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Collect and use multi-column dependency stats

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Follow on patch in the multi-variate statistics patch series.

CREATE STATISTICS s1 WITH (dependencies) ON (a, b) FROM t;
ANALYZE;
will collect dependency stats on (a, b) and then use the measured
dependency in subsequent query planning.

Commit 7b504eb282 added
CREATE STATISTICS with n-distinct coefficients. These are now
specified using the mutually exclusive option WITH (ndistinct).

Author: Tomas Vondra, David Rowley
Reviewed-by: Kyotaro HORIGUCHI, Álvaro Herrera, Dean Rasheed, Robert Haas
and many other comments and contributions
Discussion: https://postgr.es/m/56f40b20-c464-fad2-ff39-06b668fac47c@2ndquadrant.com
This commit is contained in:
Simon Riggs
2017-04-05 18:00:42 -04:00
parent 00b6b6feb1
commit 2686ee1b7c
31 changed files with 2035 additions and 79 deletions
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20
src/backend/utils/adt/selfuncs.c
View File

@@ -1633,13 +1633,17 @@ booltestsel(PlannerInfo *root, BoolTestType booltesttype, Node *arg,
case IS_NOT_FALSE:
selec = (double) clause_selectivity(root, arg,
varRelid,
jointype, sjinfo);
jointype,
sjinfo,
NULL);
break;
case IS_FALSE:
case IS_NOT_TRUE:
selec = 1.0 - (double) clause_selectivity(root, arg,
varRelid,
jointype, sjinfo);
jointype,
sjinfo,
NULL);
break;
default:
elog(ERROR, "unrecognized booltesttype: %d",
@@ -6436,7 +6440,8 @@ genericcostestimate(PlannerInfo *root,
indexSelectivity = clauselist_selectivity(root, selectivityQuals,
index->rel->relid,
JOIN_INNER,
NULL);
NULL,
index->rel);
/*
* If caller didn't give us an estimate, estimate the number of index
@@ -6757,7 +6762,8 @@ btcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
btreeSelectivity = clauselist_selectivity(root, selectivityQuals,
index->rel->relid,
JOIN_INNER,
NULL);
NULL,
index->rel);
numIndexTuples = btreeSelectivity * index->rel->tuples;
/*
@@ -7516,7 +7522,8 @@ gincostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
*indexSelectivity = clauselist_selectivity(root, selectivityQuals,
index->rel->relid,
JOIN_INNER,
NULL);
NULL,
index->rel);
/* fetch estimated page cost for tablespace containing index */
get_tablespace_page_costs(index->reltablespace,
@@ -7748,7 +7755,8 @@ brincostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
*indexSelectivity =
clauselist_selectivity(root, indexQuals,
path->indexinfo->rel->relid,
JOIN_INNER, NULL);
JOIN_INNER, NULL,
path->indexinfo->rel);
*indexCorrelation = 1;
/*