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MDEV-24230 subquery on information_schema fails with error message

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disable thd->count_cuted_fields when populating internal temporary
tables for I_S, because this is how SELECT works standalone.
And if the SELECT is a part of INSERT or UPDATE or RETURN or SET or
anything else that enables thd->count_cuted_fields, this counting should
only apply when storing the result of the SELECT in a field or a
variable, not when populating internal temporary tables for I_S.
This commit is contained in:
Sergei Golubchik
2020-11-24 21:33:50 +01:00
parent 00f54b56b1
commit f3b10354a9
3 changed files with 16 additions and 13 deletions
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10
sql/sql_show.cc
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@ -3695,7 +3695,6 @@ static bool show_status_array(THD *thd, const char *wild,
char name_buffer[NAME_CHAR_LEN];
int len;
SHOW_VAR tmp, *var;
Check_level_instant_set check_level_save(thd, CHECK_FIELD_IGNORE);
bool res= FALSE;
CHARSET_INFO *charset= system_charset_info;
DBUG_ENTER("show_status_array");
@ -8669,13 +8668,6 @@ static int optimize_schema_tables_memory_usage(TABLE_LIST *table_list)
DBUG_ASSERT(table->s->keys == 0);
DBUG_ASSERT(table->s->uniques == 0);
// XXX HACK HACK HACK: in a stored function, RETURN (SELECT ...)
// enables warnings (in THD::sp_eval_expr) for the whole val_xxx/store pair,
// while the intention is to warn only for store(). Until this is
// fixed let's avoid data truncation warnings in I_S->fill_table()
if (thd->count_cuted_fields == CHECK_FIELD_IGNORE)
{
uchar *cur= table->field[0]->ptr;
/* first recinfo could be a NULL bitmap, not an actual Field */
from_recinfo= to_recinfo= p->start_recinfo + (cur != table->record[0]);
@ -8709,7 +8701,6 @@ static int optimize_schema_tables_memory_usage(TABLE_LIST *table_list)
to_recinfo++;
}
p->recinfo= to_recinfo;
} // XXX end of HACK HACK HACK
// TODO switch from Aria to Memory if all blobs were optimized away?
if (instantiate_tmp_table(table, p->keyinfo, p->start_recinfo, &p->recinfo,
@ -8872,6 +8863,7 @@ bool get_schema_tables_result(JOIN *join,
}
Switch_to_definer_security_ctx backup_ctx(thd, table_list);
Check_level_instant_set check_level_save(thd, CHECK_FIELD_IGNORE);
if (table_list->schema_table->fill_table(thd, table_list, cond))
{
result= 1;