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daft.functions.list_mean#

list_mean #

list_mean(list_expr: Expression) -> Expression

Calculates the mean of each list. If no non-null values in a list, the result is null.

Parameters:

Name Type Description Default
list_expr List Expression

expression to calculate the mean of.

 required

Returns:

Name Type Description
Expression Float64 Expression

an expression with the calculated mean of the list values
Source code in daft/functions/list.py 
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def list_mean(list_expr: Expression) -> Expression:
    """Calculates the mean of each list. If no non-null values in a list, the result is null.

    Args:
        list_expr (List Expression): expression to calculate the mean of.

    Returns:
        Expression (Float64 Expression): an expression with the calculated mean of the list values
    """
    return Expression._call_builtin_scalar_fn("list_mean", list_expr)