PG SQL Parser support merge into statement

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

@@ -73,6 +73,9 @@ public class PGLexer extends Lexer {
         map.put("TYPE", Token.TYPE);
         map.put("ILIKE", Token.ILIKE);
 
+        map.put("MERGE", Token.MERGE);
+        map.put("MATCHED", Token.MATCHED);
+
         DEFAULT_PG_KEYWORDS = new Keywords(map);
     }
 

src/test/java/com/alibaba/druid/bvt/sql/postgresql/PGMergeIntoTest0.java

@@ -0,0 +1,68 @@
+/*
+ * 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 PGMergeIntoTest0 extends PGTest {
+
+    public void test_0() throws Exception {
+        String sql = "MERGE INTO CustomerAccount CA  \n" +
+                "USING (Select CustomerId, TransactionValue From RecentTransactions) AS T  \n" +
+                "ON CA.CustomerId = T.CustomerId  \n" +
+                "WHEN NOT MATCHED THEN  \n" +
+                "  INSERT (CustomerId, Balance)  \n" +
+                "  VALUES (T.CustomerId, T.TransactionValue)  \n" +
+                "WHEN MATCHED THEN  \n" +
+                "  UPDATE SET Balance = Balance + TransactionValue;  ";
+
+        PGSQLStatementParser parser = new PGSQLStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLStatement stmt = statementList.get(0);
+
+        assertEquals("MERGE INTO CustomerAccount CA\n" +
+                "USING (\n" +
+                "\t(SELECT CustomerId, TransactionValue\n" +
+                "\tFROM RecentTransactions)\n" +
+                ") T ON (CA.CustomerId = T.CustomerId) \n" +
+                "WHEN MATCHED THEN UPDATE SET Balance = Balance + TransactionValue\n" +
+                "WHEN NOT MATCHED THEN INSERT (CustomerId, Balance) VALUES (T.CustomerId, T.TransactionValue);", stmt.toString());
+
+        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.getTables().containsKey(new TableStat.Name("student")));
+//
+//        assertEquals(2, visitor.getColumns().size() );
+//
+//        assertTrue(visitor.containsColumn("student", "id"));
+//        assertTrue(visitor.containsColumn("student", "grade"));
+    }
+
+    
+}