1388a469b1
This should gives us better analysis time error messages (rather than runtime) and automatic type casting.
Author: Reynold Xin <rxin@databricks.com>
Closes #5796 from rxin/expected-input-types and squashes the following commits:
c900760 [Reynold Xin] [SPARK-7266] Add ExpectsInputTypes to expressions when possible.
(cherry picked from commit
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