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Improve readability of code PROCESS_MAIN in vacuum_rel()

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4211fbd has been handling PROCESS_MAIN in vacuum_rel() with an "if/else
if" structure to avoid an extra level of indentation, but this has been
found as being rather parse to read.  This commit updates the code so as
we check for PROCESS_MAIN in a single place and then handle its
subpaths, FULL or non-FULL vacuums.  Some comments are added to make
that clearer for the reader.

Reported-by: Melanie Plageman
Author: Nathan Bossart
Reviewed-by: Michael Paquier, Melanie Plageman
Discussion: https://postgr.es/m/20230306194009.5cn6sp3wjotd36nu@liskov
This commit is contained in:
Michael Paquier 2023-03-08 09:16:44 +09:00
parent 99be6feec9
commit ee56048b0e
1 changed files with 21 additions and 13 deletions
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14
src/backend/commands/vacuum.c
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@ -2057,11 +2057,18 @@ vacuum_rel(Oid relid, RangeVar *relation, VacuumParams *params, bool skip_privs)
save_sec_context | SECURITY_RESTRICTED_OPERATION);
save_nestlevel = NewGUCNestLevel();
/*
* If PROCESS_MAIN is set (the default), it's time to vacuum the main
* relation. Otherwise, we can skip this part. If processing the TOAST
* table is required (e.g., PROCESS_TOAST is set), we force PROCESS_MAIN
* to be set when we recurse to the TOAST table.
*/
if (params->options & VACOPT_PROCESS_MAIN)
{
/*
* Do the actual work --- either FULL or "lazy" vacuum
*/
if ((params->options & VACOPT_FULL) &&
(params->options & VACOPT_PROCESS_MAIN))
if (params->options & VACOPT_FULL)
{
ClusterParams cluster_params = {0};
@ -2075,8 +2082,9 @@ vacuum_rel(Oid relid, RangeVar *relation, VacuumParams *params, bool skip_privs)
/* VACUUM FULL is now a variant of CLUSTER; see cluster.c */
cluster_rel(relid, InvalidOid, &cluster_params);
}
else if (params->options & VACOPT_PROCESS_MAIN)
else
table_relation_vacuum(rel, params, vac_strategy);
}
/* Roll back any GUC changes executed by index functions */
AtEOXact_GUC(false, save_nestlevel);