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MDEV-7318 RENAME INDEX

Browse Source 
This patch adds support of RENAME INDEX operation to the ALTER TABLE
statement. Code which determines if ALTER TABLE can be done in-place
for "simple" storage engines like MyISAM, Heap and etc. was updated to
handle ALTER TABLE ... RENAME INDEX as an in-place operation. Support
for in-place ALTER TABLE ... RENAME INDEX for InnoDB was covered by
MDEV-13301.

Syntax changes
==============

A new type of <alter_specification> is added:

<rename index clause> ::= RENAME ( INDEX | KEY ) <oldname> TO <newname>

Where <oldname> and <newname> are identifiers for old name and new
name of the index.

Semantic changes
================

The result of "ALTER TABLE t1 RENAME INDEX a TO b" is a table which
contents and structure are identical to the old version of 't1' with
the only exception index 'a' being called 'b'.

Neither <oldname> nor <newname> can be "primary". The index being
renamed should exist and its new name should not be occupied
by another index on the same table.

Related to: WL#6555, MDEV-13301
This commit is contained in:
Aleksey Midenkov
2020-03-03 13:50:33 +03:00
parent fa8ad75439
commit 193725b81e
13 changed files with 2204 additions and 2 deletions
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4
sql/sql_alter.h
View File

@ -19,6 +19,7 @@
class Alter_drop;
class Alter_column;
class Alter_rename_key;
class Key;
/**
@ -87,6 +88,8 @@ public:
List<Alter_column> alter_list;
// List of keys, used by both CREATE and ALTER TABLE.
List<Key> key_list;
// List of keys to be renamed.
List<Alter_rename_key> alter_rename_key_list;
// List of columns, used by both CREATE and ALTER TABLE.
List<Create_field> create_list;
@ -123,6 +126,7 @@ public:
drop_list.empty();
alter_list.empty();
key_list.empty();
alter_rename_key_list.empty();
create_list.empty();
check_constraint_list.empty();
flags= 0;