/*
* During EagerFree ShareInputScan decrements the
* reference count in ShareNodeEntry when its intra-slice share node.
* The reference count tells the underlying Material/Sort node not to free
* too eagerly as this node still needs to read its tuples. Once this node
* is freed, the underlying node can free its content.
* We consider this reference counter only in intra-slice cases, because
* inter-slice share nodes have their own pointer to the buffer and
* there is not way to tell this reference over Motions anyway.
*/
void
ExecEagerFreeShareInputScan(ShareInputScanState *node)
{
/*
* no need to call tuplestore end. Underlying ShareInput will take
* care of releasing tuplestore resources
*/
/*
* XXX Do we need to pfree the tuplestore_state and pos?
* XXX nodeMaterial.c does not, need to find out why
*/
ShareInputScan * sisc = (ShareInputScan *) node->ss.ps.plan;
if(sisc->share_type == SHARE_MATERIAL || sisc->share_type == SHARE_MATERIAL_XSLICE)
{
if(node->ts_pos != NULL)
ntuplestore_destroy_accessor((NTupleStoreAccessor *) node->ts_pos);
if(node->ts_markpos != NULL)
pfree(node->ts_markpos);
if(NULL != node->ts_state && NULL != node->ts_state->matstore)
{
/* Check if shared X-SLICE. In that case, we can safely destroy our tuplestore */
if(ntuplestore_is_readerwriter_reader(node->ts_state->matstore))
{
ntuplestore_destroy(node->ts_state->matstore);
}
}
}
/*
* Reset our copy of the pointer to the the ts_state. The tuplestore can still be accessed by
* the other consumers, but we don't have a pointer to it anymore
*/
node->ts_state = NULL;
node->ts_pos = NULL;
node->ts_markpos = NULL;
/* This can be called more than once */
if (!node->freed &&
(sisc->share_type == SHARE_MATERIAL || sisc->share_type == SHARE_SORT))
{
/*
* Decrement reference count when it's intra-slice. We don't need
* two-pass tree descending because ShareInputScan should always appear
* before the underlying Material/Sort node.
*/
EState *estate = node->ss.ps.state;
ShareNodeEntry *snEntry = ExecGetShareNodeEntry(estate, sisc->share_id, false);
Assert(snEntry && snEntry->refcount > 0);
snEntry->refcount--;
}
node->freed = true;
}
/*
* DestroyTupleStore
* Helper function for destroying tuple store
*/
void
DestroyTupleStore(MaterialState *node)
{
Assert(NULL != node);
Assert(NULL != node->ts_state);
Assert(NULL != node->ts_state->matstore);
ntuplestore_destroy_accessor((NTupleStoreAccessor *) node->ts_pos);
ntuplestore_destroy(node->ts_state->matstore);
if(node->ts_markpos)
{
pfree(node->ts_markpos);
}
node->ts_state->matstore = NULL;
node->ts_pos = NULL;
node->ts_markpos = NULL;
node->eof_underlying = false;
node->ts_destroyed = true;
ExecMaterialResetWorkfileState(node);
}