0499b2211b
1. Add table function node 2. Add 3 table functions: explode_split, explode_bitmap and explode_json_array
112 lines
2.5 KiB
Markdown
112 lines
2.5 KiB
Markdown
---
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{
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"title": "explode_split",
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"language": "zh-CN"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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# explode_split
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## description
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表函数，需配合 Lateral View 使用。
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将一个字符串按指定的分隔符分割成多个子串。
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语法：
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```
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explode_split(str, delimiter)
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```
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## example
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原表数据：
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```
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mysql> select * from example1 order by k1;
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+------+---------+
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| k1 | k2 |
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+------+---------+
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| 1 | |
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| 2 | NULL |
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| 3 | , |
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| 4 | 1 |
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| 5 | 1,2,3 |
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| 6 | a, b, c |
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+------+---------+
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```
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Lateral View:
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```
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mysql> select k1, e1 from example1 lateral view explode_split(k2, ',') tmp1 as e1 where k1 = 1 order by k1, e1;
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+------+------+
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| k1 | e1 |
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+------+------+
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| 1 | |
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+------+------+
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mysql> select k1, e1 from example1 lateral view explode_split(k2, ',') tmp1 as e1 where k1 = 2 order by k1, e1;
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+------+------+
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| k1 | e1 |
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+------+------+
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| 2 | NULL |
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+------+------+
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mysql> select k1, e1 from example1 lateral view explode_split(k2, ',') tmp1 as e1 where k1 = 3 order by k1, e1;
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+------+------+
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| k1 | e1 |
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+------+------+
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| 3 | |
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| 3 | |
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+------+------+
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mysql> select k1, e1 from example1 lateral view explode_split(k2, ',') tmp1 as e1 where k1 = 4 order by k1, e1;
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+------+------+
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| k1 | e1 |
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+------+------+
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| 4 | 1 |
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+------+------+
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mysql> select k1, e1 from example1 lateral view explode_split(k2, ',') tmp1 as e1 where k1 = 5 order by k1, e1;
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+------+------+
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| k1 | e1 |
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+------+------+
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| 5 | 1 |
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| 5 | 2 |
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| 5 | 3 |
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+------+------+
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mysql> select k1, e1 from example1 lateral view explode_split(k2, ',') tmp1 as e1 where k1 = 6 order by k1, e1;
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+------+------+
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| k1 | e1 |
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+------+------+
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| 6 | b |
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| 6 | c |
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| 6 | a |
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+------+------+
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```
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## keyword
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explode_split |