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MDEV-16849 Extending indexed VARCHAR column should be instantaneous

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Analysis:
========
Increasing the length of the indexed varchar column is not an instant operation for
innodb.

Fix:
===
- Introduce the new handler flag 'Alter_inplace_info::ALTER_COLUMN_INDEX_LENGTH' to
indicate the index length differs due to change of column length changes.

- InnoDB makes the ALTER_COLUMN_INDEX_LENGTH flag as instant operation.

This is a port of Mysql fix.

    commit 913071c0b16cc03e703308250d795bc381627e37
    Author: Nisha Gopalakrishnan <nisha.gopalakrishnan@oracle.com>
    Date:   Wed May 30 14:54:46 2018 +0530

        BUG#26848813: INDEXED COLUMN CAN'T BE CHANGED FROM VARCHAR(15)
                      TO VARCHAR(40) INSTANTANEOUSLY
This commit is contained in:
Thirunarayanan Balathandayuthapani
2019-01-30 15:32:51 +05:30
parent 97930df13c
commit b8aef87221
5 changed files with 834 additions and 12 deletions
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5
sql/handler.h
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@@ -2001,6 +2001,11 @@ public:
static const HA_ALTER_FLAGS ALTER_DROP_CHECK_CONSTRAINT= 1ULL << 40;
/**
Change in index length such that it doesn't require index rebuild.
*/
static const HA_ALTER_FLAGS ALTER_COLUMN_INDEX_LENGTH= 1ULL << 41;
/**
Create options (like MAX_ROWS) for the new version of table.