transform_values function

Transforms values in a map in expr using the function func.

Syntax

transform_values(expr, func)

Arguments

  • expr: A MAP expression.
  • func: A lambda function.

Returns

A MAP where the values have the type of the result of the lambda functions and the keys have the type of the expr MAP keys.

The lambda function must have 2 parameters. The first parameter represents the key. The second parameter represents the value.

The lambda function produces a new value for each entry in the map.

Examples

> SELECT transform_values(map_from_arrays(array(1, 2, 3), array(1, 2, 3)), (k, v) -> v + 1);
 {1 -> 2, 2 -> 3, 3 -> 4}
> SELECT transform_values(map_from_arrays(array(1, 2, 3), array(1, 2, 3)), (k, v) -> k + v);
 {1 -> 2, 2 -> 4, 3 -> 6}