improved postgresql support

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

@@ -1658,6 +1658,9 @@ public class SQLStatementParser extends SQLParser {
             item.getColumns().add(columnDef);
             if (lexer.token() == Token.COMMA) {
                 lexer.nextToken();
+                if (identifierEquals("ADD")) {
+                    break;
+                }
                 continue;
             }
             break;

src/test/java/com/alibaba/druid/bvt/sql/postgresql/PGAlterTableTest3.java

@@ -0,0 +1,60 @@
+/*
+ * 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.stat.TableStat;
+
+public class PGAlterTableTest3 extends PGTest {
+
+    public void test_0() throws Exception {
+        String sql = "ALTER TABLE issues "//
+                + "ADD COLUMN issue_creation_date_ms BIGINT NULL, "//
+                + "ADD COLUMN issue_update_date_ms BIGINT NULL, "//
+                + "ADD COLUMN issue_close_date_ms BIGINT NULL, "//
+                + "ADD COLUMN tags VARCHAR (4000) NULL, "//
+                + "ADD COLUMN component_uuid VARCHAR (50) NULL, "//
+                + "ADD COLUMN project_uuid VARCHAR (50) NULL";
+
+        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());
+
+        Assert.assertTrue(visitor.getTables().containsKey(new TableStat.Name("issues")));
+        
+        Assert.assertTrue(visitor.getTables().get(new TableStat.Name("issues")).getAlterCount() == 1);
+
+        Assert.assertEquals(visitor.getColumns().size(), 6);
+    }
+
+   
+}