Github user amansinha100 commented on a diff in the pull request: https://github.com/apache/drill/pull/407#discussion_r55561579 --- Diff: exec/java-exec/src/test/java/org/apache/drill/TestUnionAll.java --- @@ -527,6 +532,52 @@ public void testUnionAllRightEmptyJson() throws Exception { .build().run(); } + @Test + public void testUnionAllLeftEmptyJson() throws Exception { --- End diff -- Are there any union-all tests with WHERE 1 = 0 filters on the left and/or right inputs ? If not, could you add such tests ? We should distinguish between a truly empty input vs. one that occurs as a result of a False filter.
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