improve postgresql support

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

@@ -1652,8 +1652,14 @@ public class SQLExprParser extends SQLParser {
         } else {
             accept(Token.EQ);
         }
-        item.setValue(expr());
-
+        
+        if(lexer.token() == Token.ON) {
+            item.setValue(new SQLIdentifierExpr(lexer.stringVal()));
+            lexer.nextToken();
+        } else {
+            item.setValue(expr());
+        }
+        
         return item;
     }
 

src/main/java/com/alibaba/druid/util/JdbcUtils.java

@@ -123,15 +123,21 @@ public final class JdbcUtils implements JdbcConstants {
     public static void printResultSet(ResultSet rs) throws SQLException {
         printResultSet(rs, System.out);
     }
-
+    
     public static void printResultSet(ResultSet rs, PrintStream out) throws SQLException {
+        printResultSet(rs, out, true, "\t");
+    }
+
+    public static void printResultSet(ResultSet rs, PrintStream out, boolean printHeader, String seperator) throws SQLException {
         ResultSetMetaData metadata = rs.getMetaData();
         int columnCount = metadata.getColumnCount();
-        for (int columnIndex = 1; columnIndex <= columnCount; ++columnIndex) {
-            if (columnIndex != 1) {
-                out.print('\t');
+        if (printHeader) {
+            for (int columnIndex = 1; columnIndex <= columnCount; ++columnIndex) {
+                if (columnIndex != 1) {
+                    out.print(seperator);
+                }
+                out.print(metadata.getColumnName(columnIndex));
             }
-            out.print(metadata.getColumnName(columnIndex));
         }
 
         out.println();
@@ -140,7 +146,7 @@ public final class JdbcUtils implements JdbcConstants {
 
             for (int columnIndex = 1; columnIndex <= columnCount; ++columnIndex) {
                 if (columnIndex != 1) {
-                    out.print('\t');
+                    out.print(seperator);
                 }
 
                 int type = metadata.getColumnType(columnIndex);

src/test/java/com/alibaba/druid/bvt/sql/postgresql/PGSetTest.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.postgresql;
+
+import java.util.List;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.sql.PGTest;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.postgresql.parser.PGSQLStatementParser;
+import com.alibaba.druid.sql.dialect.postgresql.visitor.PGSchemaStatVisitor;
+import com.alibaba.druid.sql.visitor.ParameterizedOutputVisitorUtils;
+import com.alibaba.druid.util.JdbcUtils;
+
+public class PGSetTest extends PGTest {
+
+    protected void setUp() throws Exception {
+        super.setUp();
+
+        System.out.println();
+    }
+
+    public void test_0() throws Exception {
+        String sql = "SET standard_conforming_strings=on";
+
+        PGSQLStatementParser parser = new PGSQLStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLStatement statemen = statementList.get(0);
+        print(statementList);
+
+        Assert.assertEquals(1, statementList.size());
+
+        PGSchemaStatVisitor visitor = new PGSchemaStatVisitor();
+        statemen.accept(visitor);
+        //
+        // System.out.println("Tables : " + visitor.getTables());
+        // System.out.println("fields : " + visitor.getColumns());
+        // System.out.println("coditions : " + visitor.getConditions());
+
+        Assert.assertEquals(1, visitor.getColumns().size());
+
+        String mergedSql = ParameterizedOutputVisitorUtils.parameterize(sql, JdbcUtils.POSTGRESQL);
+        System.out.println(mergedSql);
+    }
+
+}
+
+// select categoryId , offerIds from cnres.function_select_get_spt_p4p_offer_list (' 1031918 , 1031919 , 1037004 ') as
+// a(categoryId numeric,offerIds character varying(4000))
+// select memberId , offerIds from cnres.function_select_get_seller_hot_offer_list('\'gzyyd168\'') as a(memberId
+// character varying(20),offerIds character varying(4000))
+