitor
             if (count != 0) {
                 print0(", ");
             }
-            print0(ucase ? "FOREIGHN KEY" : "foreighn key");
+            print0(ucase ? "FOREIGN KEY" : "foreign key");
             count++;
         }
 

src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java

@@ -27,6 +27,7 @@ import com.alibaba.druid.sql.ast.*;
 import com.alibaba.druid.sql.ast.expr.*;
 import com.alibaba.druid.sql.ast.statement.*;
 import com.alibaba.druid.sql.dialect.oracle.ast.expr.OracleArgumentExpr;
+import com.alibaba.druid.sql.dialect.postgresql.ast.expr.PGTypeCastExpr;
 import com.alibaba.druid.util.FnvHash;
 import com.alibaba.druid.util.JdbcConstants;
 
@@ -1012,6 +1013,19 @@ public class SQLExprParser extends SQLParser {
             } else if (hash_lower == FnvHash.Constants.POSITION
                     && JdbcConstants.MYSQL.equals(dbType)) {
                 return parsePosition();
+            } else if (hash_lower == FnvHash.Constants.INT4 && JdbcConstants.POSTGRESQL.equals(dbType)) {
+                PGTypeCastExpr castExpr = new PGTypeCastExpr();
+                castExpr.setExpr(this.expr());
+                castExpr.setDataType(new SQLDataTypeImpl(methodName));
+                accept(Token.RPAREN);
+                return castExpr;
+            } else if (hash_lower == FnvHash.Constants.VARBIT && JdbcConstants.POSTGRESQL.equals(dbType)) {
+                PGTypeCastExpr castExpr = new PGTypeCastExpr();
+                SQLExpr len = this.primary();
+                castExpr.setDataType(new SQLDataTypeImpl(methodName, len));
+                accept(Token.RPAREN);
+                castExpr.setExpr(this.expr());
+                return castExpr;
             }
             aggMethodName = getAggreateFunction(hash_lower);
         } else if (expr instanceof SQLPropertyExpr) {

src/main/java/com/alibaba/druid/sql/parser/SQLParserFeature.java

@@ -17,6 +17,7 @@ package com.alibaba.druid.sql.parser;
 
 public enum SQLParserFeature {
     KeepInsertValueClauseOriginalString,
+    KeepSelectListOriginalString, // for improved sql parameterized performance
     UseInsertColumnsCache,
     EnableSQLBinaryOpExprGroup,
     OptimizedForParameterized,