70 lines
2.0 KiB
Markdown
70 lines
2.0 KiB
Markdown
---
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{
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"title": "CANCEL ALTER",
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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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# CANCEL ALTER
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## description
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该语句用于撤销一个 ALTER 操作。
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1. 撤销 ALTER TABLE COLUMN 操作
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语法：
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CANCEL ALTER TABLE COLUMN
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FROM db_name.table_name
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2. 撤销 ALTER TABLE ROLLUP 操作
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语法：
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CANCEL ALTER TABLE ROLLUP
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FROM db_name.table_name
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3. 根据job id批量撤销rollup操作
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语法:
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CANCEL ALTER TABLE ROLLUP
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FROM db_name.table_name (jobid,...)
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注意：
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该命令为异步操作，具体是否执行成功需要使用`show alter table rollup`查看任务状态确认
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4. 撤销 ALTER CLUSTER 操作
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语法：
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（待实现...）
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## example
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[CANCEL ALTER TABLE COLUMN]
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1. 撤销针对 my_table 的 ALTER COLUMN 操作。
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CANCEL ALTER TABLE COLUMN
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FROM example_db.my_table;
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[CANCEL ALTER TABLE ROLLUP]
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1. 撤销 my_table 下的 ADD ROLLUP 操作。
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CANCEL ALTER TABLE ROLLUP
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FROM example_db.my_table;
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[CANCEL ALTER TABLE ROLLUP]
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1. 根据job id撤销 my_table 下的 ADD ROLLUP 操作。
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CANCEL ALTER TABLE ROLLUP
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FROM example_db.my_table (12801,12802);
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## keyword
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CANCEL,ALTER,TABLE,COLUMN,ROLLUP
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