Function bson_dollar_nin

pg_documentdb/src/query/bson_dollar_operators.c:1601–1625

* bson_dollar_nin implements the $nin functionality * in the runtime. This traverses the document based on * filter dot-notation syntax and for all possible values, checks * that at least one does not match the query value presented. * Note: per $nin requirements, documents that don't have the field * are also considered to be $nin. */

 * are also considered to be $nin.
 */
Datum
bson_dollar_nin(PG_FUNCTION_ARGS)
{
	pgbson *document = PG_GETARG_PGBSON(0);
	bson_iter_t documentIterator;
	TraverseInValidateState state = { 0 };

	pgbsonelement filterElement = { 0 };
	PopulateDollarInValidationState(fcinfo, &state, &filterElement, false);

	PgbsonInitIterator(document, &documentIterator);

	TraverseBson(&documentIterator, filterElement.path, &state.traverseState,
				 &CompareExecutionFuncs);

	if (state.hasNull)
	{
		/* If any element in the input is null and the target path cannot be found in the document, we'll not choose that document. */
		PG_RETURN_BOOL(state.traverseState.compareResult == CompareResult_Mismatch);
	}
	else
	{
		PG_RETURN_BOOL(state.traverseState.compareResult != CompareResult_Match);
	}
}


/*