Function ExecInsertIndexTuples

src/backend/executor/execIndexing.c:286–489

---------------------------------------------------------------- * ExecInsertIndexTuples * * This routine takes care of inserting index tuples * into all the relations indexing the result relation * when a heap tuple is inserted into the result relation. * * When 'update' is true, executor is performing an UPDATE * that could not use an optimization like heapam's HOT (in * more gen

 * ----------------------------------------------------------------
 */
List *
ExecInsertIndexTuples(ResultRelInfo *resultRelInfo,
					  TupleTableSlot *slot,
					  EState *estate,
					  bool update,
					  bool noDupErr,
					  bool *specConflict,
					  List *arbiterIndexes)
{
	ItemPointer tupleid = &slot->tts_tid;
	List	   *result = NIL;
	int			i;
	int			numIndices;
	RelationPtr relationDescs;
	Relation	heapRelation;
	IndexInfo **indexInfoArray;
	ExprContext *econtext;
	Datum		values[INDEX_MAX_KEYS];
	bool		isnull[INDEX_MAX_KEYS];

	Assert(ItemPointerIsValid(tupleid));

	/*
	 * Get information from the result relation info structure.
	 */
	numIndices = resultRelInfo->ri_NumIndices;
	relationDescs = resultRelInfo->ri_IndexRelationDescs;
	indexInfoArray = resultRelInfo->ri_IndexRelationInfo;
	heapRelation = resultRelInfo->ri_RelationDesc;

	/* Sanity check: slot must belong to the same rel as the resultRelInfo. */
	Assert(slot->tts_tableOid == RelationGetRelid(heapRelation));

	/*
	 * We will use the EState's per-tuple context for evaluating predicates
	 * and index expressions (creating it if it's not already there).
	 */
	econtext = GetPerTupleExprContext(estate);

	/* Arrange for econtext's scan tuple to be the tuple under test */
	econtext->ecxt_scantuple = slot;

	/*
	 * for each index, form and insert the index tuple
	 */
	for (i = 0; i < numIndices; i++)
	{
		Relation	indexRelation = relationDescs[i];
		IndexInfo  *indexInfo;
		bool		applyNoDupErr;
		IndexUniqueCheck checkUnique;
		bool		indexUnchanged;
		bool		satisfiesConstraint;

		if (indexRelation == NULL)
			continue;

		indexInfo = indexInfoArray[i];