onversion with check


sql/item.cc:
  removed similar code
sql/item_sum.cc:
  conversion with check
sql/sql_delete.cc:
  conversion with check
sql/sql_derived.cc:
  style fix
sql/sql_lex.cc:
  conversion with check
  moved similar code to function
sql/sql_lex.h:
  conversion with check
  moved similar code to function
sql/sql_parse.cc:
  conversion with check
sql/sql_update.cc:
  conversion with check
sql/sql_yacc.yy:
  conversion with check