sandynz commented on pull request #14515:
URL: https://github.com/apache/shardingsphere/pull/14515#issuecomment-1004776690


   There's exception thrown when starting scaling job, e.g.
   `useSSL` duplicated:
   ```
   [elasticjob-1494724844918228-2] o.a.s.e.e.h.g.LogJobErrorHandler - Job 
'1494724844918228' exception occur in job processing
   java.lang.IllegalArgumentException: Duplicate key [useSSL] found.
        at 
com.google.common.base.Preconditions.checkArgument(Preconditions.java:217)
        at com.google.common.base.Splitter$MapSplitter.split(Splitter.java:524)
        at 
org.apache.shardingsphere.infra.config.datasource.url.JdbcUrlParser.parseQueryProperties(JdbcUrlParser.java:91)
        at 
org.apache.shardingsphere.infra.config.datasource.url.JdbcUrlParser.parse(JdbcUrlParser.java:60)
        at 
org.apache.shardingsphere.infra.config.datasource.pool.creator.DataSourceReflection.addDefaultDataSourceProperties(DataSourceReflection.java:153)
        at 
org.apache.shardingsphere.infra.config.datasource.pool.creator.DataSourcePoolCreator.createDataSource(DataSourcePoolCreator.java:82)
        at 
org.apache.shardingsphere.infra.config.datasource.pool.creator.DataSourcePoolCreatorUtil.getDataSource(DataSourcePoolCreatorUtil.java:43)
   ```
   
   `rewriteBatchedStatements` duplicated:
   ```
   Caused by: java.lang.IllegalArgumentException: Duplicate key 
[rewriteBatchedStatements] found.
        at 
com.google.common.base.Preconditions.checkArgument(Preconditions.java:217)
        at com.google.common.base.Splitter$MapSplitter.split(Splitter.java:524)
        at 
org.apache.shardingsphere.infra.config.datasource.url.JdbcUrlParser.parseQueryProperties(JdbcUrlParser.java:91)
        at 
org.apache.shardingsphere.infra.config.datasource.url.JdbcUrlParser.parse(JdbcUrlParser.java:60)
        at 
org.apache.shardingsphere.infra.config.datasource.pool.creator.DataSourceReflection.addDefaultDataSourceProperties(DataSourceReflection.java:153)
        at 
org.apache.shardingsphere.infra.config.datasource.pool.creator.DataSourcePoolCreator.createDataSource(DataSourcePoolCreator.java:82)
        at 
org.apache.shardingsphere.infra.config.datasource.pool.creator.DataSourcePoolCreatorUtil.getDataSource(DataSourcePoolCreatorUtil.java:43)
   ```
   
   `/scaling/jobId/config` generation depends on 
`PipelineDataSourceConfiguration.appendJDBCQueryProperties`, which depends on 
`new JdbcUrlParser().appendQueryProperties`.
   


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