daft.expressions.Expression

class daft.expressions.Expression

__init__() → None

Methods

__init__()
alias(name)	Gives the expression a new name, which is its column's name in the DataFrame schema and the name by which subsequent expressions can refer to the results of this expression.
apply(func[, return_dtype, return_type])	Apply a function on a given expression
apply_and_trickle_down(rule)
as_py(type_)	Treats every value on the given expression as an object of the specified type.
cast(to)	Casts an expression to a given type
has_call()
if_else(if_true, if_false)	Conditionally choose values between two expressions using the current LOGICAL expression as a condition
is_nan()	Checks if values are NaN (a special float value indicating not-a-number)
is_null()	Checks if values in the Expression are Null (a special value indicating missing data)
name()
post_order()
to_column_expression()
to_dot()
to_dot_file([filename])
to_field(schema)

Attributes

dt	Access methods that work on columns of datetimes
str	Access methods that work on columns of strings
url	Access methods that work on columns of URLs