Function AddValue

src/backend/optimizer/util/predtest_valueset.c:180–207

* basic operation on PossibleValueSet: add a value to the set field of PossibleValueSet * * The caller must verify that the valueToCopy is greenplum hashable */

 * The caller must verify that the valueToCopy is greenplum hashable
 */
static void
AddValue(PossibleValueSet *pvs, Const *valueToCopy)
{
	if (pvs->set == NULL)
	{
		Assert(pvs->memoryContext == NULL);

		pvs->memoryContext = AllocSetContextCreate(CurrentMemoryContext,
												   "PossibleValueSet",
												   ALLOCSET_DEFAULT_MINSIZE,
												   ALLOCSET_DEFAULT_INITSIZE,
												   ALLOCSET_DEFAULT_MAXSIZE);
		pvs->set = CreateNodeSetHashTable(pvs->memoryContext);
	}

	if (!ContainsValue(pvs, valueToCopy))
	{
		bool		found; /* unused but needed in call */
		MemoryContext oldContext = MemoryContextSwitchTo(pvs->memoryContext);

		Const	   *key = copyObject(valueToCopy);
		ConstHashValue *entry = hash_search(pvs->set, &key, HASH_ENTER, &found);

		entry->c = key;

		MemoryContextSwitchTo(oldContext);
	}
}

static void
SetToNoValuesPossible(PossibleValueSet *pvs)