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MDEV-9641 MDEV-9644 NULLIF assertions

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* only copy args[0] to args[2] after fix_fields (when all item
  substitutions have already happened)

* change QT_ITEM_FUNC_NULLIF_TO_CASE (that allows to print NULLIF
  as CASE) to QT_ITEM_ORIGINAL_FUNC_NULLIF (that prohibits it).
  So that NULLIF-to-CASE is allowed by default and only disabled
  explicitly for SHOW VIEW|FUNCTION|PROCEDURE and mysql_make_view.
  By default it is allowed (in particular in error messages and
  debug output, that can happen anytime before or after optimizer).
This commit is contained in:
Sergei Golubchik
2016-03-03 18:44:10 +01:00
parent 5a3a79ce5f
commit ff93b77fd6
9 changed files with 87 additions and 31 deletions
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3
sql/sql_show.cc
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@ -2352,7 +2352,8 @@ static int show_create_view(THD *thd, TABLE_LIST *table, String *buff)
We can't just use table->query, because our SQL_MODE may trigger
a different syntax, like when ANSI_QUOTES is defined.
*/
table->view->unit.print(buff, QT_ORDINARY);
table->view->unit.print(buff, enum_query_type(QT_ORDINARY |
QT_ITEM_ORIGINAL_FUNC_NULLIF));
if (table->with_check != VIEW_CHECK_NONE)
{