Eugene Kosov 854c219a7f MDEV-17301 Change of COLLATE unnecessarily requires ALGORITHM=COPY ...

Patch is about two cases:
1) On some collate changes it's possible to rebuild only secondary indexes
2) For non-indexed columns collate can be changed INSTANTly

Implemented mostly in Field_{string,varstring,blob}::is_equal().
Make this method return how exactly collationa differs.
This information is later used by fill_alter_inplace_info() to pass
correct info to engine.

2019-06-22 14:09:12 +03:00

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