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Commit d22782a

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tvondratvondra
committed
Minor improvements in Incremental Sort explain
Some places still used "Maximum" instead of "Peak" when displaying info about sort space, so fix that. Also, add a comment clarifying why it's correct to check the number of full/prefix sort groups. Author: James Coleman Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com
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‎src/backend/commands/explain.c

Copy file name to clipboardExpand all lines: src/backend/commands/explain.c
+18-2Lines changed: 18 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -2841,7 +2841,7 @@ show_incremental_sort_group_info(IncrementalSortGroupInfo *groupInfo,
28412841
ExplainOpenGroup("Sort Space", memoryName.data, true, es);
28422842

28432843
ExplainPropertyInteger("Average Sort Space Used", "kB", avgSpace, es);
2844-
ExplainPropertyInteger("Maximum Sort Space Used", "kB",
2844+
ExplainPropertyInteger("Peak Sort Space Used", "kB",
28452845
groupInfo->maxMemorySpaceUsed, es);
28462846

28472847
ExplainCloseGroup("Sort Spaces", memoryName.data, true, es);
@@ -2858,7 +2858,7 @@ show_incremental_sort_group_info(IncrementalSortGroupInfo *groupInfo,
28582858
ExplainOpenGroup("Sort Space", diskName.data, true, es);
28592859

28602860
ExplainPropertyInteger("Average Sort Space Used", "kB", avgSpace, es);
2861-
ExplainPropertyInteger("Maximum Sort Space Used", "kB",
2861+
ExplainPropertyInteger("Peak Sort Space Used", "kB",
28622862
groupInfo->maxDiskSpaceUsed, es);
28632863

28642864
ExplainCloseGroup("Sort Spaces", diskName.data, true, es);
@@ -2883,6 +2883,15 @@ show_incremental_sort_info(IncrementalSortState *incrsortstate,
28832883
if (!es->analyze)
28842884
return;
28852885

2886+
/*
2887+
* Since we never have any prefix groups unless we've first sorted a full
2888+
* groups and transitioned modes (copying the tuples into a prefix group),
2889+
* we don't need to do anything if there were 0 full groups.
2890+
*
2891+
* We still have to continue after this block if there are no full groups,
2892+
* though, since it's possible that we have workers that did real work even
2893+
* if the leader didn't participate.
2894+
*/
28862895
if (fullsortGroupInfo->groupCount > 0)
28872896
{
28882897
show_incremental_sort_group_info(fullsortGroupInfo, "Full-sort", true, es);
@@ -2914,6 +2923,13 @@ show_incremental_sort_info(IncrementalSortState *incrsortstate,
29142923
*/
29152924
fullsortGroupInfo = &incsort_info->fullsortGroupInfo;
29162925
prefixsortGroupInfo = &incsort_info->prefixsortGroupInfo;
2926+
2927+
/*
2928+
* Since we never have any prefix groups unless we've first sorted
2929+
* a full groups and transitioned modes (copying the tuples into a
2930+
* prefix group), we don't need to do anything if there were 0 full
2931+
* groups.
2932+
*/
29172933
if (fullsortGroupInfo->groupCount == 0 &&
29182934
prefixsortGroupInfo->groupCount == 0)
29192935
continue;

‎src/test/regress/expected/incremental_sort.out

Copy file name to clipboardExpand all lines: src/test/regress/expected/incremental_sort.out
+67-67Lines changed: 67 additions & 67 deletions
Original file line numberDiff line numberDiff line change
@@ -109,7 +109,7 @@ begin
109109
for group_key in select unnest(array['Full-sort Groups', 'Presorted Groups']::text[]) t loop
110110
for space_key in select unnest(array['Sort Space Memory', 'Sort Space Disk']::text[]) t loop
111111
node := jsonb_set(node, array[group_key, space_key, 'Average Sort Space Used'], '"NN"', false);
112-
node := jsonb_set(node, array[group_key, space_key, 'Maximum Sort Space Used'], '"NN"', false);
112+
node := jsonb_set(node, array[group_key, space_key, 'Peak Sort Space Used'], '"NN"', false);
113113
end loop;
114114
end loop;
115115
nodes := nodes || node;
@@ -131,7 +131,7 @@ begin
131131
for group_key in select unnest(array['Full-sort Groups', 'Presorted Groups']::text[]) t loop
132132
group_stats := node->group_key;
133133
for space_key in select unnest(array['Sort Space Memory', 'Sort Space Disk']::text[]) t loop
134-
if (group_stats->space_key->'Maximum Sort Space Used')::bigint < (group_stats->space_key->'Maximum Sort Space Used')::bigint then
134+
if (group_stats->space_key->'Peak Sort Space Used')::bigint < (group_stats->space_key->'Peak Sort Space Used')::bigint then
135135
raise exception '% has invalid max space < average space', group_key;
136136
end if;
137137
end loop;
@@ -545,34 +545,34 @@ select explain_analyze_without_memory('select * from (select * from t order by a
545545
(9 rows)
546546

547547
select jsonb_pretty(explain_analyze_inc_sort_nodes_without_memory('select * from (select * from t order by a) s order by a, b limit 55'));
548-
jsonb_pretty
549-
--------------------------------------------------
550-
[ +
551-
{ +
552-
"Sort Key": [ +
553-
"t.a", +
554-
"t.b" +
555-
], +
556-
"Node Type": "Incremental Sort", +
557-
"Actual Rows": 55, +
558-
"Actual Loops": 1, +
559-
"Presorted Key": [ +
560-
"t.a" +
561-
], +
562-
"Parallel Aware": false, +
563-
"Full-sort Groups": { +
564-
"Group Count": 2, +
565-
"Sort Methods Used": [ +
566-
"top-N heapsort", +
567-
"quicksort" +
568-
], +
569-
"Sort Space Memory": { +
570-
"Average Sort Space Used": "NN",+
571-
"Maximum Sort Space Used": "NN" +
572-
} +
573-
}, +
574-
"Parent Relationship": "Outer" +
575-
} +
548+
jsonb_pretty
549+
-------------------------------------------------
550+
[ +
551+
{ +
552+
"Sort Key": [ +
553+
"t.a", +
554+
"t.b" +
555+
], +
556+
"Node Type": "Incremental Sort", +
557+
"Actual Rows": 55, +
558+
"Actual Loops": 1, +
559+
"Presorted Key": [ +
560+
"t.a" +
561+
], +
562+
"Parallel Aware": false, +
563+
"Full-sort Groups": { +
564+
"Group Count": 2, +
565+
"Sort Methods Used": [ +
566+
"top-N heapsort", +
567+
"quicksort" +
568+
], +
569+
"Sort Space Memory": { +
570+
"Peak Sort Space Used": "NN", +
571+
"Average Sort Space Used": "NN"+
572+
} +
573+
}, +
574+
"Parent Relationship": "Outer" +
575+
} +
576576
]
577577
(1 row)
578578

@@ -719,43 +719,43 @@ select explain_analyze_without_memory('select * from (select * from t order by a
719719
(9 rows)
720720

721721
select jsonb_pretty(explain_analyze_inc_sort_nodes_without_memory('select * from (select * from t order by a) s order by a, b limit 70'));
722-
jsonb_pretty
723-
--------------------------------------------------
724-
[ +
725-
{ +
726-
"Sort Key": [ +
727-
"t.a", +
728-
"t.b" +
729-
], +
730-
"Node Type": "Incremental Sort", +
731-
"Actual Rows": 70, +
732-
"Actual Loops": 1, +
733-
"Presorted Key": [ +
734-
"t.a" +
735-
], +
736-
"Parallel Aware": false, +
737-
"Full-sort Groups": { +
738-
"Group Count": 1, +
739-
"Sort Methods Used": [ +
740-
"quicksort" +
741-
], +
742-
"Sort Space Memory": { +
743-
"Average Sort Space Used": "NN",+
744-
"Maximum Sort Space Used": "NN" +
745-
} +
746-
}, +
747-
"Presorted Groups": { +
748-
"Group Count": 5, +
749-
"Sort Methods Used": [ +
750-
"quicksort" +
751-
], +
752-
"Sort Space Memory": { +
753-
"Average Sort Space Used": "NN",+
754-
"Maximum Sort Space Used": "NN" +
755-
} +
756-
}, +
757-
"Parent Relationship": "Outer" +
758-
} +
722+
jsonb_pretty
723+
-------------------------------------------------
724+
[ +
725+
{ +
726+
"Sort Key": [ +
727+
"t.a", +
728+
"t.b" +
729+
], +
730+
"Node Type": "Incremental Sort", +
731+
"Actual Rows": 70, +
732+
"Actual Loops": 1, +
733+
"Presorted Key": [ +
734+
"t.a" +
735+
], +
736+
"Parallel Aware": false, +
737+
"Full-sort Groups": { +
738+
"Group Count": 1, +
739+
"Sort Methods Used": [ +
740+
"quicksort" +
741+
], +
742+
"Sort Space Memory": { +
743+
"Peak Sort Space Used": "NN", +
744+
"Average Sort Space Used": "NN"+
745+
} +
746+
}, +
747+
"Presorted Groups": { +
748+
"Group Count": 5, +
749+
"Sort Methods Used": [ +
750+
"quicksort" +
751+
], +
752+
"Sort Space Memory": { +
753+
"Peak Sort Space Used": "NN", +
754+
"Average Sort Space Used": "NN"+
755+
} +
756+
}, +
757+
"Parent Relationship": "Outer" +
758+
} +
759759
]
760760
(1 row)
761761

‎src/test/regress/sql/incremental_sort.sql

Copy file name to clipboardExpand all lines: src/test/regress/sql/incremental_sort.sql
+2-2Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -85,7 +85,7 @@ begin
8585
for group_key in select unnest(array['Full-sort Groups', 'Presorted Groups']::text[]) t loop
8686
for space_key in select unnest(array['Sort Space Memory', 'Sort Space Disk']::text[]) t loop
8787
node := jsonb_set(node, array[group_key, space_key, 'Average Sort Space Used'], '"NN"', false);
88-
node := jsonb_set(node, array[group_key, space_key, 'Maximum Sort Space Used'], '"NN"', false);
88+
node := jsonb_set(node, array[group_key, space_key, 'Peak Sort Space Used'], '"NN"', false);
8989
end loop;
9090
end loop;
9191
nodes := nodes || node;
@@ -108,7 +108,7 @@ begin
108108
for group_key in select unnest(array['Full-sort Groups', 'Presorted Groups']::text[]) t loop
109109
group_stats := node->group_key;
110110
for space_key in select unnest(array['Sort Space Memory', 'Sort Space Disk']::text[]) t loop
111-
if (group_stats->space_key->'Maximum Sort Space Used')::bigint < (group_stats->space_key->'Maximum Sort Space Used')::bigint then
111+
if (group_stats->space_key->'Peak Sort Space Used')::bigint < (group_stats->space_key->'Peak Sort Space Used')::bigint then
112112
raise exception '% has invalid max space < average space', group_key;
113113
end if;
114114
end loop;

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