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Make EXPLAIN MERGE output format more compact 

We can use a single line to print all tuple counts that MERGE processed,
for conciseness, and elide those that are zeroes.  Non-text formats
report all numbers, as is typical.

Per comment from Justin Pryzby <pryzby@telsasoft.com>

Discussion: https://postgr.es/m/20220511163350.GL19626@telsasoft.com
This commit is contained in:
Alvaro Herrera 2022-05-18 18:33:04 +02:00
parent 81e3c83d98
commit 598ac10be1
No known key found for this signature in database
GPG Key ID: 1C20ACB9D5C564AE
2 changed files with 31 additions and 29 deletions
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25
src/backend/commands/explain.c
View File

@ -4068,10 +4068,27 @@ show_modifytable_info(ModifyTableState *mtstate, List *ancestors,
skipped_path = total - insert_path - update_path - delete_path;
Assert(skipped_path >= 0);
ExplainPropertyFloat("Tuples Inserted", NULL, insert_path, 0, es);
ExplainPropertyFloat("Tuples Updated", NULL, update_path, 0, es);
ExplainPropertyFloat("Tuples Deleted", NULL, delete_path, 0, es);
ExplainPropertyFloat("Tuples Skipped", NULL, skipped_path, 0, es);
if (es->format == EXPLAIN_FORMAT_TEXT && total > 0)
{
ExplainIndentText(es);
appendStringInfoString(es->str, "Tuples:");
if (insert_path > 0)
appendStringInfo(es->str, " inserted=%.0f", insert_path);
if (update_path > 0)
appendStringInfo(es->str, " updated=%.0f", update_path);
if (delete_path > 0)
appendStringInfo(es->str, " deleted=%.0f", delete_path);
if (skipped_path > 0)
appendStringInfo(es->str, " skipped=%.0f", skipped_path);
appendStringInfoChar(es->str, '\n');
}
else
{
ExplainPropertyFloat("Tuples Inserted", NULL, insert_path, 0, es);
ExplainPropertyFloat("Tuples Updated", NULL, update_path, 0, es);
ExplainPropertyFloat("Tuples Deleted", NULL, delete_path, 0, es);
ExplainPropertyFloat("Tuples Skipped", NULL, skipped_path, 0, es);
}
}
}

35
src/test/regress/expected/merge.out
View File

@ -1329,10 +1329,7 @@ WHEN MATCHED THEN
explain_merge
----------------------------------------------------------------------
Merge on ex_mtarget t (actual rows=0 loops=1)
Tuples Inserted: 0
Tuples Updated: 50
Tuples Deleted: 0
Tuples Skipped: 0
Tuples: updated=50
-> Merge Join (actual rows=50 loops=1)
Merge Cond: (t.a = s.a)
-> Sort (actual rows=50 loops=1)
@ -1343,7 +1340,7 @@ WHEN MATCHED THEN
Sort Key: s.a
Sort Method: quicksort Memory: xxx
-> Seq Scan on ex_msource s (actual rows=100 loops=1)
(15 rows)
(12 rows)
-- only updates to selected tuples
SELECT explain_merge('
@ -1353,10 +1350,7 @@ WHEN MATCHED AND t.a < 10 THEN
explain_merge
----------------------------------------------------------------------
Merge on ex_mtarget t (actual rows=0 loops=1)
Tuples Inserted: 0
Tuples Updated: 5
Tuples Deleted: 0
Tuples Skipped: 45
Tuples: updated=5 skipped=45
-> Merge Join (actual rows=50 loops=1)
Merge Cond: (t.a = s.a)
-> Sort (actual rows=50 loops=1)
@ -1367,7 +1361,7 @@ WHEN MATCHED AND t.a < 10 THEN
Sort Key: s.a
Sort Method: quicksort Memory: xxx
-> Seq Scan on ex_msource s (actual rows=100 loops=1)
(15 rows)
(12 rows)
-- updates + deletes
SELECT explain_merge('
@ -1379,10 +1373,7 @@ WHEN MATCHED AND t.a >= 10 AND t.a <= 20 THEN
explain_merge
----------------------------------------------------------------------
Merge on ex_mtarget t (actual rows=0 loops=1)
Tuples Inserted: 0
Tuples Updated: 5
Tuples Deleted: 5
Tuples Skipped: 40
Tuples: updated=5 deleted=5 skipped=40
-> Merge Join (actual rows=50 loops=1)
Merge Cond: (t.a = s.a)
-> Sort (actual rows=50 loops=1)
@ -1393,7 +1384,7 @@ WHEN MATCHED AND t.a >= 10 AND t.a <= 20 THEN
Sort Key: s.a
Sort Method: quicksort Memory: xxx
-> Seq Scan on ex_msource s (actual rows=100 loops=1)
(15 rows)
(12 rows)
-- only inserts
SELECT explain_merge('
@ -1403,10 +1394,7 @@ WHEN NOT MATCHED AND s.a < 10 THEN
explain_merge
----------------------------------------------------------------------
Merge on ex_mtarget t (actual rows=0 loops=1)
Tuples Inserted: 4
Tuples Updated: 0
Tuples Deleted: 0
Tuples Skipped: 96
Tuples: inserted=4 skipped=96
-> Merge Left Join (actual rows=100 loops=1)
Merge Cond: (s.a = t.a)
-> Sort (actual rows=100 loops=1)
@ -1417,7 +1405,7 @@ WHEN NOT MATCHED AND s.a < 10 THEN
Sort Key: t.a
Sort Method: quicksort Memory: xxx
-> Seq Scan on ex_mtarget t (actual rows=45 loops=1)
(15 rows)
(12 rows)
-- all three
SELECT explain_merge('
@ -1431,10 +1419,7 @@ WHEN NOT MATCHED AND s.a < 20 THEN
explain_merge
----------------------------------------------------------------------
Merge on ex_mtarget t (actual rows=0 loops=1)
Tuples Inserted: 10
Tuples Updated: 9
Tuples Deleted: 5
Tuples Skipped: 76
Tuples: inserted=10 updated=9 deleted=5 skipped=76
-> Merge Left Join (actual rows=100 loops=1)
Merge Cond: (s.a = t.a)
-> Sort (actual rows=100 loops=1)
@ -1445,7 +1430,7 @@ WHEN NOT MATCHED AND s.a < 20 THEN
Sort Key: t.a
Sort Method: quicksort Memory: xxx
-> Seq Scan on ex_mtarget t (actual rows=49 loops=1)
(15 rows)
(12 rows)
DROP TABLE ex_msource, ex_mtarget;
DROP FUNCTION explain_merge(text);