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Posted to reviews@spark.apache.org by "allisonwang-db (via GitHub)" <gi...@apache.org> on 2023/11/14 00:51:27 UTC
[PR] [SPARK-45525][SQL][PYTHON] Initial support for Python data source write [spark]
allisonwang-db opened a new pull request, #43791:
URL: https://github.com/apache/spark/pull/43791
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### What changes were proposed in this pull request?
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This PR adds initial support for Python data source write. It adds a new command `SaveIntoPythonDataSourceCommand` and a logical rule similar to V1Writes/V2Writes to transform a Python data source write into a MapInPandas operation.
Note this PR only supports the `def write(self, iterator)` API. `commit` and `abort` will be supported in [SPARK-45914](https://issues.apache.org/jira/browse/SPARK-45914).
### Why are the changes needed?
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1. If you propose a new API, clarify the use case for a new API.
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To support Python data source APIs. For instance:
```python
class SimpleDataSource(DataSource):
def writer(self, schema, mode):
return SimpleWriter()
class SimpleWriter(DataSourceWriter):
def write(self, iterator: Iterator[Row]) -> Any:
for row in iterator:
print(row)
```
### Does this PR introduce _any_ user-facing change?
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No. This PR does not introduce any user-facing changes as it
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New unit tests
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No
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Re: [PR] [SPARK-45525][SQL][PYTHON] Support for Python data source write using DSv2 [spark]
Posted by "allisonwang-db (via GitHub)" <gi...@apache.org>.
allisonwang-db commented on PR #43791:
URL: https://github.com/apache/spark/pull/43791#issuecomment-1859852888
cc @HyukjinKwon @cloud-fan
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Re: [PR] [SPARK-45525][SQL][PYTHON] Initial support for Python data source write [spark]
Posted by "ueshin (via GitHub)" <gi...@apache.org>.
ueshin commented on code in PR #43791:
URL: https://github.com/apache/spark/pull/43791#discussion_r1401347054
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/PythonDataSourceWrites.scala:
##########
@@ -0,0 +1,132 @@
+/*
+ * 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.
+ */
+
+package org.apache.spark.sql.execution.datasources
+
+import java.io.{DataInputStream, DataOutputStream}
+
+import net.razorvine.pickle.Pickler
+
+import org.apache.spark.api.python.{PythonEvalType, PythonFunction, PythonWorkerUtils, SimplePythonFunction, SpecialLengths}
+import org.apache.spark.sql.SaveMode
+import org.apache.spark.sql.catalyst.expressions.{PredicateHelper, PythonUDF}
+import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, PythonMapInArrow}
+import org.apache.spark.sql.catalyst.rules.Rule
+import org.apache.spark.sql.catalyst.types.DataTypeUtils.toAttributes
+import org.apache.spark.sql.errors.QueryCompilationErrors
+import org.apache.spark.sql.execution.python.PythonPlannerRunner
+import org.apache.spark.sql.types.{BinaryType, StructField, StructType}
+
+
+/**
+ * A rule that constructs logical writes for Python data sources.
+ */
+object PythonDataSourceWrites extends Rule[LogicalPlan] with PredicateHelper {
+ override def apply(plan: LogicalPlan): LogicalPlan = plan transformDown {
+ case c @ SaveIntoPythonDataSourceCommand(
+ query, dataSourceCls, provider, options, mode, false) =>
+
+ // Start a Python process and create an instance of the Python data source writer.
+ // Return back a serialized Python function that's used to write data into the data source.
+ val runner = new SaveIntoPythonDataSourceRunner(
+ dataSourceCls, provider, options, mode, query)
+ val result = runner.runInPython()
+
+ // Construct the Python UDF.
+ val func = SimplePythonFunction(
+ command = result.func,
+ envVars = dataSourceCls.envVars,
+ pythonIncludes = dataSourceCls.pythonIncludes,
+ pythonExec = dataSourceCls.pythonExec,
+ pythonVer = dataSourceCls.pythonVer,
+ broadcastVars = dataSourceCls.broadcastVars,
+ accumulator = dataSourceCls.accumulator)
+
+ val dataType = StructType(Array(StructField("message", BinaryType)))
+
+ val pythonUDF = PythonUDF(
+ name = "save_into_data_source",
+ func = func,
+ dataType = dataType,
+ children = query.output,
+ evalType = PythonEvalType.SQL_MAP_ARROW_ITER_UDF,
+ udfDeterministic = true) // TODO(SPARK-45930): support non-deterministic udf
Review Comment:
nit: The issue `SPARK-45930` seems to be resolved?
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Re: [PR] [SPARK-45525][SQL][PYTHON] Support for Python data source write using DSv2 [spark]
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan commented on PR #43791:
URL: https://github.com/apache/spark/pull/43791#issuecomment-1867117935
thanks, merging to master!
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Re: [PR] [SPARK-45525][SQL][PYTHON] Initial support for Python data source write [spark]
Posted by "allisonwang-db (via GitHub)" <gi...@apache.org>.
allisonwang-db commented on PR #43791:
URL: https://github.com/apache/spark/pull/43791#issuecomment-1813486370
@cloud-fan @HyukjinKwon @ueshin This PR is ready for review. It focuses on the optimizer/execution part of data source write and is independent of the DataFrameWriter.
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Re: [PR] [SPARK-45525][SQL][PYTHON] Support for Python data source write using DSv2 [spark]
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan closed pull request #43791: [SPARK-45525][SQL][PYTHON] Support for Python data source write using DSv2
URL: https://github.com/apache/spark/pull/43791
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