Drew Kelleher contributed to the cockroachdb/cockroach repository by building advanced SQL engine features, including vector search capabilities, a statement hints framework, and robust dependency tracking for routines and views. He approached these projects with deep backend development and database internals expertise, using Go and SQL to implement new operators, optimize query planning, and enhance performance for complex workloads. His work included targeted refactors for maintainability, expanded test coverage for reliability, and improvements to observability and error handling. Drew’s engineering demonstrated a strong grasp of distributed systems and system design, delivering well-tested, maintainable solutions that improved correctness and operational safety.
Summary for 2025-10: Focused on reliability and performance of the Statement Hints Cache in cockroachdb/cockroach. Delivered enhancements to cache correctness, invalidation of stale plans, test stabilization, and logging improvements to reduce noise, resulting in more stable performance and faster iteration cycles.
Summary for 2025-10: Focused on reliability and performance of the Statement Hints Cache in cockroachdb/cockroach. Delivered enhancements to cache correctness, invalidation of stale plans, test stabilization, and logging improvements to reduce noise, resulting in more stable performance and faster iteration cycles.
In September 2025, the CockroachDB repository (cockroachdb/cockroach) delivered a new Statement Hints Framework with caching, improved query planning performance, and addressed critical correctness and reliability issues. The main deliverables include an end-to-end hints solution with a new hints package, the system.statement_hints table, and per-node caching, supported by comprehensive tests. In addition, targeted bug fixes improved explain analyze accuracy, zone-behavior, and test stability. These work items collectively increase performance predictability, data correctness, and operational reliability while expanding the platform’s SQL-driven optimization capabilities.
In September 2025, the CockroachDB repository (cockroachdb/cockroach) delivered a new Statement Hints Framework with caching, improved query planning performance, and addressed critical correctness and reliability issues. The main deliverables include an end-to-end hints solution with a new hints package, the system.statement_hints table, and per-node caching, supported by comprehensive tests. In addition, targeted bug fixes improved explain analyze accuracy, zone-behavior, and test stability. These work items collectively increase performance predictability, data correctness, and operational reliability while expanding the platform’s SQL-driven optimization capabilities.
August 2025: Delivered key observability and maintainability improvements in cockroachdb/cockroach. Enhanced SQL error reporting and visibility by not redacting the post-query action type and by attaching AST and plan gist to Sentry for SQL errors, and performed a targeted SQL helper cleanup by removing an unused ClientNoticeSender parameter to simplify signatures. No functional changes beyond improved diagnostics.
August 2025: Delivered key observability and maintainability improvements in cockroachdb/cockroach. Enhanced SQL error reporting and visibility by not redacting the post-query action type and by attaching AST and plan gist to Sentry for SQL errors, and performed a targeted SQL helper cleanup by removing an unused ClientNoticeSender parameter to simplify signatures. No functional changes beyond improved diagnostics.
Monthly summary for 2025-07: Focused reliability and testing improvements in cockroachdb/cockroach. Delivered targeted nil-safety for evalCtx.Regions in SQL builtins to prevent NPEs during constant folding, and expanded transaction interception tests to validate leaf state population. These changes reduce crash risk in optimizer tests, improve stability across read spans, and demonstrate solid Go engineering practices in internal SQL, txn, and testing layers.
Monthly summary for 2025-07: Focused reliability and testing improvements in cockroachdb/cockroach. Delivered targeted nil-safety for evalCtx.Regions in SQL builtins to prevent NPEs during constant folding, and expanded transaction interception tests to validate leaf state population. These changes reduce crash risk in optimizer tests, improve stability across read spans, and demonstrate solid Go engineering practices in internal SQL, txn, and testing layers.
June 2025 monthly summary: Delivered core enhancements across dependency tracking, regional data locality, and schema-evolution safety, complemented by expanded testing and a targeted bug fix. Notable work includes: session-based routine dependency improvements with optimized handling of RETURNING clauses; Regional By Row enhancements with region column inference and related catalog/schema-changer support; improved view/UDF dependency tracking for schema evolution; and broadened test/benchmark coverage (ClickBench, TPCH, TPC-DS) with an Extended Protocol portal fix for PL/pgSQL txn control.
June 2025 monthly summary: Delivered core enhancements across dependency tracking, regional data locality, and schema-evolution safety, complemented by expanded testing and a targeted bug fix. Notable work includes: session-based routine dependency improvements with optimized handling of RETURNING clauses; Regional By Row enhancements with region column inference and related catalog/schema-changer support; improved view/UDF dependency tracking for schema evolution; and broadened test/benchmark coverage (ClickBench, TPCH, TPC-DS) with an Extended Protocol portal fix for PL/pgSQL txn control.
May 2025 performance summary for cockroachdb/cockroach focused on optimizer enhancements, stability improvements, and enabling faster optimization cycles with business value in latency-sensitive workloads. Delivered control over EXISTS subquery optimizations, stabilized vector search behavior, expanded optimizer test coverage for cascades/triggers, and completed a targeted SQL execution engine refactor to facilitate safer future changes. These changes improve plan quality, reduce risk in production plans, and enable earlier and more reliable optimizations for complex queries.
May 2025 performance summary for cockroachdb/cockroach focused on optimizer enhancements, stability improvements, and enabling faster optimization cycles with business value in latency-sensitive workloads. Delivered control over EXISTS subquery optimizations, stabilized vector search behavior, expanded optimizer test coverage for cascades/triggers, and completed a targeted SQL execution engine refactor to facilitate safer future changes. These changes improve plan quality, reduce risk in production plans, and enable earlier and more reliable optimizations for complex queries.
April 2025 performance summary for cockroachdb/cockroach shows a strong mix of PL/pgSQL enhancements, vector search improvements, and safety/stability improvements across triggers, vector indexing, and leaf-transaction controls. The team concentrated on expanding capabilities for stored procedures, tightening safety around triggers, and boosting vector search performance and reliability, while also improving testing and QA coverage to reduce risk in production deployments. Key work focused on feature delivery, bug fixes, and reliability improvements with tangible business value in developer productivity, query performance, and operational safety.
April 2025 performance summary for cockroachdb/cockroach shows a strong mix of PL/pgSQL enhancements, vector search improvements, and safety/stability improvements across triggers, vector indexing, and leaf-transaction controls. The team concentrated on expanding capabilities for stored procedures, tightening safety around triggers, and boosting vector search performance and reliability, while also improving testing and QA coverage to reduce risk in production deployments. Key work focused on feature delivery, bug fixes, and reliability improvements with tangible business value in developer productivity, query performance, and operational safety.
March 2025 monthly summary for cockroachdb/cockroach focusing on performance-oriented planner and execution improvements, expanded PL/pgSQL capabilities, and enhanced observability. Key work includes enabling reverse scans in lookup joins, vector search enhancements, and remapping Project operators above Joins to tighten plan shapes. Added distributability checks, standardized result column naming, and improved SQL instrumentation. Fixed critical correctness issues and improved reliability through targeted bug fixes and better diagnostics.
March 2025 monthly summary for cockroachdb/cockroach focusing on performance-oriented planner and execution improvements, expanded PL/pgSQL capabilities, and enhanced observability. Key work includes enabling reverse scans in lookup joins, vector search enhancements, and remapping Project operators above Joins to tighten plan shapes. Added distributability checks, standardized result column naming, and improved SQL instrumentation. Fixed critical correctness issues and improved reliability through targeted bug fixes and better diagnostics.
February 2025 – CockroachDB vector work: Delivered core vector capabilities and foundational refactors to enable vector data workloads, with a clear line of sight to business value and reliability. Key features delivered: (1) Vector search in the SQL engine with VectorSearch and VectorMutationSearch operators, plus execution paths for vector indexing and querying (commits: bd35f4202c9ab0e86d15d168b02c8c5167d16887; 49bf61d60c72d7b16dec24de8248c48f667ab0e7). (2) Vector index mutation improvements, including prefix/suffix handling and multi-column suffix support to preserve order and improve mutation planning (commits: 8c36d1d25e807302d2e7bce2844af1ed1639d6c9; 40d009d29f9df812fe5ae13a3be2e69bc2630ee0; 877fc6a659c83acbb578ce7e0b0717fe0d8c9be2). (3) Planning groundwork for vectorized COPY inserts and DistSQL operator plumbing to enable future vector data workflows (commits: e2bbd6c7e40ce5bb5debdb0b40220009fb4bad88; 69670e892861041357d583539a0a5082a97ee2de). (4) Internal SQL engine refactors to support vector features, including cursors, fetchers, planning info, and DistSQL components for improved reliability (multiple commits listed). (5) Exposed EncodeConstraintKey API for external use with tests validating various inputs and column directions (commit: a9ac923ddfa94d42196ec88d2aaaed0402689167).
February 2025 – CockroachDB vector work: Delivered core vector capabilities and foundational refactors to enable vector data workloads, with a clear line of sight to business value and reliability. Key features delivered: (1) Vector search in the SQL engine with VectorSearch and VectorMutationSearch operators, plus execution paths for vector indexing and querying (commits: bd35f4202c9ab0e86d15d168b02c8c5167d16887; 49bf61d60c72d7b16dec24de8248c48f667ab0e7). (2) Vector index mutation improvements, including prefix/suffix handling and multi-column suffix support to preserve order and improve mutation planning (commits: 8c36d1d25e807302d2e7bce2844af1ed1639d6c9; 40d009d29f9df812fe5ae13a3be2e69bc2630ee0; 877fc6a659c83acbb578ce7e0b0717fe0d8c9be2). (3) Planning groundwork for vectorized COPY inserts and DistSQL operator plumbing to enable future vector data workflows (commits: e2bbd6c7e40ce5bb5debdb0b40220009fb4bad88; 69670e892861041357d583539a0a5082a97ee2de). (4) Internal SQL engine refactors to support vector features, including cursors, fetchers, planning info, and DistSQL components for improved reliability (multiple commits listed). (5) Exposed EncodeConstraintKey API for external use with tests validating various inputs and column directions (commit: a9ac923ddfa94d42196ec88d2aaaed0402689167).
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