add test case for push down on left outer join

regression-test/suites/join/ddl/left_outer_left_table.sql

@@ -0,0 +1,11 @@
+CREATE TABLE left_outer_left_table (
+  `k1` varchar(200) NULL COMMENT ""
+) ENGINE=OLAP
+UNIQUE KEY(`k1`)
+COMMENT "olap"
+DISTRIBUTED BY HASH(`k1`) BUCKETS 20
+PROPERTIES (
+"in_memory" = "false",
+"storage_format" = "V2",
+"replication_num" = "1"
+);

regression-test/suites/join/ddl/left_outer_right_table.sql

@@ -0,0 +1,11 @@
+CREATE TABLE left_outer_right_table (
+  `k2` varchar(100) NULL COMMENT ""
+) ENGINE=OLAP
+UNIQUE KEY(`k2`)
+COMMENT "olap"
+DISTRIBUTED BY HASH(`k2`) BUCKETS 20
+PROPERTIES (
+"in_memory" = "false",
+"storage_format" = "V2",
+"replication_num" = "1"
+);

regression-test/suites/join/left_outer_join_explain.groovy

@@ -0,0 +1,9 @@
+suite("explain_action", "demo") {
+    explain {
+        sql("select k2 from left_outer_left_table a left outer join left_outer_right_table b on b.k2 = a.k1 where a.k1='uuid'")
+
+        // contains("OUTPUT EXPRS:<slot 0> 100\n") && contains("PARTITION: UNPARTITIONED\n")
+        contains "OUTPUT EXPRS:<slot 0> 100\n"
+        contains "PARTITION: UNPARTITIONED\n"
+    }
+} 

regression-test/suites/join/load.groovy

@@ -0,0 +1,32 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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.
+
+// The cases is copied from https://github.com/trinodb/trino/tree/master
+// /testing/trino-product-tests/src/main/resources/sql-tests/testcases
+// and modified by Doris.
+
+suite("load") {
+    def tables=["left_outer_right_table", "left_outer_left_table"]
+
+    for (String table in tables) {
+        sql """ DROP TABLE IF EXISTS $table """
+    }
+
+    for (String table in tables) {
+        sql new File("""${context.file.parent}/ddl/${table}.sql""").text
+    }
+}

regression-test/suites/join/sql/left_outer_join_explain.sql

@@ -0,0 +1 @@
+explain select k2 from left_outer_left_table a left outer join left_outer_right_table b on b.k2 = a.k1 where a.k1='uuid'