Github user nsyca commented on the issue:
https://github.com/apache/spark/pull/15936
The latest push (3181a08) of the PR has the following changes from its
previous version:
1. Consolidate existing checking from Analyzer.scala to CheckAnalysis.scala
2. Make use of `ExpressionSet` class to compare the canonical form of
expressions between two ExpressionSet
3. Revise the test case to be more concise (using only one table) and, more
importantly, exercise the `ExpressionSet` code in the comparison of the columns
in the GROUP BY clause and the columns in the WHERE clause at line 143 of the
file CheckAnalysis.scala
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