Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/1071#discussion_r158164670
--- Diff:
exec/java-exec/src/test/java/org/apache/drill/TestUnionDistinct.java ---
@@ -754,4 +756,37 @@ public void testDrill4147_1() throws Exception {
}
}
+ @Test
+ public void testUnionWithManyColumns() throws Exception {
--- End diff --
Why would a UNION operator need code for a generated hash table? The union
matches columns, then iterates over multiple result sets. Where would a
run-time hash table fit?
Do we need a different unit test that exercises the hash table code?
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