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Implement an API to let foreign-data wrappers actually be functional.

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This commit provides the core code and documentation needed.  A contrib
module test case will follow shortly.

Shigeru Hanada, Jan Urbanski, Heikki Linnakangas
This commit is contained in:
Tom Lane
2011-02-20 00:17:18 -05:00
parent d5813488a4
commit bb74240794
39 changed files with 1202 additions and 62 deletions
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51
src/backend/commands/explain.c
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@ -22,6 +22,7 @@
#include "commands/trigger.h"
#include "executor/hashjoin.h"
#include "executor/instrument.h"
#include "foreign/fdwapi.h"
#include "optimizer/clauses.h"
#include "optimizer/planner.h"
#include "optimizer/var.h"
@ -80,25 +81,15 @@ static void show_sort_keys_common(PlanState *planstate,
List *ancestors, ExplainState *es);
static void show_sort_info(SortState *sortstate, ExplainState *es);
static void show_hash_info(HashState *hashstate, ExplainState *es);
static void show_foreignscan_info(ForeignScanState *fsstate, ExplainState *es);
static const char *explain_get_index_name(Oid indexId);
static void ExplainScanTarget(Scan *plan, ExplainState *es);
static void ExplainMemberNodes(List *plans, PlanState **planstates,
List *ancestors, ExplainState *es);
static void ExplainSubPlans(List *plans, List *ancestors,
const char *relationship, ExplainState *es);
static void ExplainPropertyList(const char *qlabel, List *data,
ExplainState *es);
static void ExplainProperty(const char *qlabel, const char *value,
bool numeric, ExplainState *es);
#define ExplainPropertyText(qlabel, value, es) \
ExplainProperty(qlabel, value, false, es)
static void ExplainPropertyInteger(const char *qlabel, int value,
ExplainState *es);
static void ExplainPropertyLong(const char *qlabel, long value,
ExplainState *es);
static void ExplainPropertyFloat(const char *qlabel, double value, int ndigits,
ExplainState *es);
static void ExplainOpenGroup(const char *objtype, const char *labelname,
bool labeled, ExplainState *es);
static void ExplainCloseGroup(const char *objtype, const char *labelname,
@ -705,6 +696,9 @@ ExplainNode(PlanState *planstate, List *ancestors,
case T_WorkTableScan:
pname = sname = "WorkTable Scan";
break;
case T_ForeignScan:
pname = sname = "Foreign Scan";
break;
case T_Material:
pname = sname = "Materialize";
break;
@ -854,6 +848,7 @@ ExplainNode(PlanState *planstate, List *ancestors,
case T_ValuesScan:
case T_CteScan:
case T_WorkTableScan:
case T_ForeignScan:
ExplainScanTarget((Scan *) plan, es);
break;
case T_BitmapIndexScan:
@ -1057,6 +1052,10 @@ ExplainNode(PlanState *planstate, List *ancestors,
show_scan_qual(plan->qual, "Filter", planstate, ancestors, es);
}
break;
case T_ForeignScan:
show_scan_qual(plan->qual, "Filter", planstate, ancestors, es);
show_foreignscan_info((ForeignScanState *) planstate, es);
break;
case T_NestLoop:
show_upper_qual(((NestLoop *) plan)->join.joinqual,
"Join Filter", planstate, ancestors, es);
@ -1523,6 +1522,18 @@ show_hash_info(HashState *hashstate, ExplainState *es)
}
}
/*
* Show extra information for a ForeignScan node.
*/
static void
show_foreignscan_info(ForeignScanState *fsstate, ExplainState *es)
{
FdwRoutine *fdwroutine = fsstate->fdwroutine;
/* Let the FDW emit whatever fields it wants */
fdwroutine->ExplainForeignScan(fsstate, es);
}
/*
* Fetch the name of an index in an EXPLAIN
*
@ -1570,6 +1581,7 @@ ExplainScanTarget(Scan *plan, ExplainState *es)
case T_IndexScan:
case T_BitmapHeapScan:
case T_TidScan:
case T_ForeignScan:
/* Assert it's on a real relation */
Assert(rte->rtekind == RTE_RELATION);
objectname = get_rel_name(rte->relid);
@ -1695,7 +1707,7 @@ ExplainSubPlans(List *plans, List *ancestors,
* Explain a property, such as sort keys or targets, that takes the form of
* a list of unlabeled items. "data" is a list of C strings.
*/
static void
void
ExplainPropertyList(const char *qlabel, List *data, ExplainState *es)
{
ListCell *lc;
@ -1817,10 +1829,19 @@ ExplainProperty(const char *qlabel, const char *value, bool numeric,
}
}
/*
* Explain a string-valued property.
*/
void
ExplainPropertyText(const char *qlabel, const char *value, ExplainState *es)
{
ExplainProperty(qlabel, value, false, es);
}
/*
* Explain an integer-valued property.
*/
static void
void
ExplainPropertyInteger(const char *qlabel, int value, ExplainState *es)
{
char buf[32];
@ -1832,7 +1853,7 @@ ExplainPropertyInteger(const char *qlabel, int value, ExplainState *es)
/*
* Explain a long-integer-valued property.
*/
static void
void
ExplainPropertyLong(const char *qlabel, long value, ExplainState *es)
{
char buf[32];
@ -1845,7 +1866,7 @@ ExplainPropertyLong(const char *qlabel, long value, ExplainState *es)
* Explain a float-valued property, using the specified number of
* fractional digits.
*/
static void
void
ExplainPropertyFloat(const char *qlabel, double value, int ndigits,
ExplainState *es)
{