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Improve EXPLAIN to print the grouping columns in Agg and Group nodes.

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Per request from Kevin Grittner.
This commit is contained in:
Tom Lane
2013-12-12 11:24:38 -05:00
parent 8693559cac
commit f26099057a
6 changed files with 92 additions and 30 deletions
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13
doc/src/sgml/ref/explain.sgml
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@ -395,13 +395,14 @@ PREPARE query(int, int) AS SELECT sum(bar) FROM test
EXPLAIN ANALYZE EXECUTE query(100, 200);
QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------
HashAggregate (cost=39.53..39.53 rows=1 width=8) (actual time=0.661..0.672 rows=7 loops=1)
-> Index Scan using test_pkey on test (cost=0.00..32.97 rows=1311 width=8) (actual time=0.050..0.395 rows=99 loops=1)
QUERY PLAN
------------------------------------------------------------------------------------------------------------------------
HashAggregate (cost=9.54..9.54 rows=1 width=8) (actual time=0.156..0.161 rows=11 loops=1)
Group Key: foo
-> Index Scan using test_pkey on test (cost=0.29..9.29 rows=50 width=8) (actual time=0.039..0.091 rows=99 loops=1)
Index Cond: ((id > $1) AND (id < $2))
Total runtime: 0.851 ms
(4 rows)
Total runtime: 0.225 ms
(5 rows)
</programlisting>
</para>