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javier merged 1 commit into from
May 29, 2026
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Update changelog: late May 2026 entries and 9.4.0 release #457

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10 changes: 10 additions & 0 deletions documentation/changelog.mdx
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Expand Up @@ -10,14 +10,22 @@ This page tracks significant updates to the QuestDB documentation.

## May 2026

### Releases

- [9.4.0](https://questdb.com/release-notes/) - Released May 18, 2026

### New

- [Out-of-order data](/docs/concepts/out-of-order-data/) - New concept page covering O3 behavior per ingestion method, engine mechanics, write amplification (with the `table_write_amp_*` columns), tuning, and common scenarios
- [Posting index and covering index](/docs/concepts/deep-dive/posting-index/) - New deep-dive on posting indexes, plus covering index documentation across `CREATE TABLE`, `ALTER TABLE`, `SHOW`, `EXPLAIN`, and schema design
- [Order Flow Imbalance (OFI)](/docs/cookbook/sql/finance/order-flow-imbalance/) - Cookbook recipe using the Cont-Kukanov-Stoikov definition computed from L1 quote changes, with per-ECN and consolidated variants
- [Upgrade QuestDB](/docs/operations/upgrade/) - Guide for upgrading QuestDB versions
- [Table/column versioning](/docs/concepts/deep-dive/root-directory-structure/) - Added versioning info to root directory structure
- [DECLARE with Grafana time range](/docs/cookbook/integrations/grafana/declare-time-range/) - Pass Grafana dashboard time range into QuestDB `DECLARE` variables

### Reference

- Documented [gzip request compression](/docs/ingestion/ilp/overview/) for ILP/HTTP and updated [Telegraf](/docs/ingestion/message-brokers/telegraf/) guidance for QuestDB 9.1.0+
- Added [`ntile()`](/docs/query/functions/window-functions/reference/#ntile), [`cume_dist()`](/docs/query/functions/window-functions/reference/#cume_dist), and [`nth_value()`](/docs/query/functions/window-functions/reference/#nth_value) window functions
- Fixed `timestamp_ns` valid range documentation
- Added precise microsecond-grained timestamp examples for PHP clients
Expand All @@ -26,6 +34,8 @@ This page tracks significant updates to the QuestDB documentation.

### Updated

- [SQL extensions and compatibility](/docs/concepts/deep-dive/sql-extensions/) - Rewritten as the canonical SQL dialect reference covering time-series clauses and joins, query syntax conveniences, storage extensions, PIVOT vs SQL Server/PostgreSQL, JSON and UNNEST, and a full inventory of standard SQL features not supported with QuestDB equivalents. Sidebar entry moved to the top of Query & SQL Reference
- [systemd service example](/docs/deployment/systemd/) - Corrected JVM argument ordering, switched to `UseParallelGC`, set `-Dcontainerized=false`, and added required setup paths
- [Aggregation functions](/docs/query/functions/aggregation/) - Added demo tags and updated examples with runnable queries
- [LATEST ON](/docs/query/sql/latest-on/) - Added demo tags to examples
- [JOIN](/docs/query/sql/join/) - Updated examples to use demo data
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