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MDEV-26458 Crash on ALTER TABLE after DISCARD TABLESPACE

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ha_innobase::check_if_supported_inplace_alter(): Do not invoke
innobase_table_is_empty() if the tablespace has been discarded.
That is, native ALTER TABLE in InnoDB will treat an empty table
in the same way as a tablespace whose tablespace has been discarded.
(Note: ALTER TABLE...ALGORITHM=COPY will fail if the tablespace
has been discarded.)

This fixes a crash that was introduced
in commit c755974775 (MDEV-19611).
This commit is contained in:
Marko Mäkelä 2021-08-23 09:13:55 +03:00
commit 7b492d6a70
3 changed files with 25 additions and 0 deletions
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storage/innobase/handler/handler0alter.cc
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@ -1164,6 +1164,7 @@ ha_innobase::check_if_supported_inplace_alter(
/* '0000-00-00' value isn't allowed for datetime datatype
for newly added column when table is not empty */
if (ha_alter_info->error_if_not_empty
&& m_prebuilt->table->space
&& !innobase_table_is_empty(m_prebuilt->table)) {
DBUG_RETURN(HA_ALTER_INPLACE_NOT_SUPPORTED);
}