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Kousuke Saruta

PROFILE

Kousuke Saruta

Over four months, Kousuke Saruta contributed to the xupefei/spark and apache/spark repositories by delivering features and fixes that improved security, compatibility, and test reliability. He implemented a Hive-compatible quote function in Spark SQL and PySpark, easing migration for Hive users by aligning quoting behavior. Saruta modernized ESLint configuration and clarified documentation to enhance code quality and developer guidance. He stabilized Oracle integration tests by customizing Docker images and tuning initialization parameters, reducing CI flakiness. Additionally, he upgraded Oracle JDBC compatibility by updating Docker images, ensuring stable ETL pipelines. His work leveraged Python, Scala, SQL, Docker, and integration testing.

Overall Statistics

Feature vs Bugs

67%Features

Repository Contributions

7Total
Bugs
2
Commits
7
Features
4
Lines of code
298
Activity Months4

Work History

February 2026

1 Commits • 1 Features

Feb 1, 2026

February 2026 monthly summary for apache/spark: Delivered the Oracle JDBC compatibility upgrade by updating the oracle-free docker image to 23.26.1-slim to ensure compatibility with the newer Oracle Database for JDBC sources. The change involved container image updates and validation via docker-integration tests, with no user-facing changes. The work strengthens reliability of JDBC data sources when Oracle DB versions evolve, supporting stable ETL pipelines and analytics.

October 2025

1 Commits

Oct 1, 2025

October 2025: Stabilized Spark Oracle integration tests by replacing the Oracle test Docker image with a customized image that adds configurable password initialization timeout. This change reduced flaky failures in OracleJoinPushdownIntegrationSuite, improved CI reliability, and reinforced test determinism. Work focused on test infrastructure, with the primary delivery being a safer integration testing environment and related improvements to test stability.

February 2025

1 Commits • 1 Features

Feb 1, 2025

February 2025 highlights for xupefei/spark: Delivered Hive-Compatible Quote Function and foundational support for Hive integration across SQL and Python interfaces. This work enables quoting with single quotes and escaping embedded quotes, aligning Spark's behavior with Hive expectations and reducing data-prep friction for users migrating pipelines.

December 2024

4 Commits • 2 Features

Dec 1, 2024

December 2024 – Xupefei/spark monthly summary: Security remediation, documentation improvements, and ESLint modernization delivered tangible business value through improved security posture, clearer guidance for build/run-time usage, and enhanced code quality.

Activity

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Quality Metrics

Correctness97.2%
Maintainability97.2%
Architecture97.2%
Performance97.2%
AI Usage20.0%

Skills & Technologies

Programming Languages

JavaJavaScriptMarkdownPythonScala

Technical Skills

Data ProcessingDatabase IntegrationDockerESLintIntegration TestingJavaScriptPython DevelopmentSQLScalaSparkTestingdependency managementdocumentationfront end developmentlinting

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

xupefei/spark

Dec 2024 Feb 2025
2 Months active

Languages Used

JavaScriptMarkdownJavaPythonScala

Technical Skills

ESLintJavaScriptSQLdependency managementdocumentationfront end development

apache/spark

Oct 2025 Feb 2026
2 Months active

Languages Used

Scala

Technical Skills

DockerIntegration TestingScalaDatabase IntegrationTesting