Function bson_dollar_all

pg_documentdb/src/query/bson_dollar_operators.c:705–749

* Traverses the document for a given dot-path notation * When a matching path is found, then returns true if the * element meets the $all operator criteria. Returns false * otherwise. */

 * otherwise.
 */
Datum
bson_dollar_all(PG_FUNCTION_ARGS)
{
	pgbson *document = PG_GETARG_PGBSON(0);
	TraverseAllValidateState validationState = {
		.elementState =
		{
			.filter = NULL,
			.traverseState = { 0 }
		},
		.matchState = NULL,
		.arrayHasOnlyNulls = false,
		.evalStateArray = NULL,
		.crePcreData = NULL
	};

	pgbsonelement filterElement = { 0 };
	PopulateDollarAllValidationState(fcinfo, &validationState, &filterElement);

	/* an empty array for $all doesn't match any elements */
	if (validationState.matchState == NULL)
	{
		PG_RETURN_BOOL(false);
	}

	const TraverseBsonExecutionFuncs *execFuncs = &CompareExecutionFuncs;
	if (validationState.evalStateArray != NULL)
	{
		execFuncs = &CompareTopLevelFieldExecutionFuncs;
	}

	bson_iter_t documentIterator;
	PgbsonInitIterator(document, &documentIterator);
	TraverseBson(&documentIterator, filterElement.path,
				 &validationState.elementState.traverseState,
				 execFuncs);
	pfree(validationState.matchState);

	/* if path was not found and the $all array only contains null,
	 * ([null], or [null,null,null]) we have a match. */
	IsQueryFilterNullFunc isNullFilterEquality = IsQueryFilterNullForDollarAll;
	PG_RETURN_BOOL(ProcessQueryResultAndGetMatch(isNullFilterEquality,
												 &validationState.elementState.
												 traverseState));
}


/*