Previously, amcheck could produce misleading error message when
a partitioned index was passed to functions like bt_index_check().
For example, bt_index_check() with a partitioned btree index produced:
ERROR: expected "btree" index as targets for verification
DETAIL: Relation ... is a btree index.
Reporting "expected btree index as targets" even when the specified
index was a btree was confusing. In this case, the function should fail
since the partitioned index specified is not valid target. This commit
improves the error reporting to better reflect this actual issue. Now,
bt_index_check() with a partitioned index, the error message is:
ERROR: expected index as targets for verification
DETAIL: This operation is not supported for partitioned indexes.
This commit also applies the following minor changes:
- Simplifies index_checkable() by using get_am_name() to retrieve
the access method name.
- Changes index_checkable() from extern to static, as it is only used
in verify_common.c.
- Updates the error code for invalid indexes to
ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE,
aligning with usage in similar modules like pgstattuple.
Author: Masahiro Ikeda <ikedamsh@oss.nttdata.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/8829854bbfc8635ddecd0846bb72dfda@oss.nttdata.com
Before performing checks on an index, we need to take some safety
measures that apply to all index AMs. This includes:
* verifying that the index can be checked - Only selected AMs are
supported by amcheck (right now only B-Tree). The index has to be
valid and not a temporary index from another session.
* changing (and then restoring) user's security context
* obtaining proper locks on the index (and table, if needed)
* discarding GUC changes from the index functions
Until now this was implemented in the B-Tree amcheck module, but it's
something every AM will have to do. So relocate the code into a new
module verify_common for reuse.
The shared steps are implemented by amcheck_lock_relation_and_check(),
receiving the AM-specific verification as a callback. Custom parameters
may be supplied using a pointer.
Author: Andrey Borodin <amborodin@acm.org>
Reviewed-By: José Villanova <jose.arthur@gmail.com>
Reviewed-By: Aleksander Alekseev <aleksander@timescale.com>
Reviewed-By: Nikolay Samokhvalov <samokhvalov@gmail.com>
Reviewed-By: Andres Freund <andres@anarazel.de>
Reviewed-By: Tomas Vondra <tomas@vondra.me>
Reviewed-By: Mark Dilger <mark.dilger@enterprisedb.com>
Reviewed-By: Peter Geoghegan <pg@bowt.ie>
Reviewed-By: Kirill Reshke <reshkekirill@gmail.com>
Discussion: https://postgr.es/m/45AC9B0A-2B45-40EE-B08F-BDCF5739D1E1%40yandex-team.ru
