[MDEV-35616] Add basic optimizer support for virtual columns - Jira

Details

Type: New Feature
Status: Closed (View Workflow)
Priority: Critical
Resolution: Fixed
Fix Version/s: 11.8.1
Component/s: Optimizer
Labels:

Description

This MDEV covers basic optimizer support for virtual columns added in 11.8.

If a user declares a virtual column and an index on it

ALTER TABLE t1

  ADD COLUMN vcol INT AS (col1+1),

  ADD INDEX idx1(vcol);

and then a query uses the exact same expression:

SELECT * FROM t1 WHERE col1+1 <= 100

Then the optimizer will rewrite the above into

... WHERE vcol <= 100

which enables the rest of the optimizer to construct query plans that use index idx1.

The rewrite is performed in WHERE/ON clauses (and only there).
The rewrite targets indexed virtual columns.
The rewrite targets a subset of conditions usable by the range optimizer:

vcol_expr $CMP const1 where $CMP is = or [less|greater][or equal].

vcol_expr BETWEEN const1 AND const2

vcol_expr IN (const-list)

vcol_expr IS [NOT] NULL

Attachments

Issue Links

blocks

MXS-5346 Properly support [create|drop|list]Indexes

Closed

causes

MDEV-35833 Assertion `marked_for_read()' failed after DELETE/UPDATE from table with virtual columns

Closed

MDEV-35913 Assertion `m_comparator.cmp_type() != ROW_RESULT' failed in bool Item_func_in::compatible_types_scalar_bisection_possible()

Open

is part of

MDEV-6017 Add support for Indexes on Expressions

Stalled

relates to

MDEV-35615 Query optimizer support for functional indexes: next steps

Open

MDEV-35496 JSON_UNQUOTE produces utf8mb3 output while JSON can be utf8mb4

Closed

MDEV-36299 Issues with collations when using indexed JSON attribute search

Open

(2 relates to)

Activity

Ascending order - Click to sort in descending order

Sergei Petrunia created issue - 2024-12-10 12:34

Sergei Petrunia made changes - 2024-12-10 12:36

Field	Original Value	New Value
Component/s		Optimizer [ 10200 ]

Sergei Petrunia made changes - 2024-12-10 12:36

Labels

optimizer-feature