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MDEV-26220 Server crashes with indexed by prefix virtual column

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Server crashes in Field::register_field_in_read_map upon select from
partitioned table with indexed by prefix virtual column.

After several read-mark fixes a problem has surfaced:
Since KEY (c(10),a) uses only a prefix of c, a new field is created,
duplicated from table->field[3], with a new length. However,
vcol_inco->expr is not copied.

Therefore, (*key_info)->key_part[i].field->vcol_info->expr was left NULL
in ha_partition::index_init().

Solution: copy vcol_info from table field when it's set up.
This commit is contained in:
Nikita Malyavin 2021-07-23 14:16:34 +03:00 • committed by Oleksandr Byelkin
commit b549af6913
4 changed files with 49 additions and 0 deletions
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15
sql/table.cc
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@ -3284,6 +3284,21 @@ enum open_frm_error open_table_from_share(THD *thd, TABLE_SHARE *share,
/* Update to use trigger fields */
switch_defaults_to_nullable_trigger_fields(outparam);
for (uint k= 0; k < share->keys; k++)
{
KEY &key_info= outparam->key_info[k];
uint parts = (share->use_ext_keys ? key_info.ext_key_parts :
key_info.user_defined_key_parts);
for (uint p= 0; p < parts; p++)
{
KEY_PART_INFO &kp= key_info.key_part[p];
if (kp.field != outparam->field[kp.fieldnr - 1])
{
kp.field->vcol_info = outparam->field[kp.fieldnr - 1]->vcol_info;
}
}
}
}
#ifdef WITH_PARTITION_STORAGE_ENGINE