expression, types: fix `str_to_date` func compatible (#9819)#9964

Merged

zz-jason merged 1 commit intopingcap:release-2.1from b41sh:str_to_date-cherrypick-2.1

Apr 1, 2019

+6

Commits on Mar 31, 2019

fix str_to_date func compatible issues 9773 (pingcap#9819 )
b41sh
committed