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Fix the usage of parallel and full options of vacuum command.

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Earlier we were inconsistent in allowing the usage of parallel and
full options.  Change it such that we disallow them only when they are
combined in a way that we don't support.

In passing, improve the comments in some of the existing tests of parallel
vacuum.

Reported-by: Tushar Ahuja
Author: Justin Pryzby, Amit Kapila
Reviewed-by: Sawada Masahiko, Michael Paquier, Mahendra Singh Thalor and
Amit Kapila
Discussion: https://postgr.es/m/58c8d171-e665-6fa3-a9d3-d9423b694dae%40enterprisedb.com
This commit is contained in:
Amit Kapila
2020-04-16 10:44:03 +05:30
parent 542d7817f7
commit 24d2d38b1e
4 changed files with 26 additions and 23 deletions
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6
src/backend/commands/vacuum.c
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@@ -104,7 +104,6 @@ ExecVacuum(ParseState *pstate, VacuumStmt *vacstmt, bool isTopLevel)
bool freeze = false;
bool full = false;
bool disable_page_skipping = false;
bool parallel_option = false;
ListCell *lc;
/* Set default value */
@@ -145,7 +144,6 @@ ExecVacuum(ParseState *pstate, VacuumStmt *vacstmt, bool isTopLevel)
params.truncate = get_vacopt_ternary_value(opt);
else if (strcmp(opt->defname, "parallel") == 0)
{
parallel_option = true;
if (opt->arg == NULL)
{
ereport(ERROR,
@@ -199,10 +197,10 @@ ExecVacuum(ParseState *pstate, VacuumStmt *vacstmt, bool isTopLevel)
!(params.options & (VACOPT_FULL | VACOPT_FREEZE)));
Assert(!(params.options & VACOPT_SKIPTOAST));
if ((params.options & VACOPT_FULL) && parallel_option)
if ((params.options & VACOPT_FULL) && params.nworkers > 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot specify both FULL and PARALLEL options")));
errmsg("VACUUM FULL cannot be performed in parallel")));
/*
* Make sure VACOPT_ANALYZE is specified if any column lists are present.