daft.Expression.if_else

Expression.if_else(if_true: Expression, if_false: Expression) → Expression

Conditionally choose values between two expressions using the current boolean expression as a condition

Example

>>> # x = [2, 2, 2]
>>> # y = [1, 2, 3]
>>> # a = ["a", "a", "a"]
>>> # b = ["b", "b", "b"]
>>> # if_else_result = ["a", "b", "b"]
>>> (col("x") > col("y")).if_else(col("a"), col("b"))

Parameters:

• if_true (Expression) – Values to choose if condition is true

• if_false (Expression) – Values to choose if condition is false

Returns:

New expression where values are chosen from if_true and if_false.

Return type:

Expression

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