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    Details

    • Type: Technical task
    • Status: In Review (View Workflow)
    • Priority: Critical
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: 10.6
    • Component/s: Server
    • Labels:
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      Description

      1. Introduce Foreign_key_io class which creates/parses binary stream containing foreign key structures. Referenced tables store there only hints about foreign tables (their db and name), they restore full info from the corresponding tables.

      Foreign_key_io is stored under new EXTRA2_FOREIGN_KEY_INFO field in extra2 section of FRM file.

      2. Modify mysql_prepare_create_table() to generate names for foreign keys. Until InnoDB storage of foreign keys is removed, FK names must be unique across the database: the FK name must be based on table name.

      3. Keep stored data in sync on DDL changes. Referenced tables update their foreign hints after following operations on foreign tables:

      • RENAME TABLE
      • DROP TABLE
      • CREATE TABLE
      • ADD FOREIGN KEY
      • DROP FOREIGN KEY

      Foreign tables update their foreign info after following operations on referenced tables:

      • RENAME TABLE
      • RENAME COLUMN

      4. To achieve 3. there must be ability to rewrite extra2 section of FRM file without full reparse. FRM binary is built from primary structures like HA_CREATE_INFO and cannot be built from TABLE_SHARE.

      Use shadow write and rename like fast_alter_partition_table() does.

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              Assignee:
              serg Sergei Golubchik
              Reporter:
              midenok Aleksey Midenkov
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                Created:
                Updated: