Function DivideBsonValueNumbers

pg_documentdb_core/src/io/pgbson_utils.c:236–284

* Divides the number stored in dividend by divisor and modifies dividend. * returns true if division happened because of valid types */

 * returns true if division happened because of valid types
 */
bool
DivideBsonValueNumbers(bson_value_t *dividend, const bson_value_t *divisor)
{
	if (!BsonValueIsNumberOrBool(dividend) || !BsonValueIsNumberOrBool(divisor))
	{
		return false;
	}

	if (dividend->value_type == BSON_TYPE_DECIMAL128 ||
		divisor->value_type == BSON_TYPE_DECIMAL128)
	{
		bson_value_t dividend128 = *dividend;
		bson_value_t divisor128 = *divisor;
		if (divisor->value_type == BSON_TYPE_DECIMAL128)
		{
			dividend128.value_type = BSON_TYPE_DECIMAL128;
			dividend128.value.v_decimal128 = GetBsonValueAsDecimal128Quantized(dividend);
		}
		else
		{
			divisor128.value_type = BSON_TYPE_DECIMAL128;
			divisor128.value.v_decimal128 = GetBsonValueAsDecimal128Quantized(divisor);
		}

		if (IsDecimal128Zero(&divisor128))
		{
			ereport(ERROR, (errcode(ERRCODE_DOCUMENTDB_BADVALUE),
							errmsg("$divide by zero is not allowed")));
		}

		dividend->value_type = BSON_TYPE_DECIMAL128;
		DivideDecimal128Numbers(&dividend128, &divisor128, dividend);
	}
	else
	{
		double dividendDouble = BsonValueAsDouble(dividend);
		double divisorDouble = BsonValueAsDouble(divisor);

		if (divisorDouble == 0.0)
		{
			ereport(ERROR, (errcode(ERRCODE_DOCUMENTDB_BADVALUE),
							errmsg("$divide by zero is not allowed")));
		}

		dividend->value_type = BSON_TYPE_DOUBLE;
		dividend->value.v_double = dividendDouble / divisorDouble;
	}
	return true;
}


/*