gravitino.api.expressions.transforms.transform.SingleFieldTransform

class gravitino.api.expressions.transforms.transform.SingleFieldTransform(ref: NamedReference)

Bases: Transform

Base class for transforms on a single field.

__init__(ref: NamedReference)

Methods

__init__(ref)
arguments()	Gets the arguments passed to the transform function.
assignments()	Gets the preassigned partitions in the partitioning.
children()	Returns a list of the children of this node.
field_name()	Gets the referenced field name as a list of string parts.
name()	Gets the transform function name.
references()	Returns a list of fields or columns that are referenced by this expression.

Attributes

EMPTY_EXPRESSION	EMPTY_EXPRESSION is only used as an input when the default children method builds the result.
EMPTY_NAMED_REFERENCE	EMPTY_NAMED_REFERENCE is only used as an input when the default references method builds the result array to avoid repeatedly allocating an empty array.

EMPTY_EXPRESSION: List[Expression] = []

EMPTY_EXPRESSION is only used as an input when the default children method builds the result.

EMPTY_NAMED_REFERENCE: List[NamedReference] = []

EMPTY_NAMED_REFERENCE is only used as an input when the default references method builds the result array to avoid repeatedly allocating an empty array.

arguments() → List[Expression]

Gets the arguments passed to the transform function.

Returns:

List[Expression]: The arguments passed to the transform function.

assignments() → List[Partition]

Gets the preassigned partitions in the partitioning.

Currently, only Transforms.ListTransform and Transforms.RangeTransform need to deal with assignments

Returns:

List[Partition]: The preassigned partitions in the partitioning.

children() → List[Expression]

Returns a list of the children of this node. Children should not change.

field_name() → List[str]

Gets the referenced field name as a list of string parts.

Returns:

List[str]: The referenced field name as an array of String parts.

abstract name() → str

Gets the transform function name.

Returns:

str: The transform function name.

references() → List[NamedReference]

Returns a list of fields or columns that are referenced by this expression.