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[SPARK-23290][SQL][PYTHON][BACKPORT-2.3] Use datetime.date for date t…
…ype when converting Spark DataFrame to Pandas DataFrame. ## What changes were proposed in this pull request? This is a backport of #20506. In #18664, there was a change in how `DateType` is being returned to users ([line 1968 in dataframe.py](https://github.com/apache/spark/pull/18664/files#diff-6fc344560230bf0ef711bb9b5573f1faR1968)). This can cause client code which works in Spark 2.2 to fail. See [SPARK-23290](https://issues.apache.org/jira/browse/SPARK-23290?focusedCommentId=16350917&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16350917) for an example. This pr modifies to use `datetime.date` for date type as Spark 2.2 does. ## How was this patch tested? Tests modified to fit the new behavior and existing tests. Author: Takuya UESHIN <email@example.com> Closes #20515 from ueshin/issues/SPARK-23290_2.3.
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