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MDEV-7317: Make an index ignorable to the optimizer

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This feature adds the functionality of ignorability for indexes.
Indexes are not ignored be default.

To control index ignorability explicitly for a new index,
use IGNORE or NOT IGNORE as part of the index definition for
CREATE TABLE, CREATE INDEX, or ALTER TABLE.

Primary keys (explicit or implicit) cannot be made ignorable.

The table INFORMATION_SCHEMA.STATISTICS get a new column named IGNORED that
would store whether an index needs to be ignored or not.
This commit is contained in:
Varun Gupta
2021-02-25 19:59:51 +05:30
parent 71d30d01aa
commit f691d9865b
108 changed files with 2541 additions and 1422 deletions
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6
sql/handler.cc
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@ -110,7 +110,7 @@ static handlerton *installed_htons[128];
#define BITMAP_STACKBUF_SIZE (128/8)
KEY_CREATE_INFO default_key_create_info=
{ HA_KEY_ALG_UNDEF, 0, 0, {NullS, 0}, {NullS, 0}, true };
{ HA_KEY_ALG_UNDEF, 0, 0, {NullS, 0}, {NullS, 0}, true, false };
/* number of entries in handlertons[] */
ulong total_ha= 0;
@ -4885,7 +4885,8 @@ handler::check_if_supported_inplace_alter(TABLE *altered_table,
ALTER_PARTITIONED |
ALTER_VIRTUAL_GCOL_EXPR |
ALTER_RENAME |
ALTER_RENAME_INDEX;
ALTER_RENAME_INDEX |
ALTER_INDEX_IGNORABILITY;
/* Is there at least one operation that requires copy algorithm? */
if (ha_alter_info->handler_flags & ~inplace_offline_operations)
@ -4933,6 +4934,7 @@ Alter_inplace_info::Alter_inplace_info(HA_CREATE_INFO *create_info_arg,
index_drop_buffer(nullptr),
index_add_count(0),
index_add_buffer(nullptr),
index_altered_ignorability_count(0),
rename_keys(current_thd->mem_root),
handler_ctx(nullptr),
group_commit_ctx(nullptr),