[SPARK-17271] [SQL] Remove redundant semanticEquals() from SortOrder
#14910
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ok to test |
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LGTM |
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Test build #64760 has finished for PR 14910 at commit
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thanks, merging to master! |
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## What changes were proposed in this pull request? Ports #14841 and #14910 from `master` to `branch-2.0` Jira : https://issues.apache.org/jira/browse/SPARK-17271 Planner is adding un-needed SORT operation due to bug in the way comparison for `SortOrder` is done at https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/EnsureRequirements.scala#L253 `SortOrder` needs to be compared semantically because `Expression` within two `SortOrder` can be "semantically equal" but not literally equal objects. eg. In case of `sql("SELECT * FROM table1 a JOIN table2 b ON a.col1=b.col1")` Expression in required SortOrder: ``` AttributeReference( name = "col1", dataType = LongType, nullable = false ) (exprId = exprId, qualifier = Some("a") ) ``` Expression in child SortOrder: ``` AttributeReference( name = "col1", dataType = LongType, nullable = false ) (exprId = exprId) ``` Notice that the output column has a qualifier but the child attribute does not but the inherent expression is the same and hence in this case we can say that the child satisfies the required sort order. This PR includes following changes: - Added a `semanticEquals` method to `SortOrder` so that it can compare underlying child expressions semantically (and not using default Object.equals) - Fixed `EnsureRequirements` to use semantic comparison of SortOrder ## How was this patch tested? - Added a test case to `PlannerSuite`. Ran rest tests in `PlannerSuite` Author: Tejas Patil <tejasp@fb.com> Closes #14920 from tejasapatil/SPARK-17271_2.0_port.
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What changes were proposed in this pull request?
Removing
semanticEquals()fromSortOrderbecause it can use thesemanticEquals()provided by its parent class (Expression). This was as per suggestion by @cloud-fan at https://github.com/apache/spark/pull/14841/files/7192418b3a26a14642fc04fc92bf496a954ffa5d#r77106801How was this patch tested?
Ran the test added in #14841