Riak TS Arithmetic Operations

Riak TS supports arithmetic operations in the SELECT statement.

Arithmetic operations default to 64-bit integer math unless mixed with a double, at which point they become floating-point.

Important

Proper spacing around arithmetic operators is required.

The examples on this page will assume you are using the following table schema:

CREATE TABLE GeoCheckin
(
   region       VARCHAR   NOT NULL,
   state        VARCHAR   NOT NULL,
   time         TIMESTAMP NOT NULL,
   weather      VARCHAR NOT NULL,
   temperature  DOUBLE,
   PRIMARY KEY (
     (region, state, QUANTUM(time, 15, 'm')),
     region, state, time
   )
)

Numeric Literals

Integer, decimal floating point, and exponent notation floating point numeric literals are accepted.

SELECT 555, 1.1, 1e1, 1.123e-2 from GeoCheckin
WHERE time > 1452252523182 AND time < 1452252543182 AND region = 'South Atlantic' AND state = 'South Carolina'

Returns:

555<SINT64>	1.1<DOUBLE>	10.0<DOUBLE>	0.01123<DOUBLE>
555	1.1	10.0	0.01123

Addition and Subtraction

SELECT temperature, temperature + 1, temperature - 1 FROM GeoCheckin
WHERE time > 1452252523182 AND time < 1452252543182 AND region = 'South Atlantic' AND state = 'South Carolina'

Returns:

temperature<DOUBLE>	(temperature+1)<DOUBLE>	(temperature-1)<DOUBLE>
27.1	28.1	26.1

Multiplication and Division

SELECT temperature, temperature * 2, temperature / 2 from GeoCheckin
WHERE time > 1452252523182 AND time < 1452252543182 AND region = 'South Atlantic' AND state = 'South Carolina'

Returns:

temperature<DOUBLE>	(temperature*2)<DOUBLE>	(temperature/2)<DOUBLE>
27.1	54.2	13.55

Negation

SELECT temperature, -temperature from GeoCheckin
WHERE time > 1452252523182 AND time < 1452252543182 AND region = 'South Atlantic' AND state = 'South Carolina'

Returns:

temperature<DOUBLE>	-temperature<DOUBLE>
27.1	-27.1

Order of Operations

SELECT temperature + 2 * 3, (temperature + 2) * 3 from GeoCheckin
WHERE time > 1452252523182 AND time < 1452252543182 AND region = 'South Atlantic' AND state = 'South Carolina'

Returns:

(temperature+(2*3))<DOUBLE>	((temperature+2)*3)<DOUBLE>
33.1	87.30000000000001

Floating Point Odds and Ends

Operations on floating point numbers that would return Infinity or NaN are not supported.

For example, neither of these queries return successfully:

SELECT 0.0 / 0.0 from GeoCheckin
WHERE time > 1452252523182 AND time < 1452252543182 AND region = 'South Atlantic' AND state = 'South Carolina'

SELECT 1.0 / 0.0 from GeoCheckin
WHERE time > 1452252523182 AND time < 1452252543182 AND region = 'South Atlantic' AND state = 'South Carolina'

Operations with Multiple Column References

Operations involving two or more references to columns are not supported.

This query will return an error:

SELECT temperature + temperature FROM GeoCheckin
WHERE time > 1452252523182 AND time < 1452252543182 AND region = 'South Atlantic' AND state = 'South Carolina'