Improve tag search query (#16104)

1 files changed, 13 insertions, 0 deletions

diff --git a/db/migrate/20210421121431_add_case_insensitive_btree_index_to_tags.rb b/db/migrate/20210421121431_add_case_insensitive_btree_index_to_tags.rb
new file mode 100644
index 000000000..ed359e8cd
--- /dev/null
+++ b/db/migrate/20210421121431_add_case_insensitive_btree_index_to_tags.rb
@@ -0,0 +1,13 @@
+class AddCaseInsensitiveBtreeIndexToTags < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def up
+    safety_assured { execute 'CREATE UNIQUE INDEX CONCURRENTLY index_tags_on_name_lower_btree ON tags (lower(name) text_pattern_ops)' }
+    remove_index :tags, name: 'index_tags_on_name_lower'
+  end
+
+  def down
+    safety_assured { execute 'CREATE UNIQUE INDEX CONCURRENTLY index_tags_on_name_lower ON tags (lower(name))' }
+    remove_index :tags, name: 'index_tags_on_name_lower_btree'
+  end
+end