Github user nsyca commented on a diff in the pull request: https://github.com/apache/spark/pull/16337#discussion_r93817165 --- Diff: sql/core/src/test/resources/sql-tests/inputs/subquery/in-subquery/in-group-by.sql --- @@ -0,0 +1,117 @@ +-- A test suite for GROUP BY in parent side, subquery, and both predicate subquery +-- It includes correlated cases. + +-- tables and data types + +CREATE DATABASE indb; --- End diff -- The statement CREATE DATABASE/DROP DATABASE is used to isolate all the objects created in this test file to its own database/schema. The purpose is to protect any name collision from other test files leaving objects of the same names without properly dropping them. The use of different database/schema mitigates this problem as the chance of having the same database/schema name in two different test files is low.
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