(TOK_QUERY (TOK_FROM (TOK_TABREF (TOK_TABNAME src1))) (TOK_INSERT (TOK_DESTINATION (TOK_TAB (TOK_TABNAME dest1))) (TOK_SELECT (TOK_SELEXPR TOK_NULL) (TOK_SELEXPR (. (TOK_TABLE_OR_COL src1) key))) (TOK_WHERE (= TOK_NULL TOK_NULL)))) null