EmmyMiao87 opened a new issue #2155: Push down predicate when equal join predicate is null safe URL: https://github.com/apache/incubator-doris/issues/2155 **Is your feature request related to a problem? Please describe.** The hash join will push down a In predicate to the left child when plan is executed. This is a optimization which avoid to scan the total data in left child. However, if there is null in left child, the in predicate will filter it while the '<=>' operator need it. So, if there are null-safe equal join predicates in hash join, this optimization has been cancelled. **Describe the solution you'd like** This optimization should be effective for null-safe hash join too. The predicate which is used to pushed down should be change to `in or isnull()`
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