(TOK_QUERY (TOK_FROM (TOK_TABREF (TOK_TABNAME src))) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_FUNCTION CONCAT 'a' 'b')) (TOK_SELEXPR (TOK_FUNCTION IF TRUE 1 2))))) null