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PostgreSQL 19 saw an unusually high number of feature reverts during beta — around 8-10 major ones — largely because LLM-assisted code review is now catching edge cases and architectural issues that would have been discovered and fixed gradually over years in the past. A security crisis also pulled senior developers away during the critical beta review period, compressing the timeline to address problems.
- LLM-assisted code review is surfacing defects far faster than manual review ever did, creating a backlog of fixes that can't be completed in time; features written before this tool existed now face a higher quality bar retroactively.
- The "Vulnpocalypse" security event between April and August pulled experienced reviewers away during beta, delaying discovery of issues until late in the cycle when there wasn't enough time to fix them without missing the release date.
- PostgreSQL's design principle that "everything works with everything" — like features working across domains, composite types, partitions, views, and triggers in combination — creates exponential test complexity that manual testing can't handle but LLM fuzzing exposes instantly.
- The community is considering an "experimental" feature status to let complex features mature in the main tree rather than being reverted, which could have helped several of the affected features.
A developer measured five common SQL patterns that force PostgreSQL to do unnecessary work—UNION instead of UNION ALL, MATERIALIZED CTEs, ORDER BY random(), SELECT * instead of specific columns, and unindexed expressions—and found gaps ranging from 20x to 4,000x slower on a 2 million row table.
- UNION deduplicated 2 million rows unnecessarily (13.6s) versus UNION ALL (0.68s) when the developer knew the halves couldn't overlap
- MATERIALIZED keyword forced PostgreSQL to build the entire CTE before filtering, turning a 0.24ms query into 1,973ms
- ORDER BY random() LIMIT 1 sorted all 2 million rows to get one (1,313ms); TABLESAMPLE SYSTEM did it in 0.3ms, though with different guarantees
- SELECT * required visiting the table for every row (1,718 buffers, 64.8ms) versus querying just the indexed column (279 buffers, 32.8ms)
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