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Add null value handling when converting rows to Arrow tables for nullable fields that are missing from input data. This fixes KeyError when writing to Parquet with missing nullable fields.

Fixes #35791.


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Add null value handling when converting rows to Arrow tables for nullable fields that are missing from input data. This fixes KeyError when writing to Parquet with missing nullable fields, addressing issue apache#35791.
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Summary of Changes

Hello @liferoad, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a KeyError encountered in Apache Beam's Parquet I/O connector when writing data to Parquet files. Previously, if nullable fields were not present in the input data dictionaries, the write operation would fail. The implemented fix ensures that None is automatically used for such missing nullable fields, aligning with the defined schema and preventing runtime errors during data conversion to Arrow tables. A new test case has been added to validate this behavior.

Highlights

  • Parquet Write Logic: Modified the _ParquetWriteFn to gracefully handle cases where nullable fields are absent from the input row dictionaries. Instead of raising a KeyError, it now inserts None for these missing fields, ensuring robust data conversion to Arrow tables.
  • Test Coverage: Introduced a new test case, test_write_with_nullable_fields_missing_data, which specifically validates the fix by simulating input data with missing nullable fields and asserting that the Parquet write operation completes successfully with None values inserted as expected.
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Assigning reviewers:

R: @shunping for label python.

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@liferoad liferoad requested review from Abacn and shunping August 27, 2025 01:10
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LGTM

@shunping shunping merged commit 2bcca48 into apache:master Aug 27, 2025
93 of 94 checks passed
damccorm added a commit that referenced this pull request Aug 27, 2025
* sdks/python: properly make milvus as extra dependency

* sdks/python: update image requirements

* .github: trigger postcommit python

* sdks/python: fix linting issues

* sdks/python: fix formatting issues

* .github: trigger beam postcommit python

* sdks/python: revert milvus version in itests

* sdks/python: update image requirements

* trigger_files: trigger postcommit python

* Bump github.com/docker/go-connections from 0.5.0 to 0.6.0 in /sdks (#35906)

Bumps [github.com/docker/go-connections](https://github.com/docker/go-connections) from 0.5.0 to 0.6.0.
- [Commits](docker/go-connections@v0.5.0...v0.6.0)

---
updated-dependencies:
- dependency-name: github.com/docker/go-connections
  dependency-version: 0.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* Add the readme link to new YAML examples (#35941)

* Bump google.golang.org/api from 0.247.0 to 0.248.0 in /sdks (#35969)

* Remove mysql-connector-python dependency (#35932)

* Fix typos and update test implementation from #35656 (#35958)

* implement lambda name pickling in cloudpickle

* add enable_lambda_name to __init__

* fix formatting and lint

* fix typo

* fix code paths in test

* fix tests

* fix lint

* fix formatting and failing test

* fix formatting again

* remove cloudpickle implementation to leave only typo fixes and fixing test structure.

* fix _make_function typo

* revert regex

* fix failing tests

* fix formatting

* update prefix to not hardcode

* feat(mongodb): upgrade MongoDB Java driver to version 5.5.0 (#35946)

* feat(mongodb): upgrade MongoDB Java driver to version 5.5.0

Update MongoDB Java driver from 3.12.11 to 5.5.0 and refactor code to use new API
Add mongo-bson dependency required by new driver version
Replace deprecated MongoClient with MongoClients and update GridFS implementation

* refactor(mongodb): update MongoDB client usage to modern API

Replace deprecated MongoClient with MongoClients.create() and update database drop method

* build(dependencies): add mongodb driver core dependency

Add mongodb-driver-core to support MongoDB Java driver functionality.
Also mark mongo_java_driver as permitUnusedDeclared and add testImplementation.

* fix(mongodb): update embedded mongo version and fix split key filtering

Update embedded MongoDB test dependency to version 3.5.4 and simplify split key filtering logic by using BsonObjectId for range queries. This ensures proper type handling when filtering MongoDB documents by _id field.

* build: add mongodb-driver-core dependency

Add mongodb-driver-core version 5.5.0 to support MongoDB Java driver functionality

* use version

* refactor: simplify mongo client creation logic

Remove redundant null check and consolidate uri handling in MongoDbGridFSIO

* Bump github.com/aws/aws-sdk-go-v2/credentials in /sdks (#35974)

Bumps [github.com/aws/aws-sdk-go-v2/credentials](https://github.com/aws/aws-sdk-go-v2) from 1.18.6 to 1.18.7.
- [Release notes](https://github.com/aws/aws-sdk-go-v2/releases)
- [Changelog](https://github.com/aws/aws-sdk-go-v2/blob/config/v1.18.7/CHANGELOG.md)
- [Commits](aws/aws-sdk-go-v2@config/v1.18.6...config/v1.18.7)

---
updated-dependencies:
- dependency-name: github.com/aws/aws-sdk-go-v2/credentials
  dependency-version: 1.18.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* Bump google.golang.org/grpc from 1.74.2 to 1.75.0 in /sdks (#35971)

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.74.2 to 1.75.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.74.2...v1.75.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-version: 1.75.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* Override localhost endpoint when a worker is running in docker on mac (#35964)

* fix(parquetio): handle missing nullable fields in row conversion (#35948)

* fix(parquetio): handle missing nullable fields in row conversion

Add null value handling when converting rows to Arrow tables for nullable fields that are missing from input data. This fixes KeyError when writing to Parquet with missing nullable fields, addressing issue #35791.

* fix lint

* Bump cloud.google.com/go/storage from 1.56.0 to 1.56.1 in /sdks (#35980)

Bumps [cloud.google.com/go/storage](https://github.com/googleapis/google-cloud-go) from 1.56.0 to 1.56.1.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/main/CHANGES.md)
- [Commits](googleapis/google-cloud-go@spanner/v1.56.0...storage/v1.56.1)

---
updated-dependencies:
- dependency-name: cloud.google.com/go/storage
  dependency-version: 1.56.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* [Prism] Fix segv when docker container self-terminated. (#35977)

* Fix segv when docker container is self-terminated

* Add some debug logging for docker and process env.

* add a jinja % include/import pipeline example to docs (#35931)

* add a jinja include pipeline example

* update yaml doc with import example

* address gemini and other comments

* fix table of contents for readme

* add link to jinja pipeline examples

* Bump github.com/aws/aws-sdk-go-v2/config from 1.31.2 to 1.31.3 in /sdks (#35983)

* Add a security GCP log analyzer (#35922)

* Add the base log_analyzer

* Add github action for security logging

* Enhance LogAnalyzer to filter logs by time range and include file names in event summary

* Add dry-run option for weekly email report generation in LogAnalyzer

* Better error handling for timezones and missing details

* Refactor LogAnalyzer to use SinkCls for type consistency and enhance bucket permission management for log sinks

* update py containers (#35982)

* [YAML]: add import jinja pipeline example (#35945)

* add import jinja pipeline example

* revert name change

* update overall examples readme

* fix lint issue

* fix gemini small issue

* Update sdks/python/apache_beam/yaml/examples/transforms/jinja/import/README.md

---------

Co-authored-by: tvalentyn <tvalentyn@users.noreply.github.com>

* workflows: capture DinD tests in PreCommit Py Coverage workflow

* workflows: temporarily removing `ubuntu-latest` till resolving deps

* workflows: add `matrix.os` label to `beam_PreCommit_Python_Coverage`

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: Mohamed Awnallah <mohamedmohey2352@gmail.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Chamikara Jayalath <chamikaramj@gmail.com>
Co-authored-by: Yi Hu <yathu@google.com>
Co-authored-by: kristynsmith <kristynsmith@google.com>
Co-authored-by: liferoad <huxiangqian@gmail.com>
Co-authored-by: Shunping Huang <shunping@google.com>
Co-authored-by: Derrick Williams <derrickaw@google.com>
Co-authored-by: Enrique Calderon <71863693+ksobrenat32@users.noreply.github.com>
Co-authored-by: Ahmed Abualsaud <65791736+ahmedabu98@users.noreply.github.com>
Co-authored-by: tvalentyn <tvalentyn@users.noreply.github.com>
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[Bug]: WriteToParquet fails with nullable fields defined in PyArrow schema

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