feldera/feldera
May 2026 – May 2026
1 Month active
Languages Used
BashPythonRust
Technical Skills
Asynchronous ProgrammingData ProcessingPythonRustSQLbackend development
Gerd Zellweger
PROFILE
Gerd Zellweger
Worked on the feldera/feldera repository to enhance ad-hoc query capabilities by introducing Arrow IPC client APIs and Python integration, while deprecating the previous JSON streaming path. Leveraged Rust and Python to enable multi-statement ad-hoc requests, allowing non-PREPARE intermediate statements and improving backend flexibility. Focused on robust error handling by ensuring WebSocket query failures return non-zero exit codes and refining SQL parser diagnostics to provide clearer syntax feedback. Developed comprehensive regression tests for Arrow IPC round-trips, duplicate columns, and wide-integer scenarios, strengthening data fidelity and reliability. Emphasized asynchronous programming, backend development, and thorough end-to-end testing throughout the process.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
5Total
Bugs
2
Commits
5
Features
1
Lines of code
557
Activity Months1
Your Network
48 peopleSame Organization
@feldera.com10
Anand RamanMember
Ben PfaffMember
feldera-ciMember
feldera-botMember
Igor SmolyarMember
Jyotshna YaparlaMember
Lalith SureshMember
Leonid RyzhykMember
Mihai BudiuMember
Shared Repositories
38
Anand RamanMember
Anand RamanMember
Aru SahniMember
Ben PfaffMember
Ben PfaffMember
Karakatiza666Member
JensenMember
Daniel Philip WatsonMember
feldera-ciMember
Work History
May 2026
5 Commits • 1 Features
May 1, 2026May 2026 monthly summary for feldera/feldera focusing on key business and technical outcomes: Key features delivered: - Ad-hoc query enhancements: introduced Arrow IPC client APIs, Python integration, and deprecation of the JSON streaming path for ad-hoc queries; added tests and a smoke test for the arrow_ipc format. - Multi-statement ad-hoc support: relaxed restriction to allow non-PREPARE intermediate statements, enabling sequences like INSERT; final statement remains the streaming consumer. - Tests and reliability: added regression tests covering Arrow IPC round-trips, duplicate-column scenarios, and wide-integer fidelity to ensure data integrity across the new path. Major bugs fixed: - WebSocket error signaling: ensure non-zero exit code for ad-hoc WS query failures and improve error propagation; updated tests. (Fixes https://github.com/feldera/feldera/issues/4973) - SQL parser error messaging: unwrap diagnostic errors to surface precise line and column information for clearer syntax feedback. (Fixes https://github.com/feldera/feldera/issues/2526) Overall impact and accomplishments: - Significantly improved reliability and automation-friendliness of ad-hoc queries via Arrow IPC, with better error visibility and data fidelity. Expanded test coverage reduces regression risk and accelerates iteration for data users and developers. Technologies/skills demonstrated: - Rust and DataFusion-based backend improvements, Arrow IPC integration, Python exposure (pyarrow-dependent) and streaming protocol enhancements, comprehensive end-to-end testing, and improved error handling strategies.
5 Commits • 1 Features
May 1, 2026May 2026 monthly summary for feldera/feldera focusing on key business and technical outcomes: Key features delivered: - Ad-hoc query enhancements: introduced Arrow IPC client APIs, Python integration, and deprecation of the JSON streaming path for ad-hoc queries; added tests and a smoke test for the arrow_ipc format. - Multi-statement ad-hoc support: relaxed restriction to allow non-PREPARE intermediate statements, enabling sequences like INSERT; final statement remains the streaming consumer. - Tests and reliability: added regression tests covering Arrow IPC round-trips, duplicate-column scenarios, and wide-integer fidelity to ensure data integrity across the new path. Major bugs fixed: - WebSocket error signaling: ensure non-zero exit code for ad-hoc WS query failures and improve error propagation; updated tests. (Fixes https://github.com/feldera/feldera/issues/4973) - SQL parser error messaging: unwrap diagnostic errors to surface precise line and column information for clearer syntax feedback. (Fixes https://github.com/feldera/feldera/issues/2526) Overall impact and accomplishments: - Significantly improved reliability and automation-friendliness of ad-hoc queries via Arrow IPC, with better error visibility and data fidelity. Expanded test coverage reduces regression risk and accelerates iteration for data users and developers. Technologies/skills demonstrated: - Rust and DataFusion-based backend improvements, Arrow IPC integration, Python exposure (pyarrow-dependent) and streaming protocol enhancements, comprehensive end-to-end testing, and improved error handling strategies.
May 2026
Activity
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Quality Metrics
Correctness96.0%
Maintainability84.0%
Architecture88.0%
Performance84.0%
AI Usage24.0%
Skills & Technologies
Programming Languages
BashPythonRust
Technical Skills
Asynchronous ProgrammingData ProcessingPythonRustSQLbackend developmenterror handlingfull stack developmentscriptingtesting
Repositories Contributed To
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