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TABLESAMPLE, SQL Standard and extensible

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Add a TABLESAMPLE clause to SELECT statements that allows
user to specify random BERNOULLI sampling or block level
SYSTEM sampling. Implementation allows for extensible
sampling functions to be written, using a standard API.
Basic version follows SQLStandard exactly. Usable
concrete use cases for the sampling API follow in later
commits.

Petr Jelinek

Reviewed by Michael Paquier and Simon Riggs
This commit is contained in:
Simon Riggs
2015-05-15 14:37:10 -04:00
parent 11a83bbedd
commit f6d208d6e5
66 changed files with 2756 additions and 40 deletions
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69
src/backend/optimizer/plan/createplan.c
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@@ -59,6 +59,8 @@ static Material *create_material_plan(PlannerInfo *root, MaterialPath *best_path
static Plan *create_unique_plan(PlannerInfo *root, UniquePath *best_path);
static SeqScan *create_seqscan_plan(PlannerInfo *root, Path *best_path,
List *tlist, List *scan_clauses);
static SampleScan *create_samplescan_plan(PlannerInfo *root, Path *best_path,
List *tlist, List *scan_clauses);
static Scan *create_indexscan_plan(PlannerInfo *root, IndexPath *best_path,
List *tlist, List *scan_clauses, bool indexonly);
static BitmapHeapScan *create_bitmap_scan_plan(PlannerInfo *root,
@@ -101,6 +103,7 @@ static List *order_qual_clauses(PlannerInfo *root, List *clauses);
static void copy_path_costsize(Plan *dest, Path *src);
static void copy_plan_costsize(Plan *dest, Plan *src);
static SeqScan *make_seqscan(List *qptlist, List *qpqual, Index scanrelid);
static SampleScan *make_samplescan(List *qptlist, List *qpqual, Index scanrelid);
static IndexScan *make_indexscan(List *qptlist, List *qpqual, Index scanrelid,
Oid indexid, List *indexqual, List *indexqualorig,
List *indexorderby, List *indexorderbyorig, Oid *indexorderbyops,
@@ -229,6 +232,7 @@ create_plan_recurse(PlannerInfo *root, Path *best_path)
switch (best_path->pathtype)
{
case T_SeqScan:
case T_SampleScan:
case T_IndexScan:
case T_IndexOnlyScan:
case T_BitmapHeapScan:
@@ -344,6 +348,13 @@ create_scan_plan(PlannerInfo *root, Path *best_path)
scan_clauses);
break;
case T_SampleScan:
plan = (Plan *) create_samplescan_plan(root,
best_path,
tlist,
scan_clauses);
break;
case T_IndexScan:
plan = (Plan *) create_indexscan_plan(root,
(IndexPath *) best_path,
@@ -547,6 +558,7 @@ disuse_physical_tlist(PlannerInfo *root, Plan *plan, Path *path)
switch (path->pathtype)
{
case T_SeqScan:
case T_SampleScan:
case T_IndexScan:
case T_IndexOnlyScan:
case T_BitmapHeapScan:
@@ -1133,6 +1145,45 @@ create_seqscan_plan(PlannerInfo *root, Path *best_path,
return scan_plan;
}
/*
* create_samplescan_plan
* Returns a samplecan plan for the base relation scanned by 'best_path'
* with restriction clauses 'scan_clauses' and targetlist 'tlist'.
*/
static SampleScan *
create_samplescan_plan(PlannerInfo *root, Path *best_path,
List *tlist, List *scan_clauses)
{
SampleScan *scan_plan;
Index scan_relid = best_path->parent->relid;
/* it should be a base rel with tablesample clause... */
Assert(scan_relid > 0);
Assert(best_path->parent->rtekind == RTE_RELATION);
Assert(best_path->pathtype == T_SampleScan);
/* Sort clauses into best execution order */
scan_clauses = order_qual_clauses(root, scan_clauses);
/* Reduce RestrictInfo list to bare expressions; ignore pseudoconstants */
scan_clauses = extract_actual_clauses(scan_clauses, false);
/* Replace any outer-relation variables with nestloop params */
if (best_path->param_info)
{
scan_clauses = (List *)
replace_nestloop_params(root, (Node *) scan_clauses);
}
scan_plan = make_samplescan(tlist,
scan_clauses,
scan_relid);
copy_path_costsize(&scan_plan->plan, best_path);
return scan_plan;
}
/*
* create_indexscan_plan
* Returns an indexscan plan for the base relation scanned by 'best_path'
@@ -3378,6 +3429,24 @@ make_seqscan(List *qptlist,
return node;
}
static SampleScan *
make_samplescan(List *qptlist,
List *qpqual,
Index scanrelid)
{
SampleScan *node = makeNode(SampleScan);
Plan *plan = &node->plan;
/* cost should be inserted by caller */
plan->targetlist = qptlist;
plan->qual = qpqual;
plan->lefttree = NULL;
plan->righttree = NULL;
node->scanrelid = scanrelid;
return node;
}
static IndexScan *
make_indexscan(List *qptlist,
List *qpqual,