(TOK_QUERY (TOK_FROM (TOK_SUBQUERY (TOK_QUERY (TOK_FROM (TOK_TABREF src)) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_ALLCOLREF src))) (TOK_WHERE (< (. (TOK_TABLE_OR_COL src) key) 100)))) unioninput)) (TOK_INSERT (TOK_DESTINATION (TOK_DIR '../build/ql/test/data/warehouse/union.out')) (TOK_SELECT (TOK_SELEXPR (TOK_ALLCOLREF unioninput))))) null