expression: return null when cast to huge binary type (#8768)#9349

Merged

zimulala merged 1 commit intopingcap:release-2.1from eurekaka:cast_binary_21

Feb 19, 2019

+65-18

Commits on Feb 19, 2019

expression: return null when cast to huge binary type (pingcap#8768 )
eurekaka
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