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[GitHub] [spark] viirya opened a new pull request #27853:
[SPARK-30941][PySpark] Add a note to asDict to document its behavior when
there are duplicate fields
viirya opened a new pull request #27853: [SPARK-30941][PySpark] Add a note to asDict to document its behavior when there are duplicate fields
URL: https://github.com/apache/spark/pull/27853
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### What changes were proposed in this pull request?
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Adding a note to document `Row.asDict` behavior when there are duplicate fields.
### Why are the changes needed?
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When a row contains duplicate fields, `asDict` and `_get_item_` behaves differently. We should document it to let users know the difference explicitly.
### Does this PR introduce any user-facing change?
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No. Only document change.
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Existing test.
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[GitHub] [spark] SparkQA commented on issue #27853: [SPARK-30941][PySpark]
Add a note to asDict to document its behavior when there are duplicate fields
Posted by GitBox <gi...@apache.org>.
SparkQA commented on issue #27853: [SPARK-30941][PySpark] Add a note to asDict to document its behavior when there are duplicate fields
URL: https://github.com/apache/spark/pull/27853#issuecomment-596607257
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[GitHub] [spark] dongjoon-hyun closed pull request #27853:
[SPARK-30941][PySpark] Add a note to asDict to document its behavior when
there are duplicate fields
Posted by GitBox <gi...@apache.org>.
dongjoon-hyun closed pull request #27853: [SPARK-30941][PySpark] Add a note to asDict to document its behavior when there are duplicate fields
URL: https://github.com/apache/spark/pull/27853
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[SPARK-30941][PySpark] Add a note to asDict to document its behavior when
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[GitHub] [spark] HyukjinKwon commented on a change in pull request #27853:
[SPARK-30941][PySpark] Add a note to asDict to document its behavior when
there are duplicate fields
Posted by GitBox <gi...@apache.org>.
HyukjinKwon commented on a change in pull request #27853: [SPARK-30941][PySpark] Add a note to asDict to document its behavior when there are duplicate fields
URL: https://github.com/apache/spark/pull/27853#discussion_r389506003
##########
File path: python/pyspark/sql/types.py
##########
@@ -1528,6 +1528,12 @@ def asDict(self, recursive=False):
:param recursive: turns the nested Rows to dict (default: False).
+ NOTE: If a row contains duplicate field names, e.g., the rows of a join
+ between two :class:`DataFrame` that both have the fields of same names,
+ ``asDict`` will return the rightmost value among the duplicate fields. In
+ contrast, ``__getitem__`` will return the leftmost value among the duplicate
Review comment:
@viirya, this is a nice description but what about saying like one of duplicate fields will be selected? I was wondering if we should fix such rightmost or leftmost order between `asDict` and `__getitem__` in the future, and if it's better to avoid saying the rightmost and leftmost.
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[GitHub] [spark] viirya commented on issue #27853: [SPARK-30941][PySpark]
Add a note to asDict to document its behavior when there are duplicate fields
Posted by GitBox <gi...@apache.org>.
viirya commented on issue #27853: [SPARK-30941][PySpark] Add a note to asDict to document its behavior when there are duplicate fields
URL: https://github.com/apache/spark/pull/27853#issuecomment-596603717
@HyukjinKwon Thanks for the comments. I revised the doc. Please take another look. Thanks.
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[GitHub] [spark] SparkQA commented on issue #27853: [SPARK-30941][PySpark]
Add a note to asDict to document its behavior when there are duplicate fields
Posted by GitBox <gi...@apache.org>.
SparkQA commented on issue #27853: [SPARK-30941][PySpark] Add a note to asDict to document its behavior when there are duplicate fields
URL: https://github.com/apache/spark/pull/27853#issuecomment-596626857
**[Test build #119571 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/119571/testReport)** for PR 27853 at commit [`6588ad5`](https://github.com/apache/spark/commit/6588ad5101739fb2734e99d751d12e801fda2cd6).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds no public classes.
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Add a note to asDict to document its behavior when there are duplicate fields
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* This patch passes all tests.
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[GitHub] [spark] viirya commented on issue #27853: [SPARK-30941][PySpark]
Add a note to asDict to document its behavior when there are duplicate fields
Posted by GitBox <gi...@apache.org>.
viirya commented on issue #27853: [SPARK-30941][PySpark] Add a note to asDict to document its behavior when there are duplicate fields
URL: https://github.com/apache/spark/pull/27853#issuecomment-596365211
cc @HyukjinKwon
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[GitHub] [spark] HyukjinKwon commented on a change in pull request #27853:
[SPARK-30941][PySpark] Add a note to asDict to document its behavior when
there are duplicate fields
Posted by GitBox <gi...@apache.org>.
HyukjinKwon commented on a change in pull request #27853: [SPARK-30941][PySpark] Add a note to asDict to document its behavior when there are duplicate fields
URL: https://github.com/apache/spark/pull/27853#discussion_r389504323
##########
File path: python/pyspark/sql/types.py
##########
@@ -1528,6 +1528,12 @@ def asDict(self, recursive=False):
:param recursive: turns the nested Rows to dict (default: False).
+ NOTE: If a row contains duplicate field names, e.g., the rows of a join
Review comment:
What about using:
```
.. note: If ...
...
```
?
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[GitHub] [spark] AmplabJenkins commented on issue #27853:
[SPARK-30941][PySpark] Add a note to asDict to document its behavior when
there are duplicate fields
Posted by GitBox <gi...@apache.org>.
AmplabJenkins commented on issue #27853: [SPARK-30941][PySpark] Add a note to asDict to document its behavior when there are duplicate fields
URL: https://github.com/apache/spark/pull/27853#issuecomment-596376100
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[GitHub] [spark] AmplabJenkins removed a comment on issue #27853:
[SPARK-30941][PySpark] Add a note to asDict to document its behavior when
there are duplicate fields
Posted by GitBox <gi...@apache.org>.
AmplabJenkins removed a comment on issue #27853: [SPARK-30941][PySpark] Add a note to asDict to document its behavior when there are duplicate fields
URL: https://github.com/apache/spark/pull/27853#issuecomment-596608030
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