[PR] Support parsing MySQL LOAD DATA with @ variable [shardingsphere]

["TherChenYang (via GitHub)" <gi...@apache.org>]

TherChenYang opened a new pull request, #31142:
URL: https://github.com/apache/shardingsphere/pull/31142

   Fixes #ISSUSE_ID.
   
   Changes proposed in this pull request:
     - Support parsing MySQL LOAD DATA with @ variable
   
   SQL Case
   ```sql
   LOAD DATA INFILE 'file.txt'
     INTO TABLE t1
     (column1, @var1)
     SET column2 = @var1/100;
   ```
   
   ```sql
   LOAD DATA INFILE 'file.txt'
     INTO TABLE t1
     (column1, @dummy, column2, @dummy, column3);
   ```
   
   ```sql
   EXECUTE STMT USING @skip, @numrows;
   ```
   
   ---
   
   Before committing this PR, I'm sure that I have checked the following options:
   - [x] My code follows the [code of conduct](https://shardingsphere.apache.org/community/en/involved/conduct/code/) of this project.
   - [x] I have self-reviewed the commit code.
   - [x] I have (or in comment I request) added corresponding labels for the pull request.
   - [x] I have passed maven check locally : `./mvnw clean install -B -T1C -Dmaven.javadoc.skip -Dmaven.jacoco.skip -e`.
   - [ ] I have made corresponding changes to the documentation.
   - [x] I have added corresponding unit tests for my changes.
   


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Re: [PR] Support parsing MySQL LOAD DATA with @ variable [shardingsphere]

["strongduanmu (via GitHub)" <gi...@apache.org>]

strongduanmu merged PR #31142:
URL: https://github.com/apache/shardingsphere/pull/31142


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