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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2019/08/09 05:58:47 UTC

[GitHub] [incubator-shardingsphere] tristaZero opened a new issue #2715: Optimization of `DISTINCT` SQL.

tristaZero opened a new issue #2715: Optimization of `DISTINCT` SQL.
URL: https://github.com/apache/incubator-shardingsphere/issues/2715
 
 
   ### Optimization of `DISTINCT` SQL.
   
   - [x] Fix bug: can not execute`select distinct t_order.order_id from t_order;`
   - [x] Support to use `select distinct t_order.*, t_order_item.order_id from t_order, t_order_item where t_order.order_id = t_order_item.order_id`
   > when there is `*` in sql, we need to get exact columns from shardingMetadata.
   - [x] Add integrated test cases of `distinct` SQL to cover SQLS mentioned above.
   - [x] Instead of `columnLabelAndIndexMap`, use `QueryResultMetaData` for DistinctQueryResult
   - [x] Instead of `TreeMap`, we should consider to use `HashMultimap` for QueryResultMetaData

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