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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