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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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44
src/backend/nodes/copyfuncs.c
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@ -23,6 +23,7 @@
#include "postgres.h"
#include "miscadmin.h"
#include "foreign/fdwapi.h"
#include "nodes/plannodes.h"
#include "nodes/relation.h"
#include "utils/datum.h"
@ -549,6 +550,43 @@ _copyWorkTableScan(WorkTableScan *from)
return newnode;
}
/*
* _copyForeignScan
*/
static ForeignScan *
_copyForeignScan(ForeignScan *from)
{
ForeignScan *newnode = makeNode(ForeignScan);
/*
* copy node superclass fields
*/
CopyScanFields((Scan *) from, (Scan *) newnode);
/*
* copy remainder of node
*/
COPY_SCALAR_FIELD(fsSystemCol);
COPY_NODE_FIELD(fdwplan);
return newnode;
}
/*
* _copyFdwPlan
*/
static FdwPlan *
_copyFdwPlan(FdwPlan *from)
{
FdwPlan *newnode = makeNode(FdwPlan);
COPY_SCALAR_FIELD(startup_cost);
COPY_SCALAR_FIELD(total_cost);
COPY_NODE_FIELD(fdw_private);
return newnode;
}
/*
* CopyJoinFields
*
@ -3839,6 +3877,12 @@ copyObject(void *from)
case T_WorkTableScan:
retval = _copyWorkTableScan(from);
break;
case T_ForeignScan:
retval = _copyForeignScan(from);
break;
case T_FdwPlan:
retval = _copyFdwPlan(from);
break;
case T_Join:
retval = _copyJoin(from);
break;