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new f378c7f [SPARK-30941][PYSPARK] Add a note to asDict to document its
behavior when there are duplicate fields
f378c7f is described below
commit f378c7fba29368ca32142a3b7fc169dabe6cb37f
Author: Liang-Chi Hsieh <vii...@gmail.com>
AuthorDate: Mon Mar 9 11:06:45 2020 -0700
[SPARK-30941][PYSPARK] Add a note to asDict to document its behavior when
there are duplicate fields
### What changes were proposed in this pull request?
Adding a note to document `Row.asDict` behavior when there are duplicate
fields.
### Why are the changes needed?
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?
No. Only document change.
### How was this patch tested?
Existing test.
Closes #27853 from viirya/SPARK-30941.
Authored-by: Liang-Chi Hsieh <vii...@gmail.com>
Signed-off-by: Dongjoon Hyun <dongj...@apache.org>
(cherry picked from commit d21aab403a0a32e8b705b38874c0b335e703bd5d)
Signed-off-by: Dongjoon Hyun <dongj...@apache.org>
---
python/pyspark/sql/types.py | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/python/pyspark/sql/types.py b/python/pyspark/sql/types.py
index 1d24c40..0d73963 100644
--- a/python/pyspark/sql/types.py
+++ b/python/pyspark/sql/types.py
@@ -1466,6 +1466,12 @@ class Row(tuple):
:param recursive: turns the nested Row as 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,
+ one of the duplicate fields will be selected by ``asDict``.
``__getitem__``
+ will also return one of the duplicate fields, however returned
value might
+ be different to ``asDict``.
+
>>> Row(name="Alice", age=11).asDict() == {'name': 'Alice', 'age': 11}
True
>>> row = Row(key=1, value=Row(name='a', age=2))
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