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MDEV-17301 Change of COLLATE unnecessarily requires ALGORITHM=COPY

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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.
This commit is contained in:
Eugene Kosov
2019-06-14 12:18:49 +03:00
parent 72d3676fe5
commit 854c219a7f
10 changed files with 379 additions and 82 deletions
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2
sql/sql_string.h
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@ -167,7 +167,7 @@ public:
*/
LEX_CSTRING collation_specific_name() const;
bool encoding_allows_reinterpret_as(CHARSET_INFO *cs) const;
bool encoding_and_order_allow_reinterpret_as(CHARSET_INFO *cs) const;
bool eq_collation_specific_names(CHARSET_INFO *cs) const;
};