diff options
Diffstat (limited to 'sql')
| -rw-r--r-- | sql/item_cmpfunc.cc | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc index b766d1e857b..6b6996160a1 100644 --- a/sql/item_cmpfunc.cc +++ b/sql/item_cmpfunc.cc @@ -916,8 +916,30 @@ void Item_func_between::fix_length_and_dec() if (!args[0] || !args[1] || !args[2]) return; agg_cmp_type(thd, &cmp_type, args, 3); - if (cmp_type == STRING_RESULT) - agg_arg_charsets(cmp_collation, args, 3, MY_COLL_CMP_CONV); + if (cmp_type == STRING_RESULT && + agg_arg_charsets(cmp_collation, args, 3, MY_COLL_CMP_CONV)) + return; + + /* + Make a special case of compare with date/time and longlong fields. + They are compared as integers, so for const item this time-consuming + conversion can be done only once, not for every single comparison + */ + if (args[0]->type() == FIELD_ITEM) + { + Field *field=((Item_field*) args[0])->field; + if (field->can_be_compared_as_longlong()) + { + /* + The following can't be recoded with || as convert_constant_item + changes the argument + */ + if (convert_constant_item(thd, field,&args[1])) + cmp_type=INT_RESULT; // Works for all types. + if (convert_constant_item(thd, field,&args[2])) + cmp_type=INT_RESULT; // Works for all types. + } + } } |