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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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60
mysql-test/main/stat_tables_innodb.result
View File

@ -186,10 +186,10 @@ select count(distinct o_custkey) from orders;
count(distinct o_custkey)
100
show index from orders;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
orders 0 PRIMARY 1 o_orderkey A 1500 NULL NULL BTREE
orders 1 i_o_orderdate 1 o_orderDATE A 1126 NULL NULL YES BTREE
orders 1 i_o_custkey 1 o_custkey A 100 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
orders 0 PRIMARY 1 o_orderkey A 1500 NULL NULL BTREE NO
orders 1 i_o_orderdate 1 o_orderDATE A 1126 NULL NULL YES BTREE NO
orders 1 i_o_custkey 1 o_custkey A 100 NULL NULL YES BTREE NO
select index_name, column_name, cardinality from information_schema.statistics
where table_name='orders';
index_name column_name cardinality
@ -688,33 +688,33 @@ dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
dbt3_s001 lineitem i_l_commitdate 1 2.7160
SHOW INDEXES FROM lineitem;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
lineitem 0 PRIMARY 1 l_orderkey A 1500 NULL NULL BTREE
lineitem 0 PRIMARY 2 l_linenumber A 6005 NULL NULL BTREE
lineitem 1 i_l_shipdate 1 l_shipDATE A 2266 NULL NULL YES BTREE
lineitem 1 i_l_suppkey_partkey 1 l_partkey A 200 NULL NULL YES BTREE
lineitem 1 i_l_suppkey_partkey 2 l_suppkey A 699 NULL NULL YES BTREE
lineitem 1 i_l_partkey 1 l_partkey A 200 NULL NULL YES BTREE
lineitem 1 i_l_suppkey 1 l_suppkey A 10 NULL NULL YES BTREE
lineitem 1 i_l_receiptdate 1 l_receiptDATE A 2268 NULL NULL YES BTREE
lineitem 1 i_l_orderkey 1 l_orderkey A 1500 NULL NULL BTREE
lineitem 1 i_l_orderkey_quantity 1 l_orderkey A 1500 NULL NULL BTREE
lineitem 1 i_l_orderkey_quantity 2 l_quantity A 5771 NULL NULL YES BTREE
lineitem 1 i_l_commitdate 1 l_commitDATE A 2210 NULL NULL YES BTREE
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
lineitem 0 PRIMARY 1 l_orderkey A 1500 NULL NULL BTREE NO
lineitem 0 PRIMARY 2 l_linenumber A 6005 NULL NULL BTREE NO
lineitem 1 i_l_shipdate 1 l_shipDATE A 2266 NULL NULL YES BTREE NO
lineitem 1 i_l_suppkey_partkey 1 l_partkey A 200 NULL NULL YES BTREE NO
lineitem 1 i_l_suppkey_partkey 2 l_suppkey A 699 NULL NULL YES BTREE NO
lineitem 1 i_l_partkey 1 l_partkey A 200 NULL NULL YES BTREE NO
lineitem 1 i_l_suppkey 1 l_suppkey A 10 NULL NULL YES BTREE NO
lineitem 1 i_l_receiptdate 1 l_receiptDATE A 2268 NULL NULL YES BTREE NO
lineitem 1 i_l_orderkey 1 l_orderkey A 1500 NULL NULL BTREE NO
lineitem 1 i_l_orderkey_quantity 1 l_orderkey A 1500 NULL NULL BTREE NO
lineitem 1 i_l_orderkey_quantity 2 l_quantity A 5771 NULL NULL YES BTREE NO
lineitem 1 i_l_commitdate 1 l_commitDATE A 2210 NULL NULL YES BTREE NO
SELECT * FROM INFORMATION_SCHEMA.STATISTICS WHERE table_name='lineitem';
TABLE_CATALOG TABLE_SCHEMA TABLE_NAME NON_UNIQUE INDEX_SCHEMA INDEX_NAME SEQ_IN_INDEX COLUMN_NAME COLLATION CARDINALITY SUB_PART PACKED NULLABLE INDEX_TYPE COMMENT INDEX_COMMENT
def dbt3_s001 lineitem 0 dbt3_s001 PRIMARY 1 l_orderkey A 1500 NULL NULL BTREE
def dbt3_s001 lineitem 0 dbt3_s001 PRIMARY 2 l_linenumber A 6005 NULL NULL BTREE
def dbt3_s001 lineitem 1 dbt3_s001 i_l_shipdate 1 l_shipDATE A 2266 NULL NULL YES BTREE
def dbt3_s001 lineitem 1 dbt3_s001 i_l_suppkey_partkey 1 l_partkey A 200 NULL NULL YES BTREE
def dbt3_s001 lineitem 1 dbt3_s001 i_l_suppkey_partkey 2 l_suppkey A 699 NULL NULL YES BTREE
def dbt3_s001 lineitem 1 dbt3_s001 i_l_partkey 1 l_partkey A 200 NULL NULL YES BTREE
def dbt3_s001 lineitem 1 dbt3_s001 i_l_suppkey 1 l_suppkey A 10 NULL NULL YES BTREE
def dbt3_s001 lineitem 1 dbt3_s001 i_l_receiptdate 1 l_receiptDATE A 2268 NULL NULL YES BTREE
def dbt3_s001 lineitem 1 dbt3_s001 i_l_orderkey 1 l_orderkey A 1500 NULL NULL BTREE
def dbt3_s001 lineitem 1 dbt3_s001 i_l_orderkey_quantity 1 l_orderkey A 1500 NULL NULL BTREE
def dbt3_s001 lineitem 1 dbt3_s001 i_l_orderkey_quantity 2 l_quantity A 5771 NULL NULL YES BTREE
def dbt3_s001 lineitem 1 dbt3_s001 i_l_commitdate 1 l_commitDATE A 2210 NULL NULL YES BTREE
TABLE_CATALOG TABLE_SCHEMA TABLE_NAME NON_UNIQUE INDEX_SCHEMA INDEX_NAME SEQ_IN_INDEX COLUMN_NAME COLLATION CARDINALITY SUB_PART PACKED NULLABLE INDEX_TYPE COMMENT INDEX_COMMENT IGNORED
def dbt3_s001 lineitem 0 dbt3_s001 PRIMARY 1 l_orderkey A 1500 NULL NULL BTREE NO
def dbt3_s001 lineitem 0 dbt3_s001 PRIMARY 2 l_linenumber A 6005 NULL NULL BTREE NO
def dbt3_s001 lineitem 1 dbt3_s001 i_l_shipdate 1 l_shipDATE A 2266 NULL NULL YES BTREE NO
def dbt3_s001 lineitem 1 dbt3_s001 i_l_suppkey_partkey 1 l_partkey A 200 NULL NULL YES BTREE NO
def dbt3_s001 lineitem 1 dbt3_s001 i_l_suppkey_partkey 2 l_suppkey A 699 NULL NULL YES BTREE NO
def dbt3_s001 lineitem 1 dbt3_s001 i_l_partkey 1 l_partkey A 200 NULL NULL YES BTREE NO
def dbt3_s001 lineitem 1 dbt3_s001 i_l_suppkey 1 l_suppkey A 10 NULL NULL YES BTREE NO
def dbt3_s001 lineitem 1 dbt3_s001 i_l_receiptdate 1 l_receiptDATE A 2268 NULL NULL YES BTREE NO
def dbt3_s001 lineitem 1 dbt3_s001 i_l_orderkey 1 l_orderkey A 1500 NULL NULL BTREE NO
def dbt3_s001 lineitem 1 dbt3_s001 i_l_orderkey_quantity 1 l_orderkey A 1500 NULL NULL BTREE NO
def dbt3_s001 lineitem 1 dbt3_s001 i_l_orderkey_quantity 2 l_quantity A 5771 NULL NULL YES BTREE NO
def dbt3_s001 lineitem 1 dbt3_s001 i_l_commitdate 1 l_commitDATE A 2210 NULL NULL YES BTREE NO
SELECT
COUNT(DISTINCT l_orderkey), COUNT(DISTINCT l_orderkey,l_linenumber),
COUNT(DISTINCT l_shipDATE),