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MDEV-31224 Crash with EXPLAIN EXTENDED for multi-table update of system table

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EXPLAIN EXTENDED should always print the field item used in the left part
of an equality expression from the SET clause of an update statement as a
reference to table column.

Approved by Oleksandr Byelkin <sanja@mariadb.com>
This commit is contained in:
Igor Babaev 2023-05-09 21:20:10 -07:00
commit 6544d88ff5
4 changed files with 40 additions and 3 deletions
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2
sql/sql_select.cc
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@ -28169,7 +28169,7 @@ void st_select_lex::print_set_clause(THD *thd, String *str,
else
str->append(',');
item->print(str, query_type);
item->print(str, (enum_query_type) (query_type | QT_NO_DATA_EXPANSION));
str->append(STRING_WITH_LEN(" = "));
val->print(str, query_type);
}