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Introduce custom path and scan providers.

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This allows extension modules to define their own methods for
scanning a relation, and get the core code to use them.  It's
unclear as yet how much use this capability will find, but we
won't find out if we never commit it.

KaiGai Kohei, reviewed at various times and in various levels
of detail by Shigeru Hanada, Tom Lane, Andres Freund, Álvaro
Herrera, and myself.
This commit is contained in:
Robert Haas
2014-11-07 17:26:02 -05:00
parent 7250d8535b
commit 0b03e5951b
22 changed files with 638 additions and 10 deletions
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25
src/backend/commands/explain.c
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@ -724,6 +724,7 @@ ExplainPreScanNode(PlanState *planstate, Bitmapset **rels_used)
case T_CteScan:
case T_WorkTableScan:
case T_ForeignScan:
case T_CustomScan:
*rels_used = bms_add_member(*rels_used,
((Scan *) plan)->scanrelid);
break;
@ -853,6 +854,7 @@ ExplainNode(PlanState *planstate, List *ancestors,
const char *sname; /* node type name for non-text output */
const char *strategy = NULL;
const char *operation = NULL;
const char *custom_name = NULL;
int save_indent = es->indent;
bool haschildren;
@ -941,6 +943,14 @@ ExplainNode(PlanState *planstate, List *ancestors,
case T_ForeignScan:
pname = sname = "Foreign Scan";
break;
case T_CustomScan:
sname = "Custom Scan";
custom_name = ((CustomScan *) plan)->methods->CustomName;
if (custom_name)
pname = psprintf("Custom Scan (%s)", custom_name);
else
pname = sname;
break;
case T_Material:
pname = sname = "Materialize";
break;
@ -1042,6 +1052,8 @@ ExplainNode(PlanState *planstate, List *ancestors,
ExplainPropertyText("Parent Relationship", relationship, es);
if (plan_name)
ExplainPropertyText("Subplan Name", plan_name, es);
if (custom_name)
ExplainPropertyText("Custom Plan Provider", custom_name, es);
}
switch (nodeTag(plan))
@ -1055,6 +1067,7 @@ ExplainNode(PlanState *planstate, List *ancestors,
case T_CteScan:
case T_WorkTableScan:
case T_ForeignScan:
case T_CustomScan:
ExplainScanTarget((Scan *) plan, es);
break;
case T_IndexScan:
@ -1358,6 +1371,18 @@ ExplainNode(PlanState *planstate, List *ancestors,
planstate, es);
show_foreignscan_info((ForeignScanState *) planstate, es);
break;
case T_CustomScan:
{
CustomScanState *css = (CustomScanState *) planstate;
show_scan_qual(plan->qual, "Filter", planstate, ancestors, es);
if (plan->qual)
show_instrumentation_count("Rows Removed by Filter", 1,
planstate, es);
if (css->methods->ExplainCustomScan)
css->methods->ExplainCustomScan(css, ancestors, es);
}
break;
case T_NestLoop:
show_upper_qual(((NestLoop *) plan)->join.joinqual,
"Join Filter", planstate, ancestors, es);