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Commit b72e01e8 authored by gatorsmile's avatar gatorsmile Committed by Cheng Lian
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[SPARK-12867][SQL] Nullability of Intersect can be stricter 

JIRA: https://issues.apache.org/jira/browse/SPARK-12867

When intersecting one nullable column with one non-nullable column, the result will not contain any null. Thus, we can make nullability of `intersect` stricter.

liancheng Could you please check if the code changes are appropriate? Also added test cases to verify the results. Thanks!

Author: gatorsmile <gatorsmile@gmail.com>

Closes #10812 from gatorsmile/nullabilityIntersect.
parent 2388de51
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