/* ----------------------------------------------------------------
* ExecIndexOnlyMarkPos
*
* Note: we assume that no caller attempts to set a mark before having read
* at least one tuple. Otherwise, ioss_ScanDesc might still be NULL.
* ----------------------------------------------------------------
*/
void
ExecIndexOnlyMarkPos(IndexOnlyScanState *node)
{
EState *estate = node->ss.ps.state;
if (estate->es_epqTuple != NULL)
{
/*
* We are inside an EvalPlanQual recheck. If a test tuple exists for
* this relation, then we shouldn't access the index at all. We would
* instead need to save, and later restore, the state of the
* es_epqScanDone flag, so that re-fetching the test tuple is
* possible. However, given the assumption that no caller sets a mark
* at the start of the scan, we can only get here with es_epqScanDone
* already set, and so no state need be saved.
*/
Index scanrelid = ((Scan *) node->ss.ps.plan)->scanrelid;
Assert(scanrelid > 0);
if (estate->es_epqTupleSet[scanrelid - 1])
{
/* Verify the claim above */
if (!estate->es_epqScanDone[scanrelid - 1])
elog(ERROR, "unexpected ExecIndexOnlyMarkPos call in EPQ recheck");
return;
}
}
index_markpos(node->ioss_ScanDesc);
}
/* ----------------------------------------------------------------
* ExecIndexMarkPos
* ----------------------------------------------------------------
*/
void
ExecIndexMarkPos(IndexScanState *node)
{
index_markpos(node->iss_ScanDesc);
}
/* ----------------------------------------------------------------
* ExecIndexOnlyMarkPos
* ----------------------------------------------------------------
*/
void
ExecIndexOnlyMarkPos(IndexOnlyScanState *node)
{
index_markpos(node->ioss_ScanDesc);
}
/* ----------------------------------------------------------------
* ExecIndexMarkPos
* ----------------------------------------------------------------
*/
void
ExecIndexMarkPos(index_ss *node)
{
index_markpos(node->iss_ScanDesc);
}