Merge branch 'rebuild_index_for_cadence_iterations_automation' into 'master'

Rebuild iterations automation index

See merge request gitlab-org/gitlab!63858

db/migrate/20210527065005_add_index_for_cadence_iterations_automation.rb

@@ -8,18 +8,10 @@ class AddIndexForCadenceIterationsAutomation < ActiveRecord::Migration[6.0]
   disable_ddl_transaction!
 
   def up
-    return if index_exists_by_name?(:iterations_cadences, INDEX_NAME)
-
-    execute(
-      <<-SQL
-        CREATE INDEX CONCURRENTLY #{INDEX_NAME} ON iterations_cadences
-        USING BTREE(automatic, duration_in_weeks, (DATE ((COALESCE("iterations_cadences"."last_run_date", DATE('01-01-1970')) + "iterations_cadences"."duration_in_weeks" * INTERVAL '1 week')))) 
-        WHERE duration_in_weeks IS NOT NULL
-      SQL
-    )
+    # no-op
   end
 
   def down
-    remove_concurrent_index_by_name :iterations_cadences, INDEX_NAME
+    # no-op
   end
 end

db/migrate/20210611100359_rebuild_index_for_cadence_iterations_automation.rb

+# frozen_string_literal: true
+
+class RebuildIndexForCadenceIterationsAutomation < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  INDEX_NAME = 'cadence_create_iterations_automation'
+
+  disable_ddl_transaction!
+
+  def up
+    return if index_exists_and_is_valid?
+
+    remove_concurrent_index_by_name :iterations_cadences, INDEX_NAME
+
+    disable_statement_timeout do
+      execute(
+        <<-SQL
+          CREATE INDEX CONCURRENTLY #{INDEX_NAME} ON iterations_cadences
+          USING BTREE(automatic, duration_in_weeks, (DATE ((COALESCE("iterations_cadences"."last_run_date", DATE('01-01-1970')) + "iterations_cadences"."duration_in_weeks" * INTERVAL '1 week')))) 
+          WHERE duration_in_weeks IS NOT NULL
+      SQL
+      )
+    end
+  end
+
+  def down
+    remove_concurrent_index_by_name :iterations_cadences, INDEX_NAME
+  end
+
+  def index_exists_and_is_valid?
+    execute(
+      <<-SQL
+        SELECT identifier
+        FROM postgres_indexes
+        WHERE identifier LIKE '%#{INDEX_NAME}' AND valid_index=TRUE
+      SQL
+    ).any?
+  end
+end

db/schema_migrations/20210611100359

+9429a8adca0bc85167f64e76d8d72b45d09d4303a01bd9c4ca39560bb4d89799
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