flytekitplugins.spark.schema

Directory

Classes

flytekitplugins.spark.schema.SparkDataFrameSchemaReader

Implements how SparkDataFrame should be read using the open method of FlyteSchema

class SparkDataFrameSchemaReader(
    from_path: str,
    cols: typing.Optional[typing.Dict[str, type]],
    fmt: <enum 'SchemaFormat'>,
)

Methods

all()

def all(
    kwargs,
) -> pyspark.sql.dataframe.DataFrame

iter()

def iter(
    kwargs,
) -> typing.Generator[~T, NoneType, NoneType]

Properties

flytekitplugins.spark.schema.SparkDataFrameSchemaWriter

Implements how SparkDataFrame should be written to using open method of FlyteSchema

class SparkDataFrameSchemaWriter(
    to_path: str,
    cols: typing.Optional[typing.Dict[str, type]],
    fmt: <enum 'SchemaFormat'>,
)

Methods

write()

def write(
    dfs: pyspark.sql.dataframe.DataFrame,
    kwargs,
)

Properties

flytekitplugins.spark.schema.SparkDataFrameTransformer

Transforms Spark DataFrame’s to and from a Schema (typed/untyped)

def SparkDataFrameTransformer()

Methods

assert_type()

def assert_type(
    t: Type[T],
    v: T,
)

from_binary_idl()

def from_binary_idl(
    binary_idl_object: Binary,
    expected_python_type: Type[T],
) -> Optional[T]

This function primarily handles deserialization for untyped dicts, dataclasses, Pydantic BaseModels, and attribute access.｀

For untyped dict, dataclass, and pydantic basemodel: Life Cycle (Untyped Dict as example): python val -> msgpack bytes -> binary literal scalar -> msgpack bytes -> python val (to_literal) (from_binary_idl)

For attribute access: Life Cycle: python val -> msgpack bytes -> binary literal scalar -> resolved golang value -> binary literal scalar -> msgpack bytes -> python val (to_literal) (propeller attribute access) (from_binary_idl)

from_generic_idl()

def from_generic_idl(
    generic: Struct,
    expected_python_type: Type[T],
) -> Optional[T]

TODO: Support all Flyte Types. This is for dataclass attribute access from input created from the Flyte Console.

Note:

• This can be removed in the future when the Flyte Console support generate Binary IDL Scalar as input.

get_literal_type()

def get_literal_type(
    t: typing.Type[pyspark.sql.dataframe.DataFrame],
) -> flytekit.models.types.LiteralType

Converts the python type to a Flyte LiteralType

guess_python_type()

def guess_python_type(
    literal_type: LiteralType,
) -> Type[T]

Converts the Flyte LiteralType to a python object type.

isinstance_generic()

def isinstance_generic(
    obj,
    generic_alias,
)

to_html()

def to_html(
    ctx: FlyteContext,
    python_val: T,
    expected_python_type: Type[T],
) -> str

Converts any python val (dataframe, int, float) to a html string, and it will be wrapped in the HTML div

to_literal()

def to_literal(
    ctx: flytekit.core.context_manager.FlyteContext,
    python_val: pyspark.sql.dataframe.DataFrame,
    python_type: typing.Type[pyspark.sql.dataframe.DataFrame],
    expected: flytekit.models.types.LiteralType,
) -> flytekit.models.literals.Literal

Converts a given python_val to a Flyte Literal, assuming the given python_val matches the declared python_type. Implementers should refrain from using type(python_val) instead rely on the passed in python_type. If these do not match (or are not allowed) the Transformer implementer should raise an AssertionError, clearly stating what was the mismatch

to_python_value()

def to_python_value(
    ctx: flytekit.core.context_manager.FlyteContext,
    lv: flytekit.models.literals.Literal,
    expected_python_type: typing.Type[pyspark.sql.dataframe.DataFrame],
) -> ~T

Converts the given Literal to a Python Type. If the conversion cannot be done an AssertionError should be raised

Properties