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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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18
src/backend/parser/analyze.c
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@ -40,6 +40,7 @@
#include "parser/parse_target.h"
#include "parser/parsetree.h"
#include "rewrite/rewriteManip.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
@ -2176,9 +2177,14 @@ transformLockingClause(ParseState *pstate, Query *qry, LockingClause *lc,
switch (rte->rtekind)
{
case RTE_RELATION:
applyLockingClause(qry, i,
lc->forUpdate, lc->noWait, pushedDown);
rte->requiredPerms |= ACL_SELECT_FOR_UPDATE;
/* ignore foreign tables */
if (get_rel_relkind(rte->relid) != RELKIND_FOREIGN_TABLE)
{
applyLockingClause(qry, i,
lc->forUpdate, lc->noWait,
pushedDown);
rte->requiredPerms |= ACL_SELECT_FOR_UPDATE;
}
break;
case RTE_SUBQUERY:
applyLockingClause(qry, i,
@ -2225,6 +2231,12 @@ transformLockingClause(ParseState *pstate, Query *qry, LockingClause *lc,
switch (rte->rtekind)
{
case RTE_RELATION:
if (get_rel_relkind(rte->relid) == RELKIND_FOREIGN_TABLE)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SELECT FOR UPDATE/SHARE cannot be used with foreign table \"%s\"",
get_rel_name(rte->relid)),
parser_errposition(pstate, thisrel->location)));
applyLockingClause(qry, i,
lc->forUpdate, lc->noWait,
pushedDown);