Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21857#discussion_r204763786
--- Diff: sql/core/src/test/resources/sql-tests/inputs/except-all.sql ---
@@ -0,0 +1,146 @@
+CREATE TEMPORARY VIEW tab1 AS SELECT * FROM VALUES
+ (0),(1),(2),(2),(2),(2),(3),(null),(null) AS tab1(c1) ;
--- End diff --
super nit: need spaces like `(0), (1), (2), (3), ....`
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