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Bug#40953 SELECT query throws "ERROR 1062 (23000): Duplicate entry..." error

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Table could be marked dependent because it is
either 1) an inner table of an outer join, or 2) it is a part of
STRAIGHT_JOIN. In case of STRAIGHT_JOIN table->maybe_null should not
be assigned. The fix is to set st_table::maybe_null to 'true' only
for those tables which are used in outer join.
This commit is contained in:
Sergey Glukhov
2008-12-24 19:24:11 +04:00
parent 026e9c3676
commit a31795b82d
4 changed files with 75 additions and 2 deletions
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2
sql/sql_select.cc
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@ -2489,7 +2489,7 @@ make_join_statistics(JOIN *join, TABLE_LIST *tables, COND *conds,
if (s->dependent & table->map)
s->dependent |= table->reginfo.join_tab->dependent;
}
if (s->dependent)
if (outer_join & s->table->map)
s->table->maybe_null= 1;
}
/* Catch illegal cross references for outer joins */