mysql-compatibility: update ZERO_DATE docs (#5154) #5233
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TomShawn
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Dec 31, 2020
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cherry-pick #5154 to release-5.0
What is changed, added or deleted? (Required)
The behavior of zero_date changed in master to be more mysql compatibility. This has not been backported.
There are some minor exceptions still, since DDL changes can still produce invalid dates (see: pingcap/tidb#21564 ). But I think these are minor, and it is worth updating the docs since the main workflow as described (INSERT/UPDATE) now matches MySQL.
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