diff options
Diffstat (limited to 'sql')
| -rw-r--r-- | sql/sql_select.cc | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/sql/sql_select.cc b/sql/sql_select.cc index 3d78000b3d4..529ecd78836 100644 --- a/sql/sql_select.cc +++ b/sql/sql_select.cc @@ -14762,6 +14762,28 @@ static Field *create_tmp_field_from_item(THD *thd, Item *item, TABLE *table, if (item->cmp_type() == TIME_RESULT || item->field_type() == MYSQL_TYPE_GEOMETRY) new_field= item->tmp_table_field_from_field_type(table, 1); + else if (item->type() == Item::FUNC_ITEM && + static_cast<Item_func*>(item)->functype() == Item_func::SUSERVAR_FUNC) + { + /* + A temporary solution for versions 5.5 .. 10.3. + This change should be null-merged to 10.4. + + Item_func_set_user_var is special. It overrides make_field(). + by adding a special branch `if (result_field)...`. + So it's important to preserve the exact data type here, + to avoid type mismatch in Protocol_text::store_longlong() + See MDEV-15955. + + Other Item_func descendants are not affected by MDEV-15955. + They don't override make_field() so they don't use result_field + when initializing Send_field. + + This is properly fixed in 10.4 in the method + Item_func_user_var::create_tmp_field_ex(). + */ + new_field= item->tmp_table_field_from_field_type(table, false); + } else switch (item->result_type()) { case REAL_RESULT: |