Function ValidateWeightsSpec

pg_documentdb/src/opclass/bson_text_gin.c:1209–1246

* Validates the incoming weight spec into create_indexes */

 * Validates the incoming weight spec into create_indexes
 */
static void
ValidateWeightsSpec(const char *weightsSpec)
{
	if (weightsSpec == NULL || strlen(weightsSpec) == 0)
	{
		/* Wildcard */
		return;
	}

	pgbson *bson = PgbsonInitFromJson(weightsSpec);

	int numCustomWeights = 0;
	bson_iter_t weightsIter;
	PgbsonInitIterator(bson, &weightsIter);

	while (bson_iter_next(&weightsIter))
	{
		if (bson_iter_key_len(&weightsIter) == 0)
		{
			ereport(ERROR, (errcode(ERRCODE_DOCUMENTDB_INVALIDINDEXSPECIFICATIONOPTION),
							errmsg("Weights must have a valid path")));
		}

		double value = BsonValueAsDouble(bson_iter_value(&weightsIter));
		if (value != 1.0)
		{
			numCustomWeights++;
		}
	}

	/* Postgres supports only 4 weights A, B, C, D */
	/* Since we reserve "D" as weight 1, we can only have 3 custom weights */
	if (numCustomWeights > 3)
	{
		ereport(ERROR, (errcode(ERRCODE_DOCUMENTDB_COMMANDNOTSUPPORTED),
						errmsg("Cannot have more than 3 custom weights in the index")));
	}
}


/*