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‎LICENSE‎

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‎META.json‎

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"name": "acdat",
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"abstract": "Compiled multi-pattern matching for PostgreSQL",
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"description": "Compiles large literal pattern sets into immutable Aho-Corasick double-array machines for one-pass text and bytea matching, extraction, replacement, and transactional dictionary lifecycle management.",
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"version": "0.2.0",
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"version": "0.1.1",
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"maintainer": [
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"Feng Ruohang <rh@vonng.com>"
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],
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"license": "postgresql",
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"release_status": "testing",
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"license": "apache_2_0",
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"release_status": "stable",
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"prereqs": {
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"runtime": {
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"requires": {
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},
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"provides": {
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"acdat": {
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"file": "sql/acdat--0.2.0.sql",
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"file": "sql/acdat--0.1.1.sql",
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"docfile": "docs/USAGE.md",
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"version": "0.2.0",
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"version": "0.1.1",
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"abstract": "Compiled multi-pattern matching for PostgreSQL"
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}
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},
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"resources": {
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"homepage": "https://github.com/Vonng/ac",
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"homepage": "https://github.com/pgsty/acdat",
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"bugtracker": {
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"web": "https://github.com/Vonng/ac/issues"
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"web": "https://github.com/pgsty/acdat/issues"
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},
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"repository": {
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"url": "https://github.com/Vonng/ac.git",
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"web": "https://github.com/Vonng/ac",
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"url": "https://github.com/pgsty/acdat.git",
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"web": "https://github.com/pgsty/acdat",
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"type": "git"
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}
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},

‎Makefile‎

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EXTENSION = acdat
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EXTVERSION = 0.2.0
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DISTVERSION = 0.2.0
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EXTVERSION = 0.1.1
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DISTVERSION = 0.1.1
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MODULE_big = acdat
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OBJS = src/acdat_pg.o src/acdat_core.o src/acdat_format.o
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DATA = sql/acdat--0.1.0.sql sql/acdat--0.1.0--0.2.0.sql \
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DATA = sql/acdat--0.1.0.sql sql/acdat--0.1.0--0.1.1.sql \
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sql/acdat--$(EXTVERSION).sql
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REGRESS = acdat_basic acdat_errors
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PGFILEDESC = "acdat - compiled multi-pattern matching for PostgreSQL"
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test -f "sql/$(EXTENSION)--0.1.0--$(EXTVERSION).sql"
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grep -Eq "^default_version[[:space:]]*=[[:space:]]*'$(EXTVERSION)'[[:space:]]*$$" \
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$(EXTENSION).control
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# Version 0.2.0 changes C code only; its full install SQL must stay identical.
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# Version 0.1.1 changes C code only; its full install SQL must stay identical.
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cmp -s sql/$(EXTENSION)--0.1.0.sql \
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sql/$(EXTENSION)--$(EXTVERSION).sql
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‎README.md‎

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# acdat
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Current release: [**0.1.1**](https://github.com/pgsty/acdat/releases/tag/v0.1.1)
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`acdat` is a PostgreSQL extension for compiling a large set of exact literal
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patterns once and scanning each `text` or `bytea` value once. The first engine
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uses an Aho-Corasick automaton packed into a Double-Array Trie.
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The current validation matrix covers PostgreSQL 14–18 on Linux amd64 with
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`-Werror`, plus PostgreSQL 18.4 on macOS arm64. Linux arm64 and package-lab
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verification remain release gates.
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verification remain additional validation targets.
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Documentation:
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## Legacy Go benchmark data
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The original 2018 Go implementation remains on the
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[`master`](https://github.com/Vonng/ac/tree/master) branch. Its optional
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[`master`](https://github.com/pgsty/acdat/tree/master) branch. Its optional
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10,318,163-line benchmark corpus is distributed as the
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[`benchmark-data-2018`](https://github.com/Vonng/ac/releases/tag/benchmark-data-2018)
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[`benchmark-data-2018`](https://github.com/pgsty/acdat/releases/tag/benchmark-data-2018)
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release instead of being stored in Git history. The corpus is not required to
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build or test the PostgreSQL extension.
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text and binary I/O. Imported artifacts are structurally validated before use.
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Hot scan expressions cache an already validated and materialized machine using
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the TOAST pointer/build fingerprint, so a large value is not detoasted per row.
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Version 0.2.0 also services PostgreSQL interrupts during DAT packing and places
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Version 0.1.1 also services PostgreSQL interrupts during DAT packing and places
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a conservative input-relative limit on base-candidate searches.
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`DROP EXTENSION acdat` deletes all managed dictionary state. It normally fails
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## License
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`acdat` is distributed under the [PostgreSQL License](LICENSE).
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`acdat` is distributed under the [Apache License 2.0](LICENSE).
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Copyright 2018-2026 Ruohang Feng.

‎acdat.control‎

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comment = 'Compiled multi-pattern matching for PostgreSQL'
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default_version = '0.2.0'
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default_version = '0.1.1'
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module_pathname = '$libdir/acdat'
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relocatable = false
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schema = 'acdat'

‎docs/BENCHMARK.md‎

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Apple M5 Max test host is recorded in
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[`PERFORMANCE.md`](PERFORMANCE.md).
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## 2026-08-24: v0.2.0 benchmark-gated changes
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## 2026-08-24: v0.1.1 benchmark-gated changes
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Environment:
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```
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The comparison baseline was captured with the expanded benchmark immediately
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before the v0.2.0 core changes. The workload generator and compiler settings
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before the v0.1.1 core changes. The workload generator and compiler settings
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were otherwise identical.
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| 100K profile | v0.1 build | v0.2 build | v0.1 scan | v0.2 scan |
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| 100K profile | v0.1.0 build | v0.1.1 build | v0.1.0 scan | v0.1.1 scan |
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|---|---:|---:|---:|---:|
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| ASCII miss | 0.280 s | 0.116 s | 59.97 MiB/s | 64.80 MiB/s |
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| Root-only miss | 0.278 s | 0.077 s | 449.67 MiB/s | 936.06 MiB/s |
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These are local engineering results, not cross-platform release claims. Linux
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amd64/arm64, PostgreSQL short-row, parallel-worker, and package-lab results
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remain separate release gates.
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remain separate validation targets.
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## 2026-08-22: byte256 ACDAT baseline
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‎docs/CHANGELOG.md‎

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# Changelog
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## 0.2.0 - 2026-08-24
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## 0.1.1 - 2026-09-03
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- Removed the unnecessary globally unique BASE constraint from the Basic
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parent-state CHECK builder, eliminating pathological UTF-8 dictionary build
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- Evaluated and rejected Packed runtime states and LexDFS placement because
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their workload-specific wins did not justify permanent selection complexity.
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- Preserved the 0.1.0 SQL API and machine format, with an extension update path
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to 0.2.0.
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to 0.1.1.
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- Moved the canonical repository to `pgsty/acdat` and refreshed project links
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and release metadata.
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- Relicensed the project under the Apache License 2.0.
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## 0.1.0 - 2026-08-22
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