Make SQL UDF persistent in clickhouse-local

Author: alexey-milovidov

programs/local/LocalServer.cpp

@@ -948,14 +948,14 @@ void LocalServer::processConfig()
                 DatabaseCatalog::instance().startupBackgroundTasks();
             }
 
-            /// For ClickHouse local if path is not set the loader will be disabled.
-            global_context->getUserDefinedSQLObjectsStorage().loadObjects();
-
             LOG_DEBUG(log, "Loaded metadata.");
         }
 
         if (!attached_system_database)
             attachSystemTablesServer(global_context, *createMemoryDatabaseIfNotExists(global_context, DatabaseCatalog::SYSTEM_DATABASE), false);
+
+        if (fs::exists(fs::path(path) / "user_defined"))
+            global_context->getUserDefinedSQLObjectsStorage().loadObjects();
     }
     else if (!getClientConfiguration().has("no-system-tables"))
     {

tests/queries/0_stateless/03463_local_sql_udf_persistence.reference

@@ -0,0 +1,2 @@
+2
+3

tests/queries/0_stateless/03463_local_sql_udf_persistence.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CURDIR"/../shell_config.sh
+
+$CLICKHOUSE_LOCAL --path "${CLICKHOUSE_TMP}" "CREATE FUNCTION f AS x -> x + 1; SELECT f(1);"
+$CLICKHOUSE_LOCAL --path "${CLICKHOUSE_TMP}" "SELECT f(2); DROP FUNCTION f;"