python/pyspark/sql/udf.py - master - githubmirror/spark

python/pyspark/sql/udf.py
976 строк42 KB
Holden Karau
[SPARK-55206][PYTHON][SQL] Transpilation minimal functional implementation with python
03 авг 2026, 19:13
03 авг 2026, 19:131680141
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""
User-defined function related classes and functions
"""

import functools
import inspect
import sys
import warnings
from typing import Callable, Any, TYPE_CHECKING, Optional, cast, Union


from pyspark.util import PythonEvalType
from pyspark.sql.column import Column
from pyspark.sql.types import (
    DataType,
    StringType,
    StructType,
    _parse_datatype_string,
)
from pyspark.sql.utils import get_active_spark_context
from pyspark.sql.pandas.types import to_arrow_type
from pyspark.sql.pandas.utils import require_minimum_pandas_version, require_minimum_pyarrow_version
from pyspark.errors import PySparkTypeError, PySparkNotImplementedError, PySparkRuntimeError

if TYPE_CHECKING:
    from py4j.java_gateway import JavaObject
    from pyspark.core.context import SparkContext
    from pyspark.sql._typing import DataTypeOrString, ColumnOrName, UserDefinedFunctionLike
    from pyspark.sql.session import SparkSession

__all__ = ["UDFRegistration"]


def _wrap_function(
    sc: "SparkContext", func: Callable[..., Any], returnType: Optional[DataType] = None
) -> "JavaObject":
    from pyspark.core.rdd import _prepare_for_python_RDD

    command: Any
    if returnType is None:
        command = func
    else:
        command = (func, returnType)
    pickled_command, broadcast_vars, env, includes = _prepare_for_python_RDD(sc, command)
    assert sc._jvm is not None
    return sc._jvm.SimplePythonFunction(
        bytearray(pickled_command),
        env,
        includes,
        sc.pythonExec,
        sc.pythonVer,
        broadcast_vars,
        sc._javaAccumulator,
    )


def _create_udf(
    f: Callable[..., Any],
    returnType: "DataTypeOrString",
    evalType: int,
    name: Optional[str] = None,
    deterministic: bool = True,
) -> "UserDefinedFunctionLike":
    """Create a regular(non-Arrow-optimized) Python UDF."""
    # Set the name of the UserDefinedFunction object to be the name of function f
    udf_obj = UserDefinedFunction(
        f, returnType=returnType, name=name, evalType=evalType, deterministic=deterministic
    )
    return udf_obj._wrapped()


def _create_py_udf(
    f: Callable[..., Any],
    returnType: "DataTypeOrString",
    useArrow: Optional[bool] = None,
) -> "UserDefinedFunctionLike":
    """Create a regular/Arrow-optimized Python UDF."""
    # The tables in python/pyspark/sql/tests/udf_type_tests show the results when the type coercion
    # in Arrow is needed, that is, when the user-specified return type(SQL Type) of the UDF and the
    # actual instance(Python Value(Type)) that the UDF returns are different.
    # Arrow and Pickle have different type coercion rules, so a UDF might have a different result
    # with/without Arrow optimization. That's the main reason the Arrow optimization for Python
    # UDFs is disabled by default.

    is_arrow_enabled = False
    if useArrow is None:
        from pyspark.sql import SparkSession

        session = SparkSession._instantiatedSession
        is_arrow_enabled = (
            False
            if session is None
            else session.conf.get("spark.sql.execution.pythonUDF.arrow.enabled") == "true"
        )
    else:
        is_arrow_enabled = useArrow

    if is_arrow_enabled:
        try:
            require_minimum_pandas_version()
            require_minimum_pyarrow_version()
        except ImportError:
            is_arrow_enabled = False
            warnings.warn(
                "Arrow optimization failed to enable because PyArrow or Pandas is not installed. "
                "Falling back to a non-Arrow-optimized UDF.",
                RuntimeWarning,
            )

    eval_type: Optional[int] = None
    if useArrow is None:
        # If the user doesn't explicitly set useArrow
        from pyspark.sql.pandas.typehints import infer_eval_type_for_udf

        try:
            # Try to infer the eval type from type hints
            eval_type = infer_eval_type_for_udf(f)
        except Exception:
            warnings.warn("Cannot infer the eval type from type hints. ", UserWarning)

    if eval_type is None:
        if is_arrow_enabled:
            # Arrow optimized Python UDF
            eval_type = PythonEvalType.SQL_ARROW_BATCHED_UDF
        else:
            # Fallback to Regular Python UDF
            eval_type = PythonEvalType.SQL_BATCHED_UDF

    return _create_udf(f, returnType, eval_type)


class UserDefinedFunction:
    """
    User defined function in Python

    .. versionadded:: 1.3

    Notes
    -----
    The constructor of this class is not supposed to be directly called.
    Use :meth:`pyspark.sql.functions.udf` or :meth:`pyspark.sql.functions.pandas_udf`
    to create this instance.
    """

    def __init__(
        self,
        func: Callable[..., Any],
        returnType: "DataTypeOrString" = StringType(),
        name: Optional[str] = None,
        evalType: int = PythonEvalType.SQL_BATCHED_UDF,
        deterministic: bool = True,
    ):
        if not callable(func):
            raise PySparkTypeError(
                errorClass="NOT_EXPECTED_TYPE",
                messageParameters={
                    "expected_type": "callable",
                    "arg_name": "func",
                    "arg_type": type(func).__name__,
                },
            )

        if not isinstance(returnType, (DataType, str)):
            raise PySparkTypeError(
                errorClass="NOT_EXPECTED_TYPE",
                messageParameters={
                    "expected_type": "DataType or str",
                    "arg_name": "returnType",
                    "arg_type": type(returnType).__name__,
                },
            )

        if not isinstance(evalType, int):
            raise PySparkTypeError(
                errorClass="NOT_EXPECTED_TYPE",
                messageParameters={
                    "expected_type": "int",
                    "arg_name": "evalType",
                    "arg_type": type(evalType).__name__,
                },
            )

        self.func = func
        self._returnType = returnType
        # Stores UserDefinedPythonFunctions jobj, once initialized
        self._returnType_placeholder: Optional[DataType] = None
        self._judf_placeholder = None
        self._name = name or (
            func.__name__ if hasattr(func, "__name__") else func.__class__.__name__
        )
        self.evalType = evalType
        self.deterministic = deterministic
        # Extract Python UDF details if transpilation is enabled.
        self.transpiled: list = []
        self._transpiled_param_names: list[str] = []
        # Per-option input-type categories ("numeric"/"string" per public param),
        # parallel to ``self.transpiled``; the JVM picks the option matching the
        # actual column types or falls back to interpreted Python.
        self._transpiled_input_categories: list = []
        # When we have a transpiled rewrite, ``__call__`` resolves any
        # user-supplied kwargs against this positional parameter list so
        # the JVM-side ``_udf_param_N`` substitution sees the inputs in
        # the right order. Empty list when transpilation didn't happen.
        from pyspark.sql import SparkSession

        session = SparkSession._instantiatedSession

        # A nondeterministic UDF must not be transpiled: replacing it with a plain
        # Catalyst expression would let the optimizer fold/reorder/duplicate it,
        # discarding the nondeterminism barrier. (asNondeterministic() also clears
        # any options set here, for the udf(f).asNondeterministic() ordering.)
        # Conf values are compared case-insensitively: `SET conf=True` stores
        # the literal "True", which would otherwise silently disable
        # transpilation (or mis-trigger the ANSI warning below).
        #
        # Each conf read is a JVM roundtrip, so keep the default construction
        # path cheap: the experimental gate is only read for deterministic
        # batched UDFs (the only shape we transpile), and the ANSI conf is only
        # read once the gate is known to be on. When ``default`` is given it is
        # passed through to ``RuntimeConfig.get`` so construction never depends
        # on the JVM having the (experimental) conf registered -- e.g. a newer
        # Python client against an older driver. No default is passed for
        # ``spark.sql.ansi.enabled``: its registered default is dynamic
        # (environment-driven) and must be respected when the key is unset.
        def _conf_is_true(key: str, default: Optional[str] = None) -> bool:
            if session is None:
                return False
            if default is None:
                value = session.conf.get(key)
            else:
                value = session.conf.get(key, default)
            return value is not None and value.lower() == "true"

        try:
            transpile_enabled = (
                deterministic
                and evalType == PythonEvalType.SQL_BATCHED_UDF
                and _conf_is_true("spark.sql.experimental.optimizer.transpilePyUDFs", "false")
            )
            # Transpilation only attempts to reproduce ANSI-mode Spark SQL
            # semantics (no silent integer overflow, divide-by-zero raises,
            # etc.). Running it against non-ANSI Spark would balloon the test
            # matrix we'd have to maintain to verify Python-vs-SQL equivalence,
            # so we gate on ANSI here and warn the user instead of trying to
            # transpile in a mode we don't claim to support yet.
            if transpile_enabled and not _conf_is_true("spark.sql.ansi.enabled"):
                warnings.warn(
                    "Python UDF transpilation "
                    "(spark.sql.experimental.optimizer.transpilePyUDFs) is only "
                    "supported when ANSI mode is enabled "
                    "(spark.sql.ansi.enabled=true). Skipping transpilation for "
                    f"{func} -- enable ANSI mode or set transpilePyUDFs=false to "
                    "silence this warning.",
                    RuntimeWarning,
                )
                transpile_enabled = False
            if transpile_enabled and session:
                # Import only if needed, also avoid circular import loops.
                from pyspark.sql.transpile import _transpile_func

                # ``self.returnType`` parses (and caches) the declared return
                # type; the transpiler needs the parsed form to decide whether
                # the final Cast to it can resolve at all. The parse is reused
                # later by ``_create_judf``, so this adds no extra JVM work.
                (
                    self.transpiled,
                    errors,
                    self._transpiled_param_names,
                    self._transpiled_input_categories,
                ) = _transpile_func(session, func, self.returnType)
                if not self.transpiled:
                    detail = f": {errors}" if errors else ""
                    warnings.warn(f"Unable to transpile UDF {func}{detail}")
        except Exception as e:
            # An inability to transpile must never break a working UDF -- fall
            # back to interpreted Python execution and surface the failure as a
            # warning so users can opt to investigate without losing their
            # query. The conf reads above are included: a session whose JVM
            # cannot answer them should degrade to "no transpilation", not
            # break UDF definition.
            warnings.warn(f"Exception transpiling UDF {func}: {e}")
            self.transpiled = []
            self._transpiled_param_names = []
            self._transpiled_input_categories = []

    @staticmethod
    def _check_return_type(returnType: DataType, evalType: int) -> None:
        if evalType == PythonEvalType.SQL_ARROW_BATCHED_UDF:
            try:
                to_arrow_type(returnType, timezone="UTC")
            except TypeError:
                raise PySparkNotImplementedError(
                    errorClass="NOT_IMPLEMENTED",
                    messageParameters={
                        "feature": f"Invalid return type with Arrow-optimized Python UDF: "
                        f"{returnType}"
                    },
                )
        elif (
            evalType == PythonEvalType.SQL_SCALAR_PANDAS_UDF
            or evalType == PythonEvalType.SQL_SCALAR_PANDAS_ITER_UDF
        ):
            try:
                to_arrow_type(returnType, timezone="UTC")
            except TypeError:
                raise PySparkNotImplementedError(
                    errorClass="NOT_IMPLEMENTED",
                    messageParameters={
                        "feature": f"Invalid return type with scalar Pandas UDFs: {returnType}"
                    },
                )
        elif (
            evalType == PythonEvalType.SQL_SCALAR_ARROW_UDF
            or evalType == PythonEvalType.SQL_SCALAR_ARROW_ITER_UDF
        ):
            try:
                to_arrow_type(returnType, timezone="UTC")
            except TypeError:
                raise PySparkNotImplementedError(
                    errorClass="NOT_IMPLEMENTED",
                    messageParameters={
                        "feature": f"Invalid return type with scalar Arrow UDFs: {returnType}"
                    },
                )
        elif (
            evalType == PythonEvalType.SQL_GROUPED_MAP_PANDAS_UDF
            or evalType == PythonEvalType.SQL_GROUPED_MAP_PANDAS_ITER_UDF
            or evalType == PythonEvalType.SQL_GROUPED_MAP_PANDAS_UDF_WITH_STATE
        ):
            if isinstance(returnType, StructType):
                try:
                    to_arrow_type(returnType, timezone="UTC")
                except TypeError:
                    raise PySparkNotImplementedError(
                        errorClass="NOT_IMPLEMENTED",
                        messageParameters={
                            "feature": f"Invalid return type with grouped map Pandas UDFs or "
                            f"at groupby.applyInPandas(WithState): {returnType}"
                        },
                    )
            else:
                raise PySparkTypeError(
                    errorClass="INVALID_RETURN_TYPE_FOR_PANDAS_UDF",
                    messageParameters={
                        "eval_type": "SQL_GROUPED_MAP_PANDAS_UDF or "
                        "SQL_GROUPED_MAP_PANDAS_ITER_UDF or "
                        "SQL_GROUPED_MAP_PANDAS_UDF_WITH_STATE",
                        "return_type": str(returnType),
                    },
                )
        elif (
            evalType == PythonEvalType.SQL_MAP_PANDAS_ITER_UDF
            or evalType == PythonEvalType.SQL_MAP_ARROW_ITER_UDF
        ):
            if isinstance(returnType, StructType):
                try:
                    to_arrow_type(returnType, timezone="UTC")
                except TypeError:
                    raise PySparkNotImplementedError(
                        errorClass="NOT_IMPLEMENTED",
                        messageParameters={
                            "feature": f"Invalid return type in mapInPandas: {returnType}"
                        },
                    )
            else:
                raise PySparkTypeError(
                    errorClass="INVALID_RETURN_TYPE_FOR_PANDAS_UDF",
                    messageParameters={
                        "eval_type": "SQL_MAP_PANDAS_ITER_UDF or SQL_MAP_ARROW_ITER_UDF",
                        "return_type": str(returnType),
                    },
                )
        elif (
            evalType == PythonEvalType.SQL_GROUPED_MAP_ARROW_UDF
            or evalType == PythonEvalType.SQL_GROUPED_MAP_ARROW_ITER_UDF
        ):
            if isinstance(returnType, StructType):
                try:
                    to_arrow_type(returnType, timezone="UTC")
                except TypeError:
                    raise PySparkNotImplementedError(
                        errorClass="NOT_IMPLEMENTED",
                        messageParameters={
                            "feature": "Invalid return type with grouped map Arrow UDFs or "
                            f"at groupby.applyInArrow: {returnType}"
                        },
                    )
            else:
                raise PySparkTypeError(
                    errorClass="INVALID_RETURN_TYPE_FOR_ARROW_UDF",
                    messageParameters={
                        "eval_type": "SQL_GROUPED_MAP_ARROW_UDF or SQL_GROUPED_MAP_ARROW_ITER_UDF",
                        "return_type": str(returnType),
                    },
                )
        elif evalType == PythonEvalType.SQL_COGROUPED_MAP_PANDAS_UDF:
            if isinstance(returnType, StructType):
                try:
                    to_arrow_type(returnType, timezone="UTC")
                except TypeError:
                    raise PySparkNotImplementedError(
                        errorClass="NOT_IMPLEMENTED",
                        messageParameters={
                            "feature": f"Invalid return type in cogroup.applyInPandas: {returnType}"
                        },
                    )
            else:
                raise PySparkTypeError(
                    errorClass="INVALID_RETURN_TYPE_FOR_PANDAS_UDF",
                    messageParameters={
                        "eval_type": "SQL_COGROUPED_MAP_PANDAS_UDF",
                        "return_type": str(returnType),
                    },
                )
        elif evalType == PythonEvalType.SQL_COGROUPED_MAP_ARROW_UDF:
            if isinstance(returnType, StructType):
                try:
                    to_arrow_type(returnType, timezone="UTC")
                except TypeError:
                    raise PySparkNotImplementedError(
                        errorClass="NOT_IMPLEMENTED",
                        messageParameters={
                            "feature": f"Invalid return type in cogroup.applyInArrow: {returnType}"
                        },
                    )
            else:
                raise PySparkTypeError(
                    errorClass="INVALID_RETURN_TYPE_FOR_ARROW_UDF",
                    messageParameters={
                        "eval_type": "SQL_COGROUPED_MAP_ARROW_UDF",
                        "return_type": str(returnType),
                    },
                )
        elif evalType == PythonEvalType.SQL_GROUPED_AGG_PANDAS_UDF:
            try:
                # StructType is not yet allowed as a return type, explicitly check here to fail fast
                if isinstance(returnType, StructType):
                    raise PySparkNotImplementedError(
                        errorClass="NOT_IMPLEMENTED",
                        messageParameters={
                            "feature": f"Invalid return type with grouped aggregate Pandas UDFs: "
                            f"{returnType}"
                        },
                    )
                to_arrow_type(returnType, timezone="UTC")
            except TypeError:
                raise PySparkNotImplementedError(
                    errorClass="NOT_IMPLEMENTED",
                    messageParameters={
                        "feature": f"Invalid return type with grouped aggregate Pandas UDFs: "
                        f"{returnType}"
                    },
                )
        elif evalType == PythonEvalType.SQL_GROUPED_AGG_ARROW_UDF:
            try:
                # Different from SQL_GROUPED_AGG_PANDAS_UDF, StructType is allowed here
                to_arrow_type(returnType, timezone="UTC")
            except TypeError:
                raise PySparkNotImplementedError(
                    errorClass="NOT_IMPLEMENTED",
                    messageParameters={
                        "feature": f"Invalid return type with grouped aggregate Arrow UDFs: "
                        f"{returnType}"
                    },
                )

    @property
    def returnType(self) -> DataType:
        # Make sure this is called after SparkContext is initialized.
        # ``_parse_datatype_string`` accesses to JVM for parsing a DDL formatted string.
        if self._returnType_placeholder is None:
            if isinstance(self._returnType, DataType):
                self._returnType_placeholder = self._returnType
            else:
                self._returnType_placeholder = _parse_datatype_string(self._returnType)

        UserDefinedFunction._check_return_type(self._returnType_placeholder, self.evalType)
        return self._returnType_placeholder

    @property
    def _judf(self) -> "JavaObject":
        # It is possible that concurrent access, to newly created UDF,
        # will initialize multiple UserDefinedPythonFunctions.
        # This is unlikely, doesn't affect correctness,
        # and should have a minimal performance impact.
        if self._judf_placeholder is None:
            self._judf_placeholder = self._create_judf(self.func)
        return self._judf_placeholder

    def _create_judf(
        self, func: Callable[..., Any], include_transpiled: bool = True
    ) -> "JavaObject":
        from pyspark.sql import SparkSession
        from pyspark.sql.classic.column import _to_java_column_opt

        spark = SparkSession._getActiveSessionOrCreate()
        sc = spark.sparkContext

        wrapped_func = _wrap_function(sc, func, self.returnType)
        jdt = spark._jsparkSession.parseDataType(self.returnType.json())
        assert sc._jvm is not None
        transpiled = self.transpiled if include_transpiled else []
        input_categories = self._transpiled_input_categories if include_transpiled else []
        judf = getattr(sc._jvm, "org.apache.spark.sql.execution.python.UserDefinedPythonFunction")(
            self._name,
            wrapped_func,
            jdt,
            self.evalType,
            self.deterministic,
            map(_to_java_column_opt, transpiled),
            input_categories,
        )
        return judf

    def __call__(self, *args: "ColumnOrName", **kwargs: "ColumnOrName") -> Column:
        from pyspark.sql.classic.column import _to_java_column, _to_seq

        sc = get_active_spark_context()

        # Transpilation rewrites the UDF into a Catalyst expression that
        # references its inputs positionally via ``_udf_param_N`` (see
        # ``UserDefinedPythonFunction.builder.resolveUDFParams``). If the
        # caller used kwargs, the JVM-side substitution would otherwise
        # splice ``NamedArgumentExpression`` wrappers into the rewritten
        # tree (and into nested function calls like ``isnotnull``, which
        # rejects named arguments). Resolve kwargs to positional here
        # using the parameter list captured at transpilation time so the
        # rewritten expression sees plain column refs in declared order.
        if kwargs and self.transpiled and self._transpiled_param_names:
            params = self._transpiled_param_names
            ordered: list = list(args)
            remaining_kwargs = dict(kwargs)
            for pname in params[len(args) :]:
                if pname in remaining_kwargs:
                    ordered.append(remaining_kwargs.pop(pname))
                else:
                    # Caller didn't supply this param positionally or by
                    # name -- bail out of the rewrite and let the regular
                    # JVM-side path raise a user-facing error.
                    break
            else:
                if not remaining_kwargs:
                    args = tuple(ordered)
                    kwargs = {}

        assert sc._jvm is not None
        jcols = [_to_java_column(arg) for arg in args] + [
            sc._jvm.PythonSQLUtils.namedArgumentExpression(key, _to_java_column(value))
            for key, value in kwargs.items()
        ]

        profiler_enabled = sc._conf.get("spark.python.profile", "false") == "true"
        memory_profiler_enabled = sc._conf.get("spark.python.profile.memory", "false") == "true"

        if profiler_enabled or memory_profiler_enabled:
            # Disable profiling Pandas UDFs with iterators as input/output.
            if self.evalType in [
                PythonEvalType.SQL_SCALAR_PANDAS_ITER_UDF,
                PythonEvalType.SQL_SCALAR_ARROW_ITER_UDF,
                PythonEvalType.SQL_MAP_PANDAS_ITER_UDF,
                PythonEvalType.SQL_MAP_ARROW_ITER_UDF,
                PythonEvalType.SQL_GROUPED_AGG_ARROW_ITER_UDF,
                PythonEvalType.SQL_GROUPED_AGG_PANDAS_ITER_UDF,
            ]:
                warnings.warn(
                    "Profiling UDFs with iterators input/output is not supported.",
                    UserWarning,
                )
                judf = self._judf
                return Column(judf.apply(_to_seq(sc, jcols)))

            # Disallow enabling two profilers at the same time.
            if profiler_enabled and memory_profiler_enabled:
                # When both profilers are enabled, they interfere with each other,
                # that makes the result profile misleading.
                raise PySparkRuntimeError(
                    errorClass="CANNOT_SET_TOGETHER",
                    messageParameters={
                        "arg_list": "'spark.python.profile' and "
                        "'spark.python.profile.memory' configuration"
                    },
                )
            elif profiler_enabled:
                f = self.func
                profiler = sc.profiler_collector.new_udf_profiler(sc)

                @functools.wraps(f)
                def func(*args: Any, **kwargs: Any) -> Any:
                    assert profiler is not None
                    return profiler.profile(f, *args, **kwargs)

                func.__signature__ = inspect.signature(f)  # type: ignore[attr-defined]
                # Profiling requires the Python function to actually execute,
                # and the transpiled path never runs it (it also produces a
                # TranspiledPythonUDF, which has no resultId for the profiler
                # to key on). Build this call's judf without transpiled options.
                judf = self._create_judf(func, include_transpiled=False)
                jUDFExpr = judf.builderWithColumns(_to_seq(sc, jcols))
                jPythonUDF = judf.fromUDFExpr(jUDFExpr)
                id = jUDFExpr.resultId().id()
                sc.profiler_collector.add_profiler(id, profiler)
            else:  # memory_profiler_enabled
                f = self.func
                memory_profiler = sc.profiler_collector.new_memory_profiler(sc)
                sub_lines, start_line = inspect.getsourcelines(f.__code__)

                @functools.wraps(f)
                def func(*args: Any, **kwargs: Any) -> Any:
                    assert memory_profiler is not None
                    return memory_profiler.profile(
                        sub_lines,  # type: ignore[arg-type]
                        start_line,
                        f,
                        *args,
                        **kwargs,
                    )

                func.__signature__ = inspect.signature(f)  # type: ignore[attr-defined]
                # See the profiler branch above: no transpiled options while
                # profiling, since only the interpreted path runs the function.
                judf = self._create_judf(func, include_transpiled=False)
                jUDFExpr = judf.builderWithColumns(_to_seq(sc, jcols))
                jPythonUDF = judf.fromUDFExpr(jUDFExpr)
                id = jUDFExpr.resultId().id()
                sc.profiler_collector.add_profiler(id, memory_profiler)
        else:
            judf = self._judf
            jPythonUDF = judf.apply(_to_seq(sc, jcols))
        return Column(jPythonUDF)

    # This function is for improving the online help system in the interactive interpreter.
    # For example, the built-in help / pydoc.help. It wraps the UDF with the docstring and
    # argument annotation. (See: SPARK-19161)
    def _wrapped(self) -> "UserDefinedFunctionLike":
        """
        Wrap this udf with a function and attach docstring from func
        """

        # It is possible for a callable instance without __name__ attribute or/and
        # __module__ attribute to be wrapped here. For example, functools.partial. In this case,
        # we should avoid wrapping the attributes from the wrapped function to the wrapper
        # function. So, we take out these attribute names from the default names to set and
        # then manually assign it after being wrapped.
        assignments = tuple(
            a for a in functools.WRAPPER_ASSIGNMENTS if a != "__name__" and a != "__module__"
        )

        @functools.wraps(self.func, assigned=assignments)
        def wrapper(*args: "ColumnOrName", **kwargs: "ColumnOrName") -> Column:
            return self(*args, **kwargs)

        wrapper.__name__ = self._name
        wrapper.__module__ = (
            self.func.__module__
            if hasattr(self.func, "__module__")
            else self.func.__class__.__module__
        )

        wrapper.func = self.func  # type: ignore[attr-defined]
        wrapper.returnType = self.returnType  # type: ignore[attr-defined]
        wrapper.evalType = self.evalType  # type: ignore[attr-defined]
        wrapper.deterministic = self.deterministic  # type: ignore[attr-defined]
        wrapper.asNondeterministic = functools.wraps(  # type: ignore[attr-defined]
            self.asNondeterministic
        )(lambda: self.asNondeterministic()._wrapped())
        wrapper._unwrapped = self  # type: ignore[attr-defined]
        return wrapper  # type: ignore[return-value]

    def asNondeterministic(self) -> "UserDefinedFunction":
        """
        Updates UserDefinedFunction to nondeterministic.

        .. versionadded:: 2.3
        """
        # Here, we explicitly clean the cache to create a JVM UDF instance
        # with 'deterministic' updated. See SPARK-23233.
        self._judf_placeholder = None
        self.deterministic = False
        # A transpiled rewrite replaces the (now nondeterministic) Python UDF
        # with a plain Catalyst expression, which the optimizer is free to
        # fold, reorder, or duplicate -- discarding the nondeterminism barrier
        # the caller just asked for. Drop any transpiled options so a
        # nondeterministic UDF always runs as interpreted Python.
        self.transpiled = []
        self._transpiled_param_names = []
        self._transpiled_input_categories = []
        return self


class UDFRegistration:
    """
    Wrapper for user-defined function registration. This instance can be accessed by
    :attr:`spark.udf` or :attr:`sqlContext.udf`.

    .. versionadded:: 1.3.1
    """

    def __init__(self, sparkSession: "SparkSession"):
        self.sparkSession = sparkSession

    def register(
        self,
        name: str,
        f: Union[Callable[..., Any], "UserDefinedFunctionLike"],
        returnType: Optional["DataTypeOrString"] = None,
    ) -> "UserDefinedFunctionLike":
        """Register a Python function (including lambda function) or a user-defined function
        as a SQL function.

        .. versionadded:: 1.3.1

        .. versionchanged:: 3.4.0
            Supports Spark Connect.

        Parameters
        ----------
        name : str,
            name of the user-defined function in SQL statements.
        f : function, :meth:`pyspark.sql.functions.udf` or :meth:`pyspark.sql.functions.pandas_udf`
            a Python function, or a user-defined function. The user-defined function can
            be either row-at-a-time or vectorized. See :meth:`pyspark.sql.functions.udf` and
            :meth:`pyspark.sql.functions.pandas_udf`.
        returnType : :class:`pyspark.sql.types.DataType` or str, optional
            the return type of the registered user-defined function. The value can
            be either a :class:`pyspark.sql.types.DataType` object or a DDL-formatted type string.
            `returnType` can be optionally specified when `f` is a Python function but not
            when `f` is a user-defined function. Please see the examples below.

        Returns
        -------
        function
            a user-defined function

        Notes
        -----
        To register a nondeterministic Python function, users need to first build
        a nondeterministic user-defined function for the Python function and then register it
        as a SQL function.

        Examples
        --------
        1. When `f` is a Python function:

            `returnType` defaults to string type and can be optionally specified. The produced
            object must match the specified type. In this case, this API works as if
            `register(name, f, returnType=StringType())`.

            >>> strlen = spark.udf.register("stringLengthString", lambda x: len(x))
            >>> spark.sql("SELECT stringLengthString('test')").collect()
            [Row(stringLengthString(test)='4')]

            >>> spark.sql("SELECT 'foo' AS text").select(strlen("text")).collect()
            [Row(stringLengthString(text)='3')]

            >>> from pyspark.sql.types import IntegerType
            >>> _ = spark.udf.register("stringLengthInt", lambda x: len(x), IntegerType())
            >>> spark.sql("SELECT stringLengthInt('test')").collect()
            [Row(stringLengthInt(test)=4)]

            >>> from pyspark.sql.types import IntegerType
            >>> _ = spark.udf.register("stringLengthInt", lambda x: len(x), IntegerType())
            >>> spark.sql("SELECT stringLengthInt('test')").collect()
            [Row(stringLengthInt(test)=4)]

        2. When `f` is a user-defined function (from Spark 2.3.0):

            Spark uses the return type of the given user-defined function as the return type of
            the registered user-defined function. `returnType` should not be specified.
            In this case, this API works as if `register(name, f)`.

            >>> from pyspark.sql.types import IntegerType
            >>> from pyspark.sql.functions import udf
            >>> slen = udf(lambda s: len(s), IntegerType())
            >>> _ = spark.udf.register("slen", slen)
            >>> spark.sql("SELECT slen('test')").collect()
            [Row(slen(test)=4)]

            >>> import random
            >>> from pyspark.sql.functions import udf
            >>> from pyspark.sql.types import IntegerType
            >>> random_udf = udf(lambda: random.randint(0, 100), IntegerType()).asNondeterministic()
            >>> new_random_udf = spark.udf.register("random_udf", random_udf)
            >>> spark.sql("SELECT random_udf()").collect()  # doctest: +SKIP
            [Row(random_udf()=82)]

            >>> import pandas as pd
            >>> from pyspark.sql.functions import pandas_udf
            >>> @pandas_udf("integer")
            ... def add_one(s: pd.Series) -> pd.Series:
            ...     return s + 1
            ...
            >>> _ = spark.udf.register("add_one", add_one)
            >>> spark.sql("SELECT add_one(id) FROM range(3)").collect()
            [Row(add_one(id)=1), Row(add_one(id)=2), Row(add_one(id)=3)]

            >>> @pandas_udf("integer")
            ... def sum_udf(v: pd.Series) -> int:
            ...     return v.sum()
            ...
            >>> _ = spark.udf.register("sum_udf", sum_udf)
            >>> q = "SELECT sum_udf(v1) FROM VALUES (3, 0), (2, 0), (1, 1) tbl(v1, v2) GROUP BY v2"
            >>> spark.sql(q).sort("sum_udf(v1)").collect()
            [Row(sum_udf(v1)=1), Row(sum_udf(v1)=5)]
        """

        # This is to check whether the input function is from a user-defined function or
        # Python function.
        if hasattr(f, "asNondeterministic"):
            if returnType is not None:
                raise PySparkTypeError(
                    errorClass="CANNOT_SPECIFY_RETURN_TYPE_FOR_UDF",
                    messageParameters={"arg_name": "f", "return_type": str(returnType)},
                )
            f = cast("UserDefinedFunctionLike", f)
            if f.evalType not in [
                PythonEvalType.SQL_BATCHED_UDF,
                PythonEvalType.SQL_ARROW_BATCHED_UDF,
                PythonEvalType.SQL_SCALAR_PANDAS_UDF,
                PythonEvalType.SQL_SCALAR_ARROW_UDF,
                PythonEvalType.SQL_SCALAR_PANDAS_ITER_UDF,
                PythonEvalType.SQL_SCALAR_ARROW_ITER_UDF,
                PythonEvalType.SQL_GROUPED_AGG_PANDAS_UDF,
                PythonEvalType.SQL_GROUPED_AGG_ARROW_UDF,
                PythonEvalType.SQL_GROUPED_AGG_PANDAS_ITER_UDF,
                PythonEvalType.SQL_GROUPED_AGG_ARROW_ITER_UDF,
            ]:
                raise PySparkTypeError(
                    errorClass="INVALID_UDF_EVAL_TYPE",
                    messageParameters={
                        "eval_type": "SQL_BATCHED_UDF, SQL_ARROW_BATCHED_UDF, "
                        "SQL_SCALAR_PANDAS_UDF, SQL_SCALAR_ARROW_UDF, "
                        "SQL_SCALAR_PANDAS_ITER_UDF, SQL_SCALAR_ARROW_ITER_UDF, "
                        "SQL_GROUPED_AGG_PANDAS_UDF, SQL_GROUPED_AGG_ARROW_UDF, "
                        "SQL_GROUPED_AGG_PANDAS_ITER_UDF or SQL_GROUPED_AGG_ARROW_ITER_UDF"
                    },
                )
            source_udf = _create_udf(
                f.func,
                returnType=f.returnType,
                name=name,
                evalType=f.evalType,
                deterministic=f.deterministic,
            )
            register_udf = source_udf._unwrapped  # type: ignore[attr-defined]
            return_udf = register_udf
        else:
            if returnType is None:
                returnType = StringType()
            return_udf = _create_udf(
                f, returnType=returnType, evalType=PythonEvalType.SQL_BATCHED_UDF, name=name
            )
            register_udf = return_udf._unwrapped  # type: ignore[attr-defined]
        self.sparkSession._jsparkSession.udf().registerPython(name, register_udf._judf)
        return return_udf

    def registerJavaFunction(
        self,
        name: str,
        javaClassName: str,
        returnType: Optional["DataTypeOrString"] = None,
    ) -> None:
        """Register a Java user-defined function as a SQL function.

        In addition to a name and the function itself, the return type can be optionally specified.
        When the return type is not specified we would infer it via reflection.

        .. versionadded:: 2.3.0

        .. versionchanged:: 3.4.0
            Supports Spark Connect.

        Parameters
        ----------
        name : str
            name of the user-defined function
        javaClassName : str
            fully qualified name of java class
        returnType : :class:`pyspark.sql.types.DataType` or str, optional
            the return type of the registered Java function. The value can be either
            a :class:`pyspark.sql.types.DataType` object or a DDL-formatted type string.

        Examples
        --------
        >>> from pyspark.sql.types import IntegerType
        >>> spark.udf.registerJavaFunction(
        ...     "javaStringLength", "test.org.apache.spark.sql.JavaStringLength", IntegerType())
        ... # doctest: +SKIP
        >>> spark.sql("SELECT javaStringLength('test')").collect()  # doctest: +SKIP
        [Row(javaStringLength(test)=4)]

        >>> spark.udf.registerJavaFunction(
        ...     "javaStringLength2", "test.org.apache.spark.sql.JavaStringLength")
        ... # doctest: +SKIP
        >>> spark.sql("SELECT javaStringLength2('test')").collect()  # doctest: +SKIP
        [Row(javaStringLength2(test)=4)]

        >>> spark.udf.registerJavaFunction(
        ...     "javaStringLength3", "test.org.apache.spark.sql.JavaStringLength", "integer")
        ... # doctest: +SKIP
        >>> spark.sql("SELECT javaStringLength3('test')").collect()  # doctest: +SKIP
        [Row(javaStringLength3(test)=4)]
        """

        jdt = None
        if returnType is not None:
            if not isinstance(returnType, DataType):
                returnType = _parse_datatype_string(returnType)
            jdt = self.sparkSession._jsparkSession.parseDataType(returnType.json())
        self.sparkSession._jsparkSession.udf().registerJava(name, javaClassName, jdt)

    def registerJavaUDAF(self, name: str, javaClassName: str) -> None:
        """Register a Java user-defined aggregate function as a SQL function.

        .. versionadded:: 2.3.0

        .. versionchanged:: 3.4.0
            Supports Spark Connect.

        name : str
            name of the user-defined aggregate function
        javaClassName : str
            fully qualified name of java class

        Examples
        --------
        >>> spark.udf.registerJavaUDAF("javaUDAF", "test.org.apache.spark.sql.MyDoubleAvg")
        ... # doctest: +SKIP
        >>> df = spark.createDataFrame([(1, "a"),(2, "b"), (3, "a")],["id", "name"])
        >>> df.createOrReplaceTempView("df")
        >>> q = "SELECT name, javaUDAF(id) as avg from df group by name order by name desc"
        >>> spark.sql(q).collect()  # doctest: +SKIP
        [Row(name='b', avg=102.0), Row(name='a', avg=102.0)]
        """

        self.sparkSession._jsparkSession.udf().registerJavaUDAF(name, javaClassName)


def _test() -> None:
    import doctest
    from pyspark.sql import SparkSession
    import pyspark.sql.udf
    from pyspark.testing.utils import have_pandas, have_pyarrow

    globs = pyspark.sql.udf.__dict__.copy()

    if not have_pandas or not have_pyarrow:
        del pyspark.sql.udf.UDFRegistration.register.__doc__

    spark = SparkSession.builder.master("local[4]").appName("sql.udf tests").getOrCreate()
    globs["spark"] = spark
    failure_count, test_count = doctest.testmod(
        pyspark.sql.udf, globs=globs, optionflags=doctest.ELLIPSIS | doctest.NORMALIZE_WHITESPACE
    )
    spark.stop()
    if failure_count:
        sys.exit(-1)


if __name__ == "__main__":
    _test()