pgsql: Allow setting sample ratio for auto_explain

Allow setting sample ratio for auto_explain

New configuration parameter auto_explain.sample_ratio makes it
possible to log just a fraction of the queries meeting the configured
threshold, to reduce the amount of logging.

Author: Craig Ringer and Julien Rouhaud
Review: Petr Jelinek

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/92f03fe76fe6be683a8b7497579158b8a82b2c25

Modified Files
--------------
contrib/auto_explain/auto_explain.c | 31 ++++++++++++++++++++++++++++---
doc/src/sgml/auto-explain.sgml | 18 ++++++++++++++++++
2 files changed, 46 insertions(+), 3 deletions(-)

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