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### What changes were proposed in this pull request? This proposes to port old PySpark migration guide to new PySpark docs. ### Why are the changes needed? Better documentation. ### Does this PR introduce _any_ user-facing change? No. Documentation only. ### How was this patch tested? Generated document locally. <img width="1521" alt="Screen Shot 2020-08-07 at 1 53 20 PM" src="https://user-images.githubusercontent.com/68855/89687618-672e7700-d8b5-11ea-8f29-67a9ab271fa8.png"> Closes #29385 from viirya/SPARK-32191. Authored-by: Liang-Chi Hsieh <viirya@gmail.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org>
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.. Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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.. http://www.apache.org/licenses/LICENSE-2.0
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.. Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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=================================
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Upgrading from PySpark 2.3 to 2.4
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=================================
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* In PySpark, when Arrow optimization is enabled, previously ``toPandas`` just failed when Arrow optimization is unable to be used whereas ``createDataFrame`` from Pandas DataFrame allowed the fallback to non-optimization. Now, both ``toPandas`` and ``createDataFrame`` from Pandas DataFrame allow the fallback by default, which can be switched off by ``spark.sql.execution.arrow.fallback.enabled``.
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