cedbed67be
## Use Case
mysql> CREATE TABLE t_user (
-> event_day DATE,
-> id bigint,
-> username varchar(20)
-> )
-> DISTRIBUTED BY HASH(id) BUCKETS 10
-> PROPERTIES ('replication_num' = '1');
Query OK, 0 rows affected (0.07 sec)
mysql> CREATE TABLE t_user_pv(
-> event_day DATE,
-> id bigint,
-> pv bigint
-> )
-> DISTRIBUTED BY HASH(id) BUCKETS 10
-> PROPERTIES ('replication_num' = '1');
Query OK, 0 rows affected (0.09 sec)
mysql> CREATE MATERIALIZED VIEW mv
-> BUILD IMMEDIATE REFRESH COMPLETE
-> START WITH "2022-10-27 19:35:00"
-> NEXT 1 SECOND
-> KEY (username)
-> DISTRIBUTED BY HASH(username) BUCKETS 10
-> PROPERTIES ('replication_num' = '1')
-> AS SELECT t1.username ,t2.pv FROM t_user t1 LEFT JOIN t_user_pv t2 on t1.id = t2.id;
Query OK, 0 rows affected (0.10 sec)
mysql> DESC mv;
+----------+-------------+------+-------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------+------+-------+---------+-------+
| username | VARCHAR(20) | Yes | true | NULL | |
| pv | BIGINT | Yes | false | NULL | NONE |
+----------+-------------+------+-------+---------+-------+
2 rows in set (0.02 sec)
# 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. # fe-common This module is used to store some common classes of other modules. # spark-dpp This module is Spark DPP program, used for Spark Load function. Depends: fe-common # fe-core This module is the main process module of FE. Depends: fe-common, spark-dpp