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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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41
src/backend/nodes/outfuncs.c
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@ -24,6 +24,7 @@
#include <ctype.h>
#include "lib/stringinfo.h"
#include "foreign/fdwapi.h"
#include "nodes/plannodes.h"
#include "nodes/relation.h"
#include "utils/datum.h"
@ -537,6 +538,27 @@ _outWorkTableScan(StringInfo str, WorkTableScan *node)
WRITE_INT_FIELD(wtParam);
}
static void
_outForeignScan(StringInfo str, ForeignScan *node)
{
WRITE_NODE_TYPE("FOREIGNSCAN");
_outScanInfo(str, (Scan *) node);
WRITE_BOOL_FIELD(fsSystemCol);
WRITE_NODE_FIELD(fdwplan);
}
static void
_outFdwPlan(StringInfo str, FdwPlan *node)
{
WRITE_NODE_TYPE("FDWPLAN");
WRITE_FLOAT_FIELD(startup_cost, "%.2f");
WRITE_FLOAT_FIELD(total_cost, "%.2f");
WRITE_NODE_FIELD(fdw_private);
}
static void
_outJoin(StringInfo str, Join *node)
{
@ -1507,6 +1529,16 @@ _outTidPath(StringInfo str, TidPath *node)
WRITE_NODE_FIELD(tidquals);
}
static void
_outForeignPath(StringInfo str, ForeignPath *node)
{
WRITE_NODE_TYPE("FOREIGNPATH");
_outPathInfo(str, (Path *) node);
WRITE_NODE_FIELD(fdwplan);
}
static void
_outAppendPath(StringInfo str, AppendPath *node)
{
@ -2672,6 +2704,12 @@ _outNode(StringInfo str, void *obj)
case T_WorkTableScan:
_outWorkTableScan(str, obj);
break;
case T_ForeignScan:
_outForeignScan(str, obj);
break;
case T_FdwPlan:
_outFdwPlan(str, obj);
break;
case T_Join:
_outJoin(str, obj);
break;
@ -2877,6 +2915,9 @@ _outNode(StringInfo str, void *obj)
case T_TidPath:
_outTidPath(str, obj);
break;
case T_ForeignPath:
_outForeignPath(str, obj);
break;
case T_AppendPath:
_outAppendPath(str, obj);
break;