[SPARK-31441] Support duplicated column names for toPandas with arrow execution. by ueshin · Pull Request #28210 · apache/spark

ueshin · 2020-04-14T02:01:05Z

What changes were proposed in this pull request?

This PR is adding support duplicated column names for toPandas with Arrow execution.

Why are the changes needed?

When we execute toPandas() with Arrow execution, it fails if the column names have duplicates.

>>>spark.sql("select 1 v, 1 v").toPandas()
Traceback (mostrecentcalllast):
File"<stdin>", line1, in<module>File"/path/to/lib/python3.7/site-packages/pyspark/sql/dataframe.py", line2132, intoPandaspdf=table.to_pandas()
File"pyarrow/array.pxi", line441, inpyarrow.lib._PandasConvertible.to_pandasFile"pyarrow/table.pxi", line1367, inpyarrow.lib.Table._to_pandasFile"/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line653, intable_to_blockmanagercolumns=_deserialize_column_index(table, all_columns, column_indexes)
File"/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line704, in_deserialize_column_indexcolumns=_flatten_single_level_multiindex(columns)
File"/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line937, in_flatten_single_level_multiindexraiseValueError('Found non-unique column index')
ValueError: Foundnon-uniquecolumnindex

Does this PR introduce any user-facing change?

Yes, previously we will face an error above, but after this PR, we will see the result:

>>>spark.sql("select 1 v, 1 v").toPandas()
vv011

How was this patch tested?

Added and modified related tests.

SparkQA · 2020-04-14T02:51:05Z

Test build #121244 has finished for PR 28210 at commit 762d9dc.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

HyukjinKwon · 2020-04-14T05:08:43Z

The last comment was comment only. Merged to master and branch-3.0.

HyukjinKwon · 2020-04-14T05:09:25Z

Should we backport this and SPARK-31186, @viirya and @ueshin?

SparkQA · 2020-04-14T05:09:25Z

Test build #121250 has finished for PR 28210 at commit 8ecdf33.

This patch fails PySpark unit tests.
This patch merges cleanly.
This patch adds no public classes.

… execution ### What changes were proposed in this pull request? This PR is adding support duplicated column names for `toPandas` with Arrow execution. ### Why are the changes needed? When we execute `toPandas()` with Arrow execution, it fails if the column names have duplicates. ```py >>> spark.sql("select 1 v, 1 v").toPandas() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/path/to/lib/python3.7/site-packages/pyspark/sql/dataframe.py", line 2132, in toPandas pdf = table.to_pandas() File "pyarrow/array.pxi", line 441, in pyarrow.lib._PandasConvertible.to_pandas File "pyarrow/table.pxi", line 1367, in pyarrow.lib.Table._to_pandas File "/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 653, in table_to_blockmanager columns = _deserialize_column_index(table, all_columns, column_indexes) File "/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 704, in _deserialize_column_index columns = _flatten_single_level_multiindex(columns) File "/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 937, in _flatten_single_level_multiindex raise ValueError('Found non-unique column index') ValueError: Found non-unique column index ``` ### Does this PR introduce any user-facing change? Yes, previously we will face an error above, but after this PR, we will see the result: ```py >>> spark.sql("select 1 v, 1 v").toPandas() v v 0 1 1 ``` ### How was this patch tested? Added and modified related tests. Closes#28210 from ueshin/issues/SPARK-31441/to_pandas. Authored-by: Takuya UESHIN <ueshin@databricks.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org> (cherry picked from commit 87be364) Signed-off-by: HyukjinKwon <gurwls223@apache.org>

viirya · 2020-04-14T06:01:13Z

@HyukjinKwon Backport to branch-2.4? Ok, sounds good to me. I will prepare a backport of SPARK-31186.

ueshin · 2020-04-14T17:09:08Z

@HyukjinKwon Sure, I'll submit the backport PR after @viirya's is merged.

… execution ### What changes were proposed in this pull request? This PR is adding support duplicated column names for `toPandas` with Arrow execution. ### Why are the changes needed? When we execute `toPandas()` with Arrow execution, it fails if the column names have duplicates. ```py >>> spark.sql("select 1 v, 1 v").toPandas() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/path/to/lib/python3.7/site-packages/pyspark/sql/dataframe.py", line 2132, in toPandas pdf = table.to_pandas() File "pyarrow/array.pxi", line 441, in pyarrow.lib._PandasConvertible.to_pandas File "pyarrow/table.pxi", line 1367, in pyarrow.lib.Table._to_pandas File "/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 653, in table_to_blockmanager columns = _deserialize_column_index(table, all_columns, column_indexes) File "/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 704, in _deserialize_column_index columns = _flatten_single_level_multiindex(columns) File "/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 937, in _flatten_single_level_multiindex raise ValueError('Found non-unique column index') ValueError: Found non-unique column index ``` ### Does this PR introduce any user-facing change? Yes, previously we will face an error above, but after this PR, we will see the result: ```py >>> spark.sql("select 1 v, 1 v").toPandas() v v 0 1 1 ``` ### How was this patch tested? Added and modified related tests. Closesapache#28210 from ueshin/issues/SPARK-31441/to_pandas. Authored-by: Takuya UESHIN <ueshin@databricks.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org>

…toPandas with arrow execution ### What changes were proposed in this pull request? This is to backport #28210. This PR is adding support duplicated column names for `toPandas` with Arrow execution. ### Why are the changes needed? When we execute `toPandas()` with Arrow execution, it fails if the column names have duplicates. ```py >>> spark.sql("select 1 v, 1 v").toPandas() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/path/to/lib/python3.7/site-packages/pyspark/sql/dataframe.py", line 2132, in toPandas pdf = table.to_pandas() File "pyarrow/array.pxi", line 441, in pyarrow.lib._PandasConvertible.to_pandas File "pyarrow/table.pxi", line 1367, in pyarrow.lib.Table._to_pandas File "/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 653, in table_to_blockmanager columns = _deserialize_column_index(table, all_columns, column_indexes) File "/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 704, in _deserialize_column_index columns = _flatten_single_level_multiindex(columns) File "/path/to/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 937, in _flatten_single_level_multiindex raise ValueError('Found non-unique column index') ValueError: Found non-unique column index ``` ### Does this PR introduce any user-facing change? Yes, previously we will face an error above, but after this PR, we will see the result: ```py >>> spark.sql("select 1 v, 1 v").toPandas() v v 0 1 1 ``` ### How was this patch tested? Added and modified related tests. Closes#28221 from ueshin/issues/SPARK-31441/2.4/to_pandas. Authored-by: Takuya UESHIN <ueshin@databricks.com> Signed-off-by: Takuya UESHIN <ueshin@databricks.com>

gatorsmile · 2020-04-19T20:24:36Z

For other reviewers, this PR is the follow-up of #28025

…mn names ### What changes were proposed in this pull request? Fixes `DataFrame.toPandas` to handle duplicated column names. ### Why are the changes needed? Currently ```py spark.sql("select 1 v, 1 v").toPandas() ``` fails with the error: ```py Traceback (most recent call last): ... File ".../python/pyspark/sql/connect/dataframe.py", line 1335, in toPandas return self._session.client.to_pandas(query) File ".../python/pyspark/sql/connect/client.py", line 548, in to_pandas pdf = table.to_pandas() File "pyarrow/array.pxi", line 830, in pyarrow.lib._PandasConvertible.to_pandas File "pyarrow/table.pxi", line 3908, in pyarrow.lib.Table._to_pandas File "/.../lib/python3.9/site-packages/pyarrow/pandas_compat.py", line 819, in table_to_blockmanager columns = _deserialize_column_index(table, all_columns, column_indexes) File "/.../lib/python3.9/site-packages/pyarrow/pandas_compat.py", line 938, in _deserialize_column_index columns = _flatten_single_level_multiindex(columns) File "/.../lib/python3.9/site-packages/pyarrow/pandas_compat.py", line 1186, in _flatten_single_level_multiindex raise ValueError('Found non-unique column index') ValueError: Found non-unique column index ``` Simliar to #28210. ### Does this PR introduce _any_ user-facing change? Duplicated column names will be available when calling `toPandas()`. ### How was this patch tested? Enabled related tests. Closes#40170 from ueshin/issues/SPARK-42574/toPandas. Authored-by: Takuya UESHIN <ueshin@databricks.com> Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

…mn names ### What changes were proposed in this pull request? Fixes `DataFrame.toPandas` to handle duplicated column names. ### Why are the changes needed? Currently ```py spark.sql("select 1 v, 1 v").toPandas() ``` fails with the error: ```py Traceback (most recent call last): ... File ".../python/pyspark/sql/connect/dataframe.py", line 1335, in toPandas return self._session.client.to_pandas(query) File ".../python/pyspark/sql/connect/client.py", line 548, in to_pandas pdf = table.to_pandas() File "pyarrow/array.pxi", line 830, in pyarrow.lib._PandasConvertible.to_pandas File "pyarrow/table.pxi", line 3908, in pyarrow.lib.Table._to_pandas File "/.../lib/python3.9/site-packages/pyarrow/pandas_compat.py", line 819, in table_to_blockmanager columns = _deserialize_column_index(table, all_columns, column_indexes) File "/.../lib/python3.9/site-packages/pyarrow/pandas_compat.py", line 938, in _deserialize_column_index columns = _flatten_single_level_multiindex(columns) File "/.../lib/python3.9/site-packages/pyarrow/pandas_compat.py", line 1186, in _flatten_single_level_multiindex raise ValueError('Found non-unique column index') ValueError: Found non-unique column index ``` Simliar to #28210. ### Does this PR introduce _any_ user-facing change? Duplicated column names will be available when calling `toPandas()`. ### How was this patch tested? Enabled related tests. Closes#40170 from ueshin/issues/SPARK-42574/toPandas. Authored-by: Takuya UESHIN <ueshin@databricks.com> Signed-off-by: Hyukjin Kwon <gurwls223@apache.org> (cherry picked from commit 89cf490) Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

…mn names ### What changes were proposed in this pull request? Fixes `DataFrame.toPandas` to handle duplicated column names. ### Why are the changes needed? Currently ```py spark.sql("select 1 v, 1 v").toPandas() ``` fails with the error: ```py Traceback (most recent call last): ... File ".../python/pyspark/sql/connect/dataframe.py", line 1335, in toPandas return self._session.client.to_pandas(query) File ".../python/pyspark/sql/connect/client.py", line 548, in to_pandas pdf = table.to_pandas() File "pyarrow/array.pxi", line 830, in pyarrow.lib._PandasConvertible.to_pandas File "pyarrow/table.pxi", line 3908, in pyarrow.lib.Table._to_pandas File "/.../lib/python3.9/site-packages/pyarrow/pandas_compat.py", line 819, in table_to_blockmanager columns = _deserialize_column_index(table, all_columns, column_indexes) File "/.../lib/python3.9/site-packages/pyarrow/pandas_compat.py", line 938, in _deserialize_column_index columns = _flatten_single_level_multiindex(columns) File "/.../lib/python3.9/site-packages/pyarrow/pandas_compat.py", line 1186, in _flatten_single_level_multiindex raise ValueError('Found non-unique column index') ValueError: Found non-unique column index ``` Simliar to apache#28210. ### Does this PR introduce _any_ user-facing change? Duplicated column names will be available when calling `toPandas()`. ### How was this patch tested? Enabled related tests. Closesapache#40170 from ueshin/issues/SPARK-42574/toPandas. Authored-by: Takuya UESHIN <ueshin@databricks.com> Signed-off-by: Hyukjin Kwon <gurwls223@apache.org> (cherry picked from commit 89cf490) Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

Support duplicated column names for toPandas with arrow execution.
762d9dc

ueshin requested review from HyukjinKwon and viirya April 14, 2020 02:01

probot-autolabelerBot added PYTHON SQL labels Apr 14, 2020

HyukjinKwon approved these changes Apr 14, 2020
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viirya approved these changes Apr 14, 2020
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Comment threadpython/pyspark/sql/pandas/conversion.py Outdated

Fix.
8ecdf33

HyukjinKwon closed this in 87be364Apr 14, 2020

ueshin mentioned this pull request Apr 15, 2020
[SPARK-31441][PYSPARK][SQL][2.4] Support duplicated column names for toPandas with arrow execution. #28221
Closed

ueshin mentioned this pull request Feb 25, 2023
[SPARK-42574][CONNECT][PYTHON] Fix toPandas to handle duplicated column names #40170
Closed

ueshin deleted the issues/SPARK-31441/to_pandas branch August 3, 2026 22:59

coderabbitaiBot mentioned this pull request Aug 6, 2026
ENH: add DataFrame._from_arrow for pandas-side arrow to DataFrame con… autodag-dev/pandas#210
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[SPARK-31441] Support duplicated column names for toPandas with arrow execution. - #28210

[SPARK-31441] Support duplicated column names for toPandas with arrow execution.#28210
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ueshin commented Apr 14, 2020

What changes were proposed in this pull request?

Why are the changes needed?

Does this PR introduce any user-facing change?

How was this patch tested?

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