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Commit0b03e59

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Introduce custom path and scan providers.
This allows extension modules to define their own methods forscanning a relation, and get the core code to use them. It'sunclear as yet how much use this capability will find, but wewon't find out if we never commit it.KaiGai Kohei, reviewed at various times and in various levelsof detail by Shigeru Hanada, Tom Lane, Andres Freund, ÁlvaroHerrera, and myself.
1 parent7250d85 commit0b03e59

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22 files changed

+638
-10
lines changed

22 files changed

+638
-10
lines changed

‎src/backend/commands/explain.c‎

Lines changed: 25 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -724,6 +724,7 @@ ExplainPreScanNode(PlanState *planstate, Bitmapset **rels_used)
724724
caseT_CteScan:
725725
caseT_WorkTableScan:
726726
caseT_ForeignScan:
727+
caseT_CustomScan:
727728
*rels_used=bms_add_member(*rels_used,
728729
((Scan*)plan)->scanrelid);
729730
break;
@@ -853,6 +854,7 @@ ExplainNode(PlanState *planstate, List *ancestors,
853854
constchar*sname;/* node type name for non-text output */
854855
constchar*strategy=NULL;
855856
constchar*operation=NULL;
857+
constchar*custom_name=NULL;
856858
intsave_indent=es->indent;
857859
boolhaschildren;
858860

@@ -941,6 +943,14 @@ ExplainNode(PlanState *planstate, List *ancestors,
941943
caseT_ForeignScan:
942944
pname=sname="Foreign Scan";
943945
break;
946+
caseT_CustomScan:
947+
sname="Custom Scan";
948+
custom_name= ((CustomScan*)plan)->methods->CustomName;
949+
if (custom_name)
950+
pname=psprintf("Custom Scan (%s)",custom_name);
951+
else
952+
pname=sname;
953+
break;
944954
caseT_Material:
945955
pname=sname="Materialize";
946956
break;
@@ -1042,6 +1052,8 @@ ExplainNode(PlanState *planstate, List *ancestors,
10421052
ExplainPropertyText("Parent Relationship",relationship,es);
10431053
if (plan_name)
10441054
ExplainPropertyText("Subplan Name",plan_name,es);
1055+
if (custom_name)
1056+
ExplainPropertyText("Custom Plan Provider",custom_name,es);
10451057
}
10461058

10471059
switch (nodeTag(plan))
@@ -1055,6 +1067,7 @@ ExplainNode(PlanState *planstate, List *ancestors,
10551067
caseT_CteScan:
10561068
caseT_WorkTableScan:
10571069
caseT_ForeignScan:
1070+
caseT_CustomScan:
10581071
ExplainScanTarget((Scan*)plan,es);
10591072
break;
10601073
caseT_IndexScan:
@@ -1358,6 +1371,18 @@ ExplainNode(PlanState *planstate, List *ancestors,
13581371
planstate,es);
13591372
show_foreignscan_info((ForeignScanState*)planstate,es);
13601373
break;
1374+
caseT_CustomScan:
1375+
{
1376+
CustomScanState*css= (CustomScanState*)planstate;
1377+
1378+
show_scan_qual(plan->qual,"Filter",planstate,ancestors,es);
1379+
if (plan->qual)
1380+
show_instrumentation_count("Rows Removed by Filter",1,
1381+
planstate,es);
1382+
if (css->methods->ExplainCustomScan)
1383+
css->methods->ExplainCustomScan(css,ancestors,es);
1384+
}
1385+
break;
13611386
caseT_NestLoop:
13621387
show_upper_qual(((NestLoop*)plan)->join.joinqual,
13631388
"Join Filter",planstate,ancestors,es);

‎src/backend/executor/Makefile‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -16,7 +16,7 @@ OBJS = execAmi.o execCurrent.o execGrouping.o execJunk.o execMain.o \
1616
execProcnode.o execQual.o execScan.o execTuples.o\
1717
execUtils.o functions.o instrument.o nodeAppend.o nodeAgg.o\
1818
nodeBitmapAnd.o nodeBitmapOr.o\
19-
nodeBitmapHeapscan.o nodeBitmapIndexscan.o nodeHash.o\
19+
nodeBitmapHeapscan.o nodeBitmapIndexscan.onodeCustom.onodeHash.o\
2020
nodeHashjoin.o nodeIndexscan.o nodeIndexonlyscan.o\
2121
nodeLimit.o nodeLockRows.o\
2222
nodeMaterial.o nodeMergeAppend.o nodeMergejoin.o nodeModifyTable.o\

‎src/backend/executor/execAmi.c‎

Lines changed: 36 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -21,6 +21,7 @@
2121
#include"executor/nodeBitmapIndexscan.h"
2222
#include"executor/nodeBitmapOr.h"
2323
#include"executor/nodeCtescan.h"
24+
#include"executor/nodeCustom.h"
2425
#include"executor/nodeForeignscan.h"
2526
#include"executor/nodeFunctionscan.h"
2627
#include"executor/nodeGroup.h"
@@ -49,6 +50,7 @@
4950
#include"executor/nodeWindowAgg.h"
5051
#include"executor/nodeWorktablescan.h"
5152
#include"nodes/nodeFuncs.h"
53+
#include"nodes/relation.h"
5254
#include"utils/rel.h"
5355
#include"utils/syscache.h"
5456

@@ -197,6 +199,10 @@ ExecReScan(PlanState *node)
197199
ExecReScanForeignScan((ForeignScanState*)node);
198200
break;
199201

202+
caseT_CustomScanState:
203+
ExecReScanCustomScan((CustomScanState*)node);
204+
break;
205+
200206
caseT_NestLoopState:
201207
ExecReScanNestLoop((NestLoopState*)node);
202208
break;
@@ -291,6 +297,10 @@ ExecMarkPos(PlanState *node)
291297
ExecValuesMarkPos((ValuesScanState*)node);
292298
break;
293299

300+
caseT_CustomScanState:
301+
ExecCustomMarkPos((CustomScanState*)node);
302+
break;
303+
294304
caseT_MaterialState:
295305
ExecMaterialMarkPos((MaterialState*)node);
296306
break;
@@ -348,6 +358,10 @@ ExecRestrPos(PlanState *node)
348358
ExecValuesRestrPos((ValuesScanState*)node);
349359
break;
350360

361+
caseT_CustomScanState:
362+
ExecCustomRestrPos((CustomScanState*)node);
363+
break;
364+
351365
caseT_MaterialState:
352366
ExecMaterialRestrPos((MaterialState*)node);
353367
break;
@@ -379,9 +393,9 @@ ExecRestrPos(PlanState *node)
379393
* and valuesscan support is actually useless code at present.)
380394
*/
381395
bool
382-
ExecSupportsMarkRestore(NodeTagplantype)
396+
ExecSupportsMarkRestore(Path*pathnode)
383397
{
384-
switch (plantype)
398+
switch (pathnode->pathtype)
385399
{
386400
caseT_SeqScan:
387401
caseT_IndexScan:
@@ -403,6 +417,16 @@ ExecSupportsMarkRestore(NodeTag plantype)
403417
*/
404418
return false;
405419

420+
caseT_CustomScan:
421+
{
422+
CustomPath*cpath= (CustomPath*)pathnode;
423+
424+
Assert(IsA(cpath,CustomPath));
425+
if (cpath->flags&CUSTOMPATH_SUPPORT_MARK_RESTORE)
426+
return true;
427+
}
428+
break;
429+
406430
default:
407431
break;
408432
}
@@ -465,6 +489,16 @@ ExecSupportsBackwardScan(Plan *node)
465489
returnExecSupportsBackwardScan(((SubqueryScan*)node)->subplan)&&
466490
TargetListSupportsBackwardScan(node->targetlist);
467491

492+
caseT_CustomScan:
493+
{
494+
uint32flags= ((CustomScan*)node)->flags;
495+
496+
if (TargetListSupportsBackwardScan(node->targetlist)&&
497+
(flags&CUSTOMPATH_SUPPORT_BACKWARD_SCAN)!=0)
498+
return true;
499+
}
500+
return false;
501+
468502
caseT_Material:
469503
caseT_Sort:
470504
/* these don't evaluate tlist */

‎src/backend/executor/execProcnode.c‎

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -85,6 +85,7 @@
8585
#include"executor/nodeBitmapIndexscan.h"
8686
#include"executor/nodeBitmapOr.h"
8787
#include"executor/nodeCtescan.h"
88+
#include"executor/nodeCustom.h"
8889
#include"executor/nodeForeignscan.h"
8990
#include"executor/nodeFunctionscan.h"
9091
#include"executor/nodeGroup.h"
@@ -244,6 +245,11 @@ ExecInitNode(Plan *node, EState *estate, int eflags)
244245
estate,eflags);
245246
break;
246247

248+
caseT_CustomScan:
249+
result= (PlanState*)ExecInitCustomScan((CustomScan*)node,
250+
estate,eflags);
251+
break;
252+
247253
/*
248254
* join nodes
249255
*/
@@ -442,6 +448,10 @@ ExecProcNode(PlanState *node)
442448
result=ExecForeignScan((ForeignScanState*)node);
443449
break;
444450

451+
caseT_CustomScanState:
452+
result=ExecCustomScan((CustomScanState*)node);
453+
break;
454+
445455
/*
446456
* join nodes
447457
*/
@@ -678,6 +688,10 @@ ExecEndNode(PlanState *node)
678688
ExecEndForeignScan((ForeignScanState*)node);
679689
break;
680690

691+
caseT_CustomScanState:
692+
ExecEndCustomScan((CustomScanState*)node);
693+
break;
694+
681695
/*
682696
* join nodes
683697
*/

‎src/backend/executor/nodeCustom.c‎

Lines changed: 126 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,126 @@
1+
/* ------------------------------------------------------------------------
2+
*
3+
* nodeCustom.c
4+
*Routines to handle execution of custom scan node
5+
*
6+
* Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
7+
* Portions Copyright (c) 1994, Regents of the University of California
8+
*
9+
* ------------------------------------------------------------------------
10+
*/
11+
#include"postgres.h"
12+
13+
#include"executor/executor.h"
14+
#include"executor/nodeCustom.h"
15+
#include"nodes/execnodes.h"
16+
#include"nodes/plannodes.h"
17+
#include"parser/parsetree.h"
18+
#include"utils/hsearch.h"
19+
#include"utils/memutils.h"
20+
#include"utils/rel.h"
21+
22+
CustomScanState*
23+
ExecInitCustomScan(CustomScan*cscan,EState*estate,inteflags)
24+
{
25+
CustomScanState*css;
26+
Relationscan_rel;
27+
28+
/* populate a CustomScanState according to the CustomScan */
29+
css= (CustomScanState*)cscan->methods->CreateCustomScanState(cscan);
30+
Assert(IsA(css,CustomScanState));
31+
32+
/* fill up fields of ScanState */
33+
css->ss.ps.plan=&cscan->scan.plan;
34+
css->ss.ps.state=estate;
35+
36+
/* create expression context for node */
37+
ExecAssignExprContext(estate,&css->ss.ps);
38+
39+
/* initialize child expressions */
40+
css->ss.ps.targetlist= (List*)
41+
ExecInitExpr((Expr*)cscan->scan.plan.targetlist,
42+
(PlanState*)css);
43+
css->ss.ps.qual= (List*)
44+
ExecInitExpr((Expr*)cscan->scan.plan.qual,
45+
(PlanState*)css);
46+
47+
/* tuple table initialization */
48+
ExecInitScanTupleSlot(estate,&css->ss);
49+
ExecInitResultTupleSlot(estate,&css->ss.ps);
50+
51+
/* initialize scan relation */
52+
scan_rel=ExecOpenScanRelation(estate,cscan->scan.scanrelid,eflags);
53+
css->ss.ss_currentRelation=scan_rel;
54+
css->ss.ss_currentScanDesc=NULL;/* set by provider */
55+
ExecAssignScanType(&css->ss,RelationGetDescr(scan_rel));
56+
57+
css->ss.ps.ps_TupFromTlist= false;
58+
59+
/*
60+
* Initialize result tuple type and projection info.
61+
*/
62+
ExecAssignResultTypeFromTL(&css->ss.ps);
63+
ExecAssignScanProjectionInfo(&css->ss);
64+
65+
/*
66+
* The callback of custom-scan provider applies the final initialization
67+
* of the custom-scan-state node according to its logic.
68+
*/
69+
css->methods->BeginCustomScan(css,estate,eflags);
70+
71+
returncss;
72+
}
73+
74+
TupleTableSlot*
75+
ExecCustomScan(CustomScanState*node)
76+
{
77+
Assert(node->methods->ExecCustomScan!=NULL);
78+
returnnode->methods->ExecCustomScan(node);
79+
}
80+
81+
void
82+
ExecEndCustomScan(CustomScanState*node)
83+
{
84+
Assert(node->methods->EndCustomScan!=NULL);
85+
node->methods->EndCustomScan(node);
86+
87+
/* Free the exprcontext */
88+
ExecFreeExprContext(&node->ss.ps);
89+
90+
/* Clean out the tuple table */
91+
ExecClearTuple(node->ss.ps.ps_ResultTupleSlot);
92+
if (node->ss.ss_ScanTupleSlot)
93+
ExecClearTuple(node->ss.ss_ScanTupleSlot);
94+
95+
/* Close the heap relation */
96+
ExecCloseScanRelation(node->ss.ss_currentRelation);
97+
}
98+
99+
void
100+
ExecReScanCustomScan(CustomScanState*node)
101+
{
102+
Assert(node->methods->ReScanCustomScan!=NULL);
103+
node->methods->ReScanCustomScan(node);
104+
}
105+
106+
void
107+
ExecCustomMarkPos(CustomScanState*node)
108+
{
109+
if (!node->methods->MarkPosCustomScan)
110+
ereport(ERROR,
111+
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
112+
errmsg("custom-scan \"%s\" does not support MarkPos",
113+
node->methods->CustomName)));
114+
node->methods->MarkPosCustomScan(node);
115+
}
116+
117+
void
118+
ExecCustomRestrPos(CustomScanState*node)
119+
{
120+
if (!node->methods->RestrPosCustomScan)
121+
ereport(ERROR,
122+
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
123+
errmsg("custom-scan \"%s\" does not support MarkPos",
124+
node->methods->CustomName)));
125+
node->methods->RestrPosCustomScan(node);
126+
}

‎src/backend/nodes/copyfuncs.c‎

Lines changed: 26 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -597,6 +597,29 @@ _copyForeignScan(const ForeignScan *from)
597597
returnnewnode;
598598
}
599599

600+
/*
601+
* _copyCustomScan
602+
*/
603+
staticCustomScan*
604+
_copyCustomScan(constCustomScan*from)
605+
{
606+
CustomScan*newnode;
607+
608+
newnode=from->methods->CopyCustomScan(from);
609+
Assert(nodeTag(newnode)==nodeTag(from));
610+
611+
CopyScanFields((constScan*)from, (Scan*)newnode);
612+
COPY_SCALAR_FIELD(flags);
613+
/*
614+
* NOTE: The method field of CustomScan is required to be a pointer
615+
* to a static table of callback functions. So, we don't copy the
616+
* table itself, just reference the original one.
617+
*/
618+
COPY_SCALAR_FIELD(methods);
619+
620+
returnnewnode;
621+
}
622+
600623
/*
601624
* CopyJoinFields
602625
*
@@ -4043,6 +4066,9 @@ copyObject(const void *from)
40434066
caseT_ForeignScan:
40444067
retval=_copyForeignScan(from);
40454068
break;
4069+
caseT_CustomScan:
4070+
retval=_copyCustomScan(from);
4071+
break;
40464072
caseT_Join:
40474073
retval=_copyJoin(from);
40484074
break;

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