HyukjinKwon commented on code in PR #46960: URL: https://github.com/apache/spark/pull/46960#discussion_r1664899268
########## python/pyspark/sql/connect/merge.py: ########## @@ -0,0 +1,257 @@ +# +# 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. +# + +import sys +from typing import Dict, Optional, TYPE_CHECKING, List, Callable + +from pyspark.sql.connect import proto +from pyspark.sql.connect.column import Column +from pyspark.sql.connect.functions import expr + +from pyspark.sql.merge import MergeIntoWriter as PySparkMergeIntoWriter + +if TYPE_CHECKING: + from pyspark.sql.connect.client import SparkConnectClient + from pyspark.sql.connect.plan import LogicalPlan + from pyspark.sql.connect.session import SparkSession + from pyspark.sql.metrics import ExecutionInfo + +__all__ = ["MergeIntoWriter"] + + +def _build_merge_action( + client: "SparkConnectClient", + action_type: proto.MergeAction.ActionType, + condition: Optional[Column] = None, + assignments: Optional[Dict[str, Column]] = None, +) -> proto.MergeAction: + proto_assignments = ( + None + if assignments is None + else [ + proto.MergeAction.Assignment(key=expr(k).to_plan(client), value=v.to_plan(client)) + for k, v in assignments.items() + ] + ) + return proto.MergeAction( + action_type=action_type, + condition=None if condition is None else condition.to_plan(client), + assignments=proto_assignments, + ) + + +class MergeIntoWriter: + def __init__( + self, + plan: "LogicalPlan", + session: "SparkSession", + table: str, + condition: Column, + callback: Optional[Callable[["ExecutionInfo"], None]] = None, + ): + self._client = session.client + self._target_table = table + self._source_plan = plan + self._condition = condition + + self._callback = callback if callback is not None else lambda _: None + self._schema_evolution_enabled = False + self._matched_actions = list() # type: List[proto.MergeAction] + self._not_matched_actions = list() # type: List[proto.MergeAction] + self._not_matched_by_source_actions = list() # type: List[proto.MergeAction] + + def whenMatched(self, condition: Optional[Column] = None) -> "MergeIntoWriter.WhenMatched": + return self.WhenMatched(self, condition) + + whenMatched.__doc__ = PySparkMergeIntoWriter.whenMatched.__doc__ + + def whenNotMatched( + self, condition: Optional[Column] = None + ) -> "MergeIntoWriter.WhenNotMatched": + return self.WhenNotMatched(self, condition) + + whenNotMatched.__doc__ = PySparkMergeIntoWriter.whenNotMatched.__doc__ + + def whenNotMatchedBySource( + self, condition: Optional[Column] = None + ) -> "MergeIntoWriter.WhenNotMatchedBySource": + return self.WhenNotMatchedBySource(self, condition) + + whenNotMatchedBySource.__doc__ = PySparkMergeIntoWriter.whenNotMatchedBySource.__doc__ + + def withSchemaEvolution(self) -> "MergeIntoWriter": + self._schema_evolution_enabled = True + return self + + withSchemaEvolution.__doc__ = PySparkMergeIntoWriter.withSchemaEvolution.__doc__ + + def merge(self) -> None: + def a2e(a): + return proto.Expression(merge_action=a) + + merge = proto.MergeIntoTableCommand( + target_table_name=self._target_table, + source_table_plan=self._source_plan.plan(self._client), + merge_condition=self._condition.to_plan(self._client), + match_actions=[a2e(a) for a in self._matched_actions], + not_matched_actions=[a2e(a) for a in self._not_matched_actions], + not_matched_by_source_actions=[a2e(a) for a in self._not_matched_by_source_actions], + with_schema_evolution=self._schema_evolution_enabled, + ) + _, _, ei = self._client.execute_command( + proto.Command(merge_into_table_command=merge), self._source_plan.observations + ) + self._callback(ei) + + merge.__doc__ = PySparkMergeIntoWriter.merge.__doc__ + + class WhenMatched: + def __init__(self, writer: "MergeIntoWriter", condition: Optional[Column]): + self.writer = writer + self._condition = condition + + def updateAll(self) -> "MergeIntoWriter": + action = _build_merge_action( + self.writer._client, proto.MergeAction.ACTION_TYPE_UPDATE_STAR, self._condition + ) + self.writer._matched_actions.append(action) + return self.writer + + updateAll.__doc__ = PySparkMergeIntoWriter.WhenMatched.updateAll.__doc__ + + def update(self, assignments: Dict[str, Column]) -> "MergeIntoWriter": + action = _build_merge_action( + self.writer._client, + proto.MergeAction.ACTION_TYPE_UPDATE, + self._condition, + assignments, + ) + self.writer._matched_actions.append(action) + return self.writer + + update.__doc__ = PySparkMergeIntoWriter.WhenMatched.update.__doc__ + + def delete(self) -> "MergeIntoWriter": + action = _build_merge_action( + self.writer._client, proto.MergeAction.ACTION_TYPE_DELETE, self._condition + ) + self.writer._matched_actions.append(action) + return self.writer + + delete.__doc__ = PySparkMergeIntoWriter.WhenMatched.delete.__doc__ + + WhenMatched.__doc__ = PySparkMergeIntoWriter.WhenMatched.__doc__ + + class WhenNotMatched: + def __init__(self, writer: "MergeIntoWriter", condition: Optional[Column]): + self.writer = writer + self._condition = condition + + def insertAll(self) -> "MergeIntoWriter": + action = _build_merge_action( + self.writer._client, proto.MergeAction.ACTION_TYPE_INSERT_STAR, self._condition + ) + self.writer._not_matched_actions.append(action) + return self.writer + + insertAll.__doc__ = PySparkMergeIntoWriter.WhenNotMatched.insertAll.__doc__ + + def insert(self, assignments: Dict[str, Column]) -> "MergeIntoWriter": + action = _build_merge_action( + self.writer._client, + proto.MergeAction.ACTION_TYPE_INSERT, + self._condition, + assignments, + ) + self.writer._not_matched_actions.append(action) + return self.writer + + insert.__doc__ = PySparkMergeIntoWriter.WhenNotMatched.insert.__doc__ + + WhenNotMatched.__doc__ = PySparkMergeIntoWriter.WhenNotMatched.__doc__ + + class WhenNotMatchedBySource: + def __init__(self, writer: "MergeIntoWriter", condition: Optional[Column]): + self.writer = writer + self._condition = condition + + def updateAll(self) -> "MergeIntoWriter": + action = _build_merge_action( + self.writer._client, proto.MergeAction.ACTION_TYPE_UPDATE_STAR, self._condition + ) + self.writer._not_matched_by_source_actions.append(action) + return self.writer + + updateAll.__doc__ = PySparkMergeIntoWriter.WhenNotMatchedBySource.updateAll.__doc__ + + def update(self, assignments: Dict[str, Column]) -> "MergeIntoWriter": + action = _build_merge_action( + self.writer._client, + proto.MergeAction.ACTION_TYPE_UPDATE, + self._condition, + assignments, + ) + self.writer._not_matched_by_source_actions.append(action) + return self.writer + + update.__doc__ = PySparkMergeIntoWriter.WhenNotMatchedBySource.update.__doc__ + + def delete(self) -> "MergeIntoWriter": + action = _build_merge_action( + self.writer._client, proto.MergeAction.ACTION_TYPE_DELETE, self._condition + ) + self.writer._not_matched_by_source_actions.append(action) + return self.writer + + delete.__doc__ = PySparkMergeIntoWriter.WhenNotMatchedBySource.delete.__doc__ + + WhenNotMatchedBySource.__doc__ = PySparkMergeIntoWriter.WhenNotMatchedBySource.__doc__ + + +MergeIntoWriter.__doc__ = PySparkMergeIntoWriter.__doc__ + + +def _test() -> None: + import doctest + import os + import py4j Review Comment: ```suggestion import py4j ``` -- This is an automated message from the Apache Git Service. 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