fix parse JsonBinary type column blank holes error caused by MySql 8.0#302

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johnyang007 wants to merge 3 commits intoshyiko:masterfrom johnyang007:master

+240-41

Commits on Oct 21, 2019

fix parse JsonBinary type column blank holes error caused by MySql 8.0 partial update performance
yangkun
committed

Commits on Oct 22, 2019

revert compiler level from 8 to 1.6
yangkun
committed

Commits on Oct 23, 2019

add integration test for mysql 8.0 json partial update
yangkun
committed