[#477] User trigram index adjustment.

lib/pleroma/user.ex

@@ -744,7 +744,7 @@ defp trigram_search_subquery(query) do
       select_merge: %{
         search_rank:
           fragment(
-            "similarity(?, ? || ' ' || coalesce(?, ''))",
+            "similarity(?, trim(? || ' ' || coalesce(?, '')))",
             ^query,
             u.nickname,
             u.name

priv/repo/migrations/20190118074940_fix_user_trigram_index.exs

@@ -0,0 +1,13 @@
+defmodule Pleroma.Repo.Migrations.FixUserTrigramIndex do
+  use Ecto.Migration
+
+  def up do
+    drop_if_exists index(:users, [], name: :users_trigram_index)
+    create index(:users, ["(trim(nickname || ' ' || name)) gist_trgm_ops"], name: :users_trigram_index, using: :gist)
+  end
+
+  def down do
+    drop_if_exists index(:users, [], name: :users_trigram_index)
+    create index(:users, ["(nickname || name) gist_trgm_ops"], name: :users_trigram_index, using: :gist)
+  end
+end