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  1. MariaDB Server
  2. MDEV-35616

Add basic optimizer support for virtual columns

Details

    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

          New Feature - A new feature of the product, which has yet to be developed. MXS-5346 Properly support [create|drop|list]Indexes

          • Major - Major loss of function.
          • Closed
          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-35833 Assertion `marked_for_read()' failed after DELETE/UPDATE from table with virtual columns

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-35913 Assertion `m_comparator.cmp_type() != ROW_RESULT' failed in bool Item_func_in::compatible_types_scalar_bisection_possible()

          • Critical - Crashes, loss of data, severe memory leak.
          • Open
          is part of

          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. MDEV-6017 Add support for Indexes on Expressions

          • Major - Major loss of function.
          • Stalled
          relates to

          New Feature - A new feature of the product, which has yet to be developed. MDEV-35615 Query optimizer support for functional indexes: next steps

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-35496 JSON_UNQUOTE produces utf8mb3 output while JSON can be utf8mb4

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-36299 Issues with collations when using indexed JSON attribute search

          • Major - Major loss of function.
          • Open

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              psergei Sergei Petrunia
              psergei Sergei Petrunia
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              Dates

                Created:
                Updated:
                Resolved:

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