Ensembl/ensembl-hive

-- ---------------------------------------------------------------------------------------------------
-- Change   the `worker`.last_check_in to auto-initialize by NULL (bugfix to 6d6edeb)
-- Remove   constraints to deleting `worker`.analysis_id
-- Drop     `worker`.analysis_id
-- ---------------------------------------------------------------------------------------------------

SET @expected_version = 60;

    -- make MySQL stop immediately after it encounters division by zero:
SET SESSION sql_mode='TRADITIONAL';

    -- warn that we detected the schema version mismatch:
SELECT CONCAT(  'The patch only applies to schema version ',
                @expected_version,
                ', but the current schema version is ',
                meta_value,
                ', so skipping the rest.') AS ''
    FROM hive_meta WHERE meta_key='hive_sql_schema_version' AND meta_value<>@expected_version;

    -- cause division by zero only if current version differs from the expected one:
INSERT INTO hive_meta (meta_key, meta_value)
    SELECT 'this_should_never_be_inserted', 1 FROM hive_meta WHERE NOT 1/(meta_key<>'hive_sql_schema_version' OR meta_value=@expected_version);

SELECT CONCAT(  'The patch seems to be compatible with schema version ',
                @expected_version,
                ', applying the patch...') AS '';

    -- Now undo the change so that we could patch potentially non-TRADITIONAL schema:
SET SESSION sql_mode='';

-- ----------------------------------<actual_patch> -------------------------------------------------

    -- bugfix [to 6d6edeb] : make sure the default timestamp is auto-initialized to NULL:
ALTER TABLE worker MODIFY COLUMN last_check_in TIMESTAMP NULL DEFAULT NULL;


    -- First remove the foreign key from worker.analysis_id:
ALTER TABLE worker DROP FOREIGN KEY worker_ibfk_1;

    -- And an index from the same column:
ALTER TABLE worker DROP INDEX analysis_status;

    -- Now we can drop the column itself:
ALTER TABLE worker DROP COLUMN analysis_id;

-- ----------------------------------</actual_patch> -------------------------------------------------


    -- increase the schema version by one:
UPDATE hive_meta SET meta_value=meta_value+1 WHERE meta_key='hive_sql_schema_version';