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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.



mysql-test/r/select.result:
  test result
mysql-test/t/select.test:
  test case
sql/sql_select.cc:
  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.
sql/sql_select.h:
  added comment
This commit is contained in:
Sergey Glukhov
2008-12-24 19:24:11 +04:00
parent 7103f4c916
commit ce985aa36e
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 */