improved postgresql sql parser support.

src/main/java/com/alibaba/druid/sql/dialect/postgresql/parser/PGSQLStatementParser.java

@@ -208,6 +208,16 @@ public class PGSQLStatementParser extends SQLStatementParser {
         if (lexer.token() == Token.RETURNING) {
             lexer.nextToken();
             SQLExpr returning = this.exprParser.expr();
+
+            if (lexer.token() == Token.COMMA) {
+                lexer.nextToken();
+                SQLListExpr list = new SQLListExpr();
+                list.addItem(returning);
+
+                this.exprParser.exprList(list.getItems(), list);
+
+                returning = list;
+            }
             stmt.setReturning(returning);
         }
         return stmt;

src/test/java/com/alibaba/druid/bvt/sql/postgresql/PGInsertTest13.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright 1999-2017 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 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.stat.TableStat;
+
+import java.util.List;
+
+public class PGInsertTest13 extends PGTest {
+
+    public void test_0() throws Exception {
+        String sql = "INSERT INTO profile_group_execution(\n" +
+                "     \n" +
+                "     gmt_create, gmt_modified \n" +
+                "    ,\n" +
+                "     \n" +
+                "    group_id, mode, sql, status, count, error_msg, error_code\n" +
+                "   \n" +
+                "   \n" +
+                "    )\n" +
+                "    VALUES (\n" +
+                "     \n" +
+                "         \n" +
+                "    now(), now(), ?, ?, ?, ?, ?, ?, ?\n" +
+                "     \n" +
+                "   \n" +
+                "    )\n" +
+                "    RETURNING\n" +
+                "     \n" +
+                "     \n" +
+                "    id,\n" +
+                "     gmt_create, gmt_modified \n" +
+                "   \n" +
+                "    ,\n" +
+                "     \n" +
+                "    group_id, mode, sql, status, count, error_msg, error_code";
+
+        PGSQLStatementParser parser = new PGSQLStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLStatement stmt = statementList.get(0);
+//        print(statementList);
+
+        assertEquals(1, statementList.size());
+
+        PGSchemaStatVisitor visitor = new PGSchemaStatVisitor();
+        stmt.accept(visitor);
+
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getColumns());
+//        System.out.println("coditions : " + visitor.getConditions());
+
+        assertTrue(visitor.containsTable("profile_group_execution"));
+        assertEquals(9, visitor.getColumns().size());
+//
+//        assertTrue(visitor.getColumns().contains(new TableStat.Column("distributors", "did")));
+//        assertTrue(visitor.getColumns().contains(new TableStat.Column("distributors", "dname")));
+
+        assertEquals("INSERT INTO profile_group_execution\n" +
+                "\t(gmt_create, gmt_modified, group_id, mode, sql\n" +
+                "\t, status, count, error_msg, error_code)\n" +
+                "VALUES (now(), now(), ?, ?, ?\n" +
+                "\t, ?, ?, ?, ?)\n" +
+                "RETURNING (id, gmt_create, gmt_modified, group_id, mode, sql, status, count, error_msg, error_code)", stmt.toString());
+    }
+
+}