Update the sql diagram of SHOW TABLES and SHOW INDEXES (#2890)#2892

Merged

yikeke merged 1 commit intopingcap:release-4.0from ti-srebot:release-4.0-66ddaaaf5a74

Jun 16, 2020

+39-31

Commits on Jun 16, 2020

cherry pick pingcap#2890 to release-4.0

tangenta
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