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Add SETTINGS option to EXPLAIN, to print modified settings. 

Query planning is affected by a number of configuration options, and it
may be crucial to know which of those options were set to non-default
values.  With this patch you can say EXPLAIN (SETTINGS ON) to include
that information in the query plan.  Only options affecting planning,
with values different from the built-in default are printed.

This patch also adds auto_explain.log_settings option, providing the
same capability in auto_explain module.

Author: Tomas Vondra
Reviewed-by: Rafia Sabih, John Naylor
Discussion: https://postgr.es/m/e1791b4c-df9c-be02-edc5-7c8874944be0@2ndquadrant.com
This commit is contained in:
Tomas Vondra 2019-04-04 00:04:31 +02:00
parent d1f04b96b9
commit ea569d64ac
8 changed files with 333 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
contrib/auto_explain/auto_explain.c
View File

@ -28,6 +28,7 @@ static bool auto_explain_log_verbose = false;
static bool auto_explain_log_buffers = false;
static bool auto_explain_log_triggers = false;
static bool auto_explain_log_timing = true;
static bool auto_explain_log_settings = false;
static int auto_explain_log_format = EXPLAIN_FORMAT_TEXT;
static int auto_explain_log_level = LOG;
static bool auto_explain_log_nested_statements = false;
@ -112,6 +113,17 @@ _PG_init(void)
NULL,
NULL);
DefineCustomBoolVariable("auto_explain.log_settings",
"Log modified configuration parameters affecting query planning.",
NULL,
&auto_explain_log_settings,
false,
PGC_SUSET,
0,
NULL,
NULL,
NULL);
DefineCustomBoolVariable("auto_explain.log_verbose",
"Use EXPLAIN VERBOSE for plan logging.",
NULL,
@ -356,6 +368,7 @@ explain_ExecutorEnd(QueryDesc *queryDesc)
es->timing = (es->analyze && auto_explain_log_timing);
es->summary = es->analyze;
es->format = auto_explain_log_format;
es->settings = auto_explain_log_settings;
ExplainBeginOutput(es);
ExplainQueryText(es, queryDesc);

18
doc/src/sgml/auto-explain.sgml
View File

@ -169,6 +169,24 @@ LOAD 'auto_explain';
</listitem>
</varlistentry>
<varlistentry>
<term>
<varname>auto_explain.log_settings</varname> (<type>boolean</type>)
<indexterm>
<primary><varname>auto_explain.log_settings</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
<varname>auto_explain.log_settings</varname> controls whether information
about modified configuration options are printed when execution plan is logged.
Only options affecting query planning with value different from the built-in
default value are included in the output. This parameter is off by default.
Only superusers can change this setting.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<varname>auto_explain.log_format</varname> (<type>enum</type>)

12
doc/src/sgml/ref/explain.sgml
View File

@ -39,6 +39,7 @@ EXPLAIN [ ANALYZE ] [ VERBOSE ] <replaceable class="parameter">statement</replac
ANALYZE [ <replaceable class="parameter">boolean</replaceable> ]
VERBOSE [ <replaceable class="parameter">boolean</replaceable> ]
COSTS [ <replaceable class="parameter">boolean</replaceable> ]
SETTINGS [ <replaceable class="parameter">boolean</replaceable> ]
BUFFERS [ <replaceable class="parameter">boolean</replaceable> ]
TIMING [ <replaceable class="parameter">boolean</replaceable> ]
SUMMARY [ <replaceable class="parameter">boolean</replaceable> ]
@ -152,6 +153,17 @@ ROLLBACK;
</listitem>
</varlistentry>
<varlistentry>
<term><literal>SETTINGS</literal></term>
<listitem>
<para>
Include information on configuration parameters. Specifically, include
options affecting query planning with value different from the built-in
default value. This parameter defaults to <literal>FALSE</literal>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>BUFFERS</literal></term>
<listitem>

76
src/backend/commands/explain.c
View File

@ -29,6 +29,7 @@
#include "storage/bufmgr.h"
#include "tcop/tcopprot.h"
#include "utils/builtins.h"
#include "utils/guc_tables.h"
#include "utils/json.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
@ -162,6 +163,8 @@ ExplainQuery(ParseState *pstate, ExplainStmt *stmt, const char *queryString,
es->costs = defGetBoolean(opt);
else if (strcmp(opt->defname, "buffers") == 0)
es->buffers = defGetBoolean(opt);
else if (strcmp(opt->defname, "settings") == 0)
es->settings = defGetBoolean(opt);
else if (strcmp(opt->defname, "timing") == 0)
{
timing_set = true;
@ -596,6 +599,73 @@ ExplainOnePlan(PlannedStmt *plannedstmt, IntoClause *into, ExplainState *es,
ExplainCloseGroup("Query", NULL, true, es);
}
/*
* ExplainPrintSettings -
* Print summary of modified settings affecting query planning.
*/
static void
ExplainPrintSettings(ExplainState *es)
{
int num;
struct config_generic **gucs;
/* bail out if information about settings not requested */
if (!es->settings)
return;
/* request an array of relevant settings */
gucs = get_explain_guc_options(&num);
/* also bail out of there are no options */
if (!num)
return;
if (es->format != EXPLAIN_FORMAT_TEXT)
{
int i;
ExplainOpenGroup("Settings", "Settings", true, es);
for (i = 0; i < num; i++)
{
char *setting;
struct config_generic *conf = gucs[i];
setting = GetConfigOptionByName(conf->name, NULL, true);
ExplainPropertyText(conf->name, setting, es);
}
ExplainCloseGroup("Settings", "Settings", true, es);
}
else
{
int i;
StringInfoData str;
initStringInfo(&str);
for (i = 0; i < num; i++)
{
char *setting;
struct config_generic *conf = gucs[i];
if (i > 0)
appendStringInfoString(&str, ", ");
setting = GetConfigOptionByName(conf->name, NULL, true);
if (setting)
appendStringInfo(&str, "%s = '%s'", conf->name, setting);
else
appendStringInfo(&str, "%s = NULL", conf->name);
}
if (num > 0)
ExplainPropertyText("Settings", str.data, es);
}
}
/*
* ExplainPrintPlan -
* convert a QueryDesc's plan tree to text and append it to es->str
@ -633,6 +703,12 @@ ExplainPrintPlan(ExplainState *es, QueryDesc *queryDesc)
if (IsA(ps, GatherState) &&((Gather *) ps->plan)->invisible)
ps = outerPlanState(ps);
ExplainNode(ps, NIL, NULL, NULL, es);
/*
* If requested, include information about GUC parameters with values
* that don't match the built-in defaults.
*/
ExplainPrintSettings(es);
}
/*

262
src/backend/utils/misc/guc.c
View File

@ -882,7 +882,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_seqscan", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of sequential-scan plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_seqscan,
true,
@ -891,7 +892,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_indexscan", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of index-scan plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_indexscan,
true,
@ -900,7 +902,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_indexonlyscan", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of index-only-scan plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_indexonlyscan,
true,
@ -909,7 +912,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_bitmapscan", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of bitmap-scan plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_bitmapscan,
true,
@ -918,7 +922,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_tidscan", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of TID scan plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_tidscan,
true,
@ -927,7 +932,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_sort", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of explicit sort steps."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_sort,
true,
@ -936,7 +942,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_hashagg", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of hashed aggregation plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_hashagg,
true,
@ -945,7 +952,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_material", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of materialization."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_material,
true,
@ -954,7 +962,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_nestloop", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of nested-loop join plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_nestloop,
true,
@ -963,7 +972,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_mergejoin", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of merge join plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_mergejoin,
true,
@ -972,7 +982,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_hashjoin", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of hash join plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_hashjoin,
true,
@ -981,7 +992,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_gathermerge", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of gather merge plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_gathermerge,
true,
@ -990,7 +1002,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_partitionwise_join", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables partitionwise join."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_partitionwise_join,
false,
@ -999,7 +1012,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_partitionwise_aggregate", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables partitionwise aggregation and grouping."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_partitionwise_aggregate,
false,
@ -1008,7 +1022,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_parallel_append", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of parallel append plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_parallel_append,
true,
@ -1017,7 +1032,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"enable_parallel_hash", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of parallel hash plans."),
NULL
NULL,
GUC_EXPLAIN
},
&enable_parallel_hash,
true,
@ -1028,7 +1044,8 @@ static struct config_bool ConfigureNamesBool[] =
gettext_noop("Enable plan-time and run-time partition pruning."),
gettext_noop("Allows the query planner and executor to compare partition "
"bounds to conditions in the query to determine which "
"partitions must be scanned.")
"partitions must be scanned."),
GUC_EXPLAIN
},
&enable_partition_pruning,
true,
@ -1038,7 +1055,8 @@ static struct config_bool ConfigureNamesBool[] =
{"geqo", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("Enables genetic query optimization."),
gettext_noop("This algorithm attempts to do planning without "
"exhaustive searching.")
"exhaustive searching."),
GUC_EXPLAIN
},
&enable_geqo,
true,
@ -1646,7 +1664,7 @@ static struct config_bool ConfigureNamesBool[] =
"optimize_bounded_sort", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enable bounded sorting using heap sort."),
NULL,
GUC_NOT_IN_SAMPLE
GUC_NOT_IN_SAMPLE | GUC_EXPLAIN
},
&optimize_bounded_sort,
true,
@ -1837,7 +1855,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"parallel_leader_participation", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
gettext_noop("Controls whether Gather and Gather Merge also run subplans."),
gettext_noop("Should gather nodes also run subplans, or just gather tuples?")
gettext_noop("Should gather nodes also run subplans, or just gather tuples?"),
GUC_EXPLAIN
},
&parallel_leader_participation,
true,
@ -1847,7 +1866,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"jit", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Allow JIT compilation."),
NULL
NULL,
GUC_EXPLAIN
},
&jit_enabled,
true,
@ -1976,7 +1996,8 @@ static struct config_int ConfigureNamesInt[] =
"are not collapsed."),
gettext_noop("The planner will merge subqueries into upper "
"queries if the resulting FROM list would have no more than "
"this many items.")
"this many items."),
GUC_EXPLAIN
},
&from_collapse_limit,
8, 1, INT_MAX,
@ -1988,7 +2009,8 @@ static struct config_int ConfigureNamesInt[] =
"constructs are not flattened."),
gettext_noop("The planner will flatten explicit JOIN "
"constructs into lists of FROM items whenever a "
"list of no more than this many items would result.")
"list of no more than this many items would result."),
GUC_EXPLAIN
},
&join_collapse_limit,
8, 1, INT_MAX,
@ -1997,7 +2019,8 @@ static struct config_int ConfigureNamesInt[] =
{
{"geqo_threshold", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("Sets the threshold of FROM items beyond which GEQO is used."),
NULL
NULL,
GUC_EXPLAIN
},
&geqo_threshold,
12, 2, INT_MAX,
@ -2006,7 +2029,8 @@ static struct config_int ConfigureNamesInt[] =
{
{"geqo_effort", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("GEQO: effort is used to set the default for other GEQO parameters."),
NULL
NULL,
GUC_EXPLAIN
},
&Geqo_effort,
DEFAULT_GEQO_EFFORT, MIN_GEQO_EFFORT, MAX_GEQO_EFFORT,
@ -2015,7 +2039,8 @@ static struct config_int ConfigureNamesInt[] =
{
{"geqo_pool_size", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("GEQO: number of individuals in the population."),
gettext_noop("Zero selects a suitable default value.")
gettext_noop("Zero selects a suitable default value."),
GUC_EXPLAIN
},
&Geqo_pool_size,
0, 0, INT_MAX,
@ -2024,7 +2049,8 @@ static struct config_int ConfigureNamesInt[] =
{
{"geqo_generations", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("GEQO: number of iterations of the algorithm."),
gettext_noop("Zero selects a suitable default value.")
gettext_noop("Zero selects a suitable default value."),
GUC_EXPLAIN
},
&Geqo_generations,
0, 0, INT_MAX,
@ -2138,7 +2164,7 @@ static struct config_int ConfigureNamesInt[] =
{"temp_buffers", PGC_USERSET, RESOURCES_MEM,
gettext_noop("Sets the maximum number of temporary buffers used by each session."),
NULL,
GUC_UNIT_BLOCKS
GUC_UNIT_BLOCKS | GUC_EXPLAIN
},
&num_temp_buffers,
1024, 100, INT_MAX / 2,
@ -2205,7 +2231,7 @@ static struct config_int ConfigureNamesInt[] =
gettext_noop("This much memory can be used by each internal "
"sort operation and hash table before switching to "
"temporary disk files."),
GUC_UNIT_KB
GUC_UNIT_KB | GUC_EXPLAIN
},
&work_mem,
4096, 64, MAX_KILOBYTES,
@ -2734,7 +2760,8 @@ static struct config_int ConfigureNamesInt[] =
PGC_USERSET,
RESOURCES_ASYNCHRONOUS,
gettext_noop("Number of simultaneous requests that can be handled efficiently by the disk subsystem."),
gettext_noop("For RAID arrays, this should be approximately the number of drive spindles in the array.")
gettext_noop("For RAID arrays, this should be approximately the number of drive spindles in the array."),
GUC_EXPLAIN
},
&effective_io_concurrency,
#ifdef USE_PREFETCH
@ -2979,7 +3006,8 @@ static struct config_int ConfigureNamesInt[] =
{
{"max_parallel_workers_per_gather", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
gettext_noop("Sets the maximum number of parallel processes per executor node."),
NULL
NULL,
GUC_EXPLAIN
},
&max_parallel_workers_per_gather,
2, 0, MAX_PARALLEL_WORKER_LIMIT,
@ -2989,7 +3017,8 @@ static struct config_int ConfigureNamesInt[] =
{
{"max_parallel_workers", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
gettext_noop("Sets the maximum number of parallel workers that can be active at one time."),
NULL
NULL,
GUC_EXPLAIN
},
&max_parallel_workers,
8, 0, MAX_PARALLEL_WORKER_LIMIT,
@ -3079,7 +3108,7 @@ static struct config_int ConfigureNamesInt[] =
gettext_noop("Sets the planner's assumption about the total size of the data caches."),
gettext_noop("That is, the total size of the caches (kernel cache and shared buffers) used for PostgreSQL data files. "
"This is measured in disk pages, which are normally 8 kB each."),
GUC_UNIT_BLOCKS,
GUC_UNIT_BLOCKS | GUC_EXPLAIN,
},
&effective_cache_size,
DEFAULT_EFFECTIVE_CACHE_SIZE, 1, INT_MAX,
@ -3090,7 +3119,7 @@ static struct config_int ConfigureNamesInt[] =
{"min_parallel_table_scan_size", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the minimum amount of table data for a parallel scan."),
gettext_noop("If the planner estimates that it will read a number of table pages too small to reach this limit, a parallel scan will not be considered."),
GUC_UNIT_BLOCKS,
GUC_UNIT_BLOCKS | GUC_EXPLAIN,
},
&min_parallel_table_scan_size,
(8 * 1024 * 1024) / BLCKSZ, 0, INT_MAX / 3,
@ -3101,7 +3130,7 @@ static struct config_int ConfigureNamesInt[] =
{"min_parallel_index_scan_size", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the minimum amount of index data for a parallel scan."),
gettext_noop("If the planner estimates that it will read a number of index pages too small to reach this limit, a parallel scan will not be considered."),
GUC_UNIT_BLOCKS,
GUC_UNIT_BLOCKS | GUC_EXPLAIN,
},
&min_parallel_index_scan_size,
(512 * 1024) / BLCKSZ, 0, INT_MAX / 3,
@ -3166,7 +3195,8 @@ static struct config_real ConfigureNamesReal[] =
{"seq_page_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of a "
"sequentially fetched disk page."),
NULL
NULL,
GUC_EXPLAIN
},
&seq_page_cost,
DEFAULT_SEQ_PAGE_COST, 0, DBL_MAX,
@ -3176,7 +3206,8 @@ static struct config_real ConfigureNamesReal[] =
{"random_page_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of a "
"nonsequentially fetched disk page."),
NULL
NULL,
GUC_EXPLAIN
},
&random_page_cost,
DEFAULT_RANDOM_PAGE_COST, 0, DBL_MAX,
@ -3186,7 +3217,8 @@ static struct config_real ConfigureNamesReal[] =
{"cpu_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of "
"processing each tuple (row)."),
NULL
NULL,
GUC_EXPLAIN
},
&cpu_tuple_cost,
DEFAULT_CPU_TUPLE_COST, 0, DBL_MAX,
@ -3196,7 +3228,8 @@ static struct config_real ConfigureNamesReal[] =
{"cpu_index_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of "
"processing each index entry during an index scan."),
NULL
NULL,
GUC_EXPLAIN
},
&cpu_index_tuple_cost,
DEFAULT_CPU_INDEX_TUPLE_COST, 0, DBL_MAX,
@ -3206,7 +3239,8 @@ static struct config_real ConfigureNamesReal[] =
{"cpu_operator_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of "
"processing each operator or function call."),
NULL
NULL,
GUC_EXPLAIN
},
&cpu_operator_cost,
DEFAULT_CPU_OPERATOR_COST, 0, DBL_MAX,
@ -3216,7 +3250,8 @@ static struct config_real ConfigureNamesReal[] =
{"parallel_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of "
"passing each tuple (row) from worker to master backend."),
NULL
NULL,
GUC_EXPLAIN
},
&parallel_tuple_cost,
DEFAULT_PARALLEL_TUPLE_COST, 0, DBL_MAX,
@ -3226,7 +3261,8 @@ static struct config_real ConfigureNamesReal[] =
{"parallel_setup_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of "
"starting up worker processes for parallel query."),
NULL
NULL,
GUC_EXPLAIN
},
&parallel_setup_cost,
DEFAULT_PARALLEL_SETUP_COST, 0, DBL_MAX,
@ -3236,7 +3272,8 @@ static struct config_real ConfigureNamesReal[] =
{
{"jit_above_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Perform JIT compilation if query is more expensive."),
gettext_noop("-1 disables JIT compilation.")
gettext_noop("-1 disables JIT compilation."),
GUC_EXPLAIN
},
&jit_above_cost,
100000, -1, DBL_MAX,
@ -3246,7 +3283,8 @@ static struct config_real ConfigureNamesReal[] =
{
{"jit_optimize_above_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Optimize JITed functions if query is more expensive."),
gettext_noop("-1 disables optimization.")
gettext_noop("-1 disables optimization."),
GUC_EXPLAIN
},
&jit_optimize_above_cost,
500000, -1, DBL_MAX,
@ -3256,7 +3294,8 @@ static struct config_real ConfigureNamesReal[] =
{
{"jit_inline_above_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Perform JIT inlining if query is more expensive."),
gettext_noop("-1 disables inlining.")
gettext_noop("-1 disables inlining."),
GUC_EXPLAIN
},
&jit_inline_above_cost,
500000, -1, DBL_MAX,
@ -3267,7 +3306,8 @@ static struct config_real ConfigureNamesReal[] =
{"cursor_tuple_fraction", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Sets the planner's estimate of the fraction of "
"a cursor's rows that will be retrieved."),
NULL
NULL,
GUC_EXPLAIN
},
&cursor_tuple_fraction,
DEFAULT_CURSOR_TUPLE_FRACTION, 0.0, 1.0,
@ -3277,7 +3317,8 @@ static struct config_real ConfigureNamesReal[] =
{
{"geqo_selection_bias", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("GEQO: selective pressure within the population."),
NULL
NULL,
GUC_EXPLAIN
},
&Geqo_selection_bias,
DEFAULT_GEQO_SELECTION_BIAS,
@ -3287,7 +3328,8 @@ static struct config_real ConfigureNamesReal[] =
{
{"geqo_seed", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("GEQO: seed for random path selection."),
NULL
NULL,
GUC_EXPLAIN
},
&Geqo_seed,
0.0, 0.0, 1.0,
@ -3747,7 +3789,7 @@ static struct config_string ConfigureNamesString[] =
{"search_path", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the schema search order for names that are not schema-qualified."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE
GUC_LIST_INPUT | GUC_LIST_QUOTE | GUC_EXPLAIN
},
&namespace_search_path,
"\"$user\", public",
@ -4200,7 +4242,8 @@ static struct config_enum ConfigureNamesEnum[] =
{"constraint_exclusion", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Enables the planner to use constraints to optimize queries."),
gettext_noop("Table scans will be skipped if their constraints"
" guarantee that no rows match the query.")
" guarantee that no rows match the query."),
GUC_EXPLAIN
},
&constraint_exclusion,
CONSTRAINT_EXCLUSION_PARTITION, constraint_exclusion_options,
@ -4436,7 +4479,8 @@ static struct config_enum ConfigureNamesEnum[] =
{
{"force_parallel_mode", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Forces use of parallel query facilities."),
gettext_noop("If possible, run query using a parallel worker and with parallel restrictions.")
gettext_noop("If possible, run query using a parallel worker and with parallel restrictions."),
GUC_EXPLAIN
},
&force_parallel_mode,
FORCE_PARALLEL_OFF, force_parallel_mode_options,
@ -4460,7 +4504,8 @@ static struct config_enum ConfigureNamesEnum[] =
gettext_noop("Controls the planner's selection of custom or generic plan."),
gettext_noop("Prepared statements can have custom and generic plans, and the planner "
"will attempt to choose which is better. This can be set to override "
"the default behavior.")
"the default behavior."),
GUC_EXPLAIN
},
&plan_cache_mode,
PLAN_CACHE_MODE_AUTO, plan_cache_mode_options,
@ -4521,6 +4566,9 @@ static struct config_generic **guc_variables;
/* Current number of variables contained in the vector */
static int num_guc_variables;
/* Current number of variables marked with GUC_EXPLAIN */
static int num_guc_explain_variables;
/* Vector capacity */
static int size_guc_variables;
@ -4784,6 +4832,7 @@ build_guc_variables(void)
{
int size_vars;
int num_vars = 0;
int num_explain_vars = 0;
struct config_generic **guc_vars;
int i;
@ -4794,6 +4843,9 @@ build_guc_variables(void)
/* Rather than requiring vartype to be filled in by hand, do this: */
conf->gen.vartype = PGC_BOOL;
num_vars++;
if (conf->gen.flags & GUC_EXPLAIN)
num_explain_vars++;
}
for (i = 0; ConfigureNamesInt[i].gen.name; i++)
@ -4802,6 +4854,9 @@ build_guc_variables(void)
conf->gen.vartype = PGC_INT;
num_vars++;
if (conf->gen.flags & GUC_EXPLAIN)
num_explain_vars++;
}
for (i = 0; ConfigureNamesReal[i].gen.name; i++)
@ -4810,6 +4865,9 @@ build_guc_variables(void)
conf->gen.vartype = PGC_REAL;
num_vars++;
if (conf->gen.flags & GUC_EXPLAIN)
num_explain_vars++;
}
for (i = 0; ConfigureNamesString[i].gen.name; i++)
@ -4818,6 +4876,9 @@ build_guc_variables(void)
conf->gen.vartype = PGC_STRING;
num_vars++;
if (conf->gen.flags & GUC_EXPLAIN)
num_explain_vars++;
}
for (i = 0; ConfigureNamesEnum[i].gen.name; i++)
@ -4826,6 +4887,9 @@ build_guc_variables(void)
conf->gen.vartype = PGC_ENUM;
num_vars++;
if (conf->gen.flags & GUC_EXPLAIN)
num_explain_vars++;
}
/*
@ -4857,6 +4921,7 @@ build_guc_variables(void)
free(guc_variables);
guc_variables = guc_vars;
num_guc_variables = num_vars;
num_guc_explain_variables = num_explain_vars;
size_guc_variables = size_vars;
qsort((void *) guc_variables, num_guc_variables,
sizeof(struct config_generic *), guc_var_compare);
@ -8807,6 +8872,99 @@ ShowAllGUCConfig(DestReceiver *dest)
end_tup_output(tstate);
}
/*
* Returns an array of modified GUC options to show in EXPLAIN. Only options
* related to query planning (marked with GUC_EXPLAIN), with values different
* from built-in defaults.
*/
struct config_generic **
get_explain_guc_options(int *num)
{
int i;
struct config_generic **result;
*num = 0;
/*
* Allocate enough space to fit all GUC_EXPLAIN options. We may not
* need all the space, but there are fairly few such options so we
* don't waste a lot of memory.
*/
result = palloc(sizeof(struct config_generic *) * num_guc_explain_variables);
for (i = 0; i < num_guc_variables; i++)
{
bool modified;
struct config_generic *conf = guc_variables[i];
/* return only options visible to the user */
if ((conf->flags & GUC_NO_SHOW_ALL) ||
((conf->flags & GUC_SUPERUSER_ONLY) &&
!is_member_of_role(GetUserId(), DEFAULT_ROLE_READ_ALL_SETTINGS)))
continue;
/* only parameters explicitly marked for inclusion in explain */
if (!(conf->flags & GUC_EXPLAIN))
continue;
/* return only options that were modified (w.r.t. config file) */
modified = false;
switch (conf->vartype)
{
case PGC_BOOL:
{
struct config_bool *lconf = (struct config_bool *) conf;
modified = (lconf->boot_val != *(lconf->variable));
}
break;
case PGC_INT:
{
struct config_int *lconf = (struct config_int *) conf;
modified = (lconf->boot_val != *(lconf->variable));
}
break;
case PGC_REAL:
{
struct config_real *lconf = (struct config_real *) conf;
modified = (lconf->boot_val != *(lconf->variable));
}
break;
case PGC_STRING:
{
struct config_string *lconf = (struct config_string *) conf;
modified = (strcmp(lconf->boot_val, *(lconf->variable)) != 0);
}
break;
case PGC_ENUM:
{
struct config_enum *lconf = (struct config_enum *) conf;
modified = (lconf->boot_val != *(lconf->variable));
}
break;
default:
elog(ERROR, "unexcpected GUC type: %d", conf->vartype);
}
/* skip GUC variables that match the built-in default */
if (!modified)
continue;
/* assign to the values array */
result[*num] = conf;
*num = *num + 1;
Assert(*num <= num_guc_explain_variables);
}
return result;
}
/*
* Return GUC variable value by name; optionally return canonical form of
* name. If the GUC is unset, then throw an error unless missing_ok is true,

1
src/include/commands/explain.h
View File

@ -35,6 +35,7 @@ typedef struct ExplainState
bool buffers; /* print buffer usage */
bool timing; /* print detailed node timing */
bool summary; /* print total planning and execution timing */
bool settings; /* print modified settings */
ExplainFormat format; /* output format */
/* state for output formatting --- not reset for each new plan tree */
int indent; /* current indentation level */

2
src/include/utils/guc.h
View File

@ -227,6 +227,8 @@ typedef enum
#define GUC_UNIT_MIN 0x30000 /* value is in minutes */
#define GUC_UNIT_TIME 0xF0000 /* mask for time-related units */
#define GUC_EXPLAIN 0x100000 /* include in explain */
#define GUC_UNIT (GUC_UNIT_MEMORY | GUC_UNIT_TIME)

1
src/include/utils/guc_tables.h
View File

@ -267,5 +267,6 @@ extern void build_guc_variables(void);
extern const char *config_enum_lookup_by_value(struct config_enum *record, int val);
extern bool config_enum_lookup_by_name(struct config_enum *record,
const char *value, int *retval);
extern struct config_generic **get_explain_guc_options(int *num);
#endif /* GUC_TABLES_H */