ROW keyword mandatory (although it's optional in SQL-99).


mysql-test/r/row_test.result:
  New results with the ROW syntax.
mysql-test/t/row_test.test:
  Updated tests to use the ROW keyword.
sql/sql_yacc.yy:
  Fixed ambiguity between the row value syntax and INTERVAL syntax by making the
  ROW keyword mandatory (although it's optional in SQL-99).
  The real problem might actually be INTERVAL, where the two rules
  "INTERVAL_SYM expr interval '+' expr" and
  "INTERVAL_SYM '(' expr ',' expr_list ')'" caused 40+ reduce/reduce conflicts
  with the rows value syntax.
  So possibly, the INTERVAL syntax should be fixed instead...