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BUG#912510: Crash in do_copy_not_null with semijoin=ON, firstmatch=ON, aggregate ...

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- Create/use do_copy_nullable_row_to_notnull() function for ref access, which is used 
  when copying from not-NULL field in table that can be NULL-complemented to not-NULL field.
This commit is contained in:
Sergey Petrunya
2012-01-08 14:43:14 +04:00
parent cd55894a52
commit 0b590282fc
5 changed files with 84 additions and 1 deletions
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3
sql/sql_select.cc
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@ -646,6 +646,9 @@ JOIN::prepare(Item ***rref_pointer_array,
aggregate functions and non-aggregate fields, any non-aggregated field
may produce a NULL value. Set all fields of each table as nullable before
semantic analysis to take into account this change of nullability.
Note: this loop doesn't touch tables inside merged semi-joins, because
subquery-to-semijoin conversion has not been done yet. This is intended.
*/
if (mixed_implicit_grouping)
tbl->table->maybe_null= 1;