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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2018-12-17 11:44:19 -0300 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2018-12-17 11:44:19 -0300 |
| commit | f760a8b5cc1fa8c9d341faaf2cbda3b94d5a20d9 (patch) | |
| tree | 9af9bcb46f94a8f10e11390afd948281d07ea8db | |
| parent | f88dd4fa43b4edf4fb906e95c55a706d9508021b (diff) | |
Clarify runtime pruning in EXPLAIN
Author: Amit Langote
Reviewed-by: David Rowley
Discussion: https://postgr.es/m/002dec69-9afb-b621-5630-235eceafe0bd@lab.ntt.co.jp
| -rw-r--r-- | doc/src/sgml/ddl.sgml | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml index 5ae3cacbf0e..5e5c3d7057b 100644 --- a/doc/src/sgml/ddl.sgml +++ b/doc/src/sgml/ddl.sgml @@ -3921,8 +3921,12 @@ EXPLAIN SELECT count(*) FROM measurement WHERE logdate >= DATE '2008-01-01'; query, partition pruning is performed whenever one of the execution parameters being used by partition pruning changes. Determining if partitions were pruned during this phase requires - careful inspection of the <literal>nloops</literal> property in - the <command>EXPLAIN ANALYZE</command> output. + careful inspection of the <literal>loops</literal> property in + the <command>EXPLAIN ANALYZE</command> output. Subplans + corresponding to different partitions may have different values + for it depending on how many times each of them was pruned during + execution. Some may be shown as <literal>(never executed)</literal> + if they were pruned every time. </para> </listitem> </itemizedlist> |