[GitHub] [hive] dengzhhu653 commented on a change in pull request #2145: HIVE-24969: Predicates may be removed when decorrelating subqueries with lateral

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dengzhhu653 commented on a change in pull request #2145:
URL: https://github.com/apache/hive/pull/2145#discussion_r680428112



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File path: ql/src/test/results/clientpositive/llap/lateral_left_semi_join.q.out
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@@ -0,0 +1,305 @@
+Warning: Shuffle Join MERGEJOIN[54][tables = [sq_1_notin_nullcheck]] in Stage 'Reducer 3' is a cross product

Review comment:
       One of the parent of `Reducer 3` is a union work(alias `T`), when CrossProductHandler [analyzes](https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/CrossProductHandler.java#L280-L289) the union work, as `work.getAllRootOperators()` returns an empty set, so the inputs of  `t` and `lv` do not added to the reduce sink info of the join, cause the waring message missing some table aliases. 




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