text: -- Copyright [1999-2015] Wellcome Trust Sanger Institute and the EMBL-European Bioinformatics Institute
  -- Copyright [2016-2020] EMBL-European Bioinformatics Institute
  -- 
  -- Licensed under the Apache License, Version 2.0 (the "License");
  -- you may not use this file except in compliance with the License.
  -- You may obtain a copy of the License at
  -- 
  --      http://www.apache.org/licenses/LICENSE-2.0
  -- 
  -- Unless required by applicable law or agreed to in writing, software
  -- distributed under the License is distributed on an "AS IS" BASIS,
  -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  -- See the License for the specific language governing permissions and
  -- limitations under the License.
  
  # patch_84_85_e.sql
  #
  # Title: Add a "md5sum" column in the sequence table
  #
  # Description:
  #   The MD5 checksum allows a much more efficient index search
  #   through the table
  
  -- MySQL should 'die' on warnings, ensuring data is not truncated
  SET session sql_mode='TRADITIONAL';
  
  ALTER TABLE sequence
      ADD COLUMN md5sum CHAR(32) NOT NULL AFTER length,
      DROP INDEX sequence,
      ADD INDEX md5sum (md5sum);
  
  UPDATE sequence SET md5sum = MD5(sequence);
  
  # Patch identifier
  INSERT INTO meta (species_id, meta_key, meta_value)
    VALUES (NULL, 'patch', 'patch_84_85_e.sql|md5sum_sequence');
  