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MDEV-23330 Server crash or ASAN negative-size-param in my_strnncollsp_binary / SORT_FIELD_ATTR::compare_packed_varstrings

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MDEV-23414 Assertion `res->charset() == item->collation.collation' failed in Type_handler_string_result::make_packed_sort_key_part

pack_sort_string() *must* take a collation from the Item, not from the
String value. Because when casting a string to _binary the original
String is not copied for performance reasons, it's reused but its
collation does not match Item's collation anymore.

Note, that String's collation cannot be simply changed to _binary,
because for an Item_string literal the original String must stay
unchanged for the duration of the query.

this partially reverts 61c15ebe32
This commit is contained in:
Sergei Golubchik
2020-08-07 13:37:41 +02:00
parent e081415040
commit cd2924bacb
12 changed files with 93 additions and 10 deletions
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2
sql/sql_string.h
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@ -882,7 +882,7 @@ public:
{
return Binary_string::append_hex((const char*)src, srclen);
}
bool append_introducer_and_hex(String *str)
bool append_introducer_and_hex(const String *str)
{
return
append(STRING_WITH_LEN("_")) ||