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-rw-r--r--sql/item_cmpfunc.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc
index c5e6d520ab7..46ef3281dd1 100644
--- a/sql/item_cmpfunc.cc
+++ b/sql/item_cmpfunc.cc
@@ -1503,7 +1503,11 @@ void in_string::set(uint pos,Item *item)
String *str=((String*) base)+pos;
String *res=item->val_str(str);
if (res && res != str)
+ {
+ if (res->uses_buffer_owned_by(str))
+ res->copy();
*str= *res;
+ }
if (!str->charset())
{
CHARSET_INFO *cs;