Jesus Camacho Rodriguez commented on HIVE-14957:

Thanks [~pxiong], patch LGTM, that should fix the issue. I think we should add 
a test case that reproduces the issue to verify that it works properly.

Btw, this should probably be backported at least to 2.1.0.

> HiveSortLimitPullUpConstantsRule misses branches when parent operator is Union
> ------------------------------------------------------------------------------
>                 Key: HIVE-14957
>                 URL: https://issues.apache.org/jira/browse/HIVE-14957
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-14957.01.patch, HIVE-14957.02.patch
> {code}
> call.transformTo(parent.copy(parent.getTraitSet(), 
> ImmutableList.of(relBuilder.build())));
> {code}
> When parent is an union operator which has 2 inputs, the parent.copy will 
> only copy the one that has SortLimit and ignore the other branches.

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