Raise minimum PostgreSQL version to 11

This lets us get rid off a runtime check and avoids problems with hash
indices being unsafe and broken before version 10. We currently don't
have any hash indices, but might soon™ add some.

Even PostgreSQL 11 is already EOL since 2023-11-09,
so this shouldn’t actually impact anyone.

docs/docs/installation/generic_dependencies.include

@@ -1,6 +1,6 @@
 ## Required dependencies
 
-* PostgreSQL 9.6+
+* PostgreSQL 11+ (but only the two most recent major versions are actively tested)
 * Elixir 1.14+ (currently tested up to 1.16)
 * Erlang OTP 25+ (currently tested up to OTP26)
 * git

lib/pleroma/application.ex

@@ -95,10 +95,10 @@ def start(_type, _args) do
 
     opts = [strategy: :one_for_one, name: Pleroma.Supervisor, max_restarts: max_restarts]
 
-    with {:ok, data} <- Supervisor.start_link(children, opts) do
-      set_postgres_server_version()
-      {:ok, data}
-    else
+    case Supervisor.start_link(children, opts) do
+      {:ok, data} ->
+        {:ok, data}
+
       e ->
         Logger.error("Failed to start!")
         Logger.error("#{inspect(e)}")
@@ -106,23 +106,6 @@ def start(_type, _args) do
     end
   end
 
-  defp set_postgres_server_version do
-    version =
-      with %{rows: [[version]]} <- Ecto.Adapters.SQL.query!(Pleroma.Repo, "show server_version"),
-           {num, _} <- Float.parse(version) do
-        num
-      else
-        e ->
-          Logger.warning(
-            "Could not get the postgres version: #{inspect(e)}.\nSetting the default value of 9.6"
-          )
-
-          9.6
-      end
-
-    :persistent_term.put({Pleroma.Repo, :postgres_version}, version)
-  end
-
   def load_custom_modules do
     dir = Config.get([:modules, :runtime_dir])
 

lib/pleroma/search/database_search.ex

@@ -21,19 +21,12 @@ def search(user, search_query, options \\ []) do
     offset = Keyword.get(options, :offset, 0)
     author = Keyword.get(options, :author)
 
-    search_function =
-      if :persistent_term.get({Pleroma.Repo, :postgres_version}) >= 11 do
-        :websearch
-      else
-        :plain
-      end
-
     try do
       Activity
       |> Activity.with_preloaded_object()
       |> Activity.restrict_deactivated_users()
       |> restrict_public()
-      |> query_with(index_type, search_query, search_function)
+      |> query_with(index_type, search_query)
       |> maybe_restrict_local(user)
       |> maybe_restrict_author(author)
       |> maybe_restrict_blocked(user)
@@ -72,25 +65,7 @@ def restrict_public(q) do
     )
   end
 
-  defp query_with(q, :gin, search_query, :plain) do
-    %{rows: [[tsc]]} =
-      Ecto.Adapters.SQL.query!(
-        Pleroma.Repo,
-        "select current_setting('default_text_search_config')::regconfig::oid;"
-      )
-
-    from([a, o] in q,
-      where:
-        fragment(
-          "to_tsvector(?::oid::regconfig, ?->>'content') @@ plainto_tsquery(?)",
-          ^tsc,
-          o.data,
-          ^search_query
-        )
-    )
-  end
-
-  defp query_with(q, :gin, search_query, :websearch) do
+  defp query_with(q, :gin, search_query) do
     %{rows: [[tsc]]} =
       Ecto.Adapters.SQL.query!(
         Pleroma.Repo,
@@ -108,19 +83,7 @@ defp query_with(q, :gin, search_query, :websearch) do
     )
   end
 
-  defp query_with(q, :rum, search_query, :plain) do
-    from([a, o] in q,
-      where:
-        fragment(
-          "? @@ plainto_tsquery(?)",
-          o.fts_content,
-          ^search_query
-        ),
-      order_by: [fragment("? <=> now()::date", o.inserted_at)]
-    )
-  end
-
-  defp query_with(q, :rum, search_query, :websearch) do
+  defp query_with(q, :rum, search_query) do
     from([a, o] in q,
       where:
         fragment(

test/pleroma/search/database_search_test.exs

@@ -18,21 +18,6 @@ test "it finds something" do
     assert result.id == post.id
   end
 
-  test "using plainto_tsquery on postgres < 11" do
-    old_version = :persistent_term.get({Pleroma.Repo, :postgres_version})
-    :persistent_term.put({Pleroma.Repo, :postgres_version}, 10.0)
-    on_exit(fn -> :persistent_term.put({Pleroma.Repo, :postgres_version}, old_version) end)
-
-    user = insert(:user)
-    {:ok, post} = CommonAPI.post(user, %{status: "it's wednesday my dudes"})
-    {:ok, _post2} = CommonAPI.post(user, %{status: "it's wednesday my bros"})
-
-    # plainto doesn't understand complex queries
-    assert [result] = DatabaseSearch.search(nil, "wednesday -dudes")
-
-    assert result.id == post.id
-  end
-
   test "using websearch_to_tsquery" do
     user = insert(:user)
     {:ok, _post} = CommonAPI.post(user, %{status: "it's wednesday my dudes"})