diff options
Diffstat (limited to 'sql/item_subselect.cc')
| -rw-r--r-- | sql/item_subselect.cc | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/sql/item_subselect.cc b/sql/item_subselect.cc index 98f7c470037..3157d666e9b 100644 --- a/sql/item_subselect.cc +++ b/sql/item_subselect.cc @@ -1,5 +1,5 @@ -/* Copyright (c) 2002, 2015, Oracle and/or its affiliates. - Copyright (c) 2010, 2015, MariaDB +/* Copyright (c) 2002, 2016, Oracle and/or its affiliates. + Copyright (c) 2010, 2016, MariaDB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -3511,9 +3511,14 @@ bool subselect_union_engine::is_executed() const bool subselect_union_engine::no_rows() { /* Check if we got any rows when reading UNION result from temp. table: */ - return MY_TEST(!(unit->fake_select_lex ? - unit->fake_select_lex->join->send_records : - ((select_union_direct *)(unit->get_union_result())) + if (unit->fake_select_lex) + { + JOIN *join= unit->fake_select_lex->join; + if (join) + return MY_TEST(!join->send_records); + return false; + } + return MY_TEST(!(((select_union_direct *)(unit->get_union_result())) ->send_records)); } @@ -4897,9 +4902,9 @@ bool subselect_hash_sj_engine::init(List<Item> *tmp_columns, uint subquery_id) result= result_sink; /* - If the subquery has blobs, or the total key lenght is bigger than + If the subquery has blobs, or the total key length is bigger than some length, or the total number of key parts is more than the - allowed maximum (currently MAX_REF_PARTS == 16), then the created + allowed maximum (currently MAX_REF_PARTS == 32), then the created index cannot be used for lookups and we can't use hash semi join. If this is the case, delete the temporary table since it will not be used, and tell the caller we failed to initialize the |