plpgsql-internals
Skill1 starsChanged 6 months agoPostgreSQLView on GitHub
PostgreSQL's PL/pgSQL procedural-language implementation — `src/pl/plpgsql/src/` — the parser (`pl_gram.y` + `pl_scanner.c`), compiler (`pl_comp.c` — turns source text into `PLpgSQL_function` struct), executor (`pl_exec.c` — the interpreter with 268 KB of statement handlers), function/DO/procedure dispatch (`pl_handler.c`), and the trusted-language sandbox boundary. Loads when the user asks about PL/pgSQL semantics not obvious from SQL (nested exceptions, RAISE / GET STACKED DIAGNOSTICS, cursor lifecycle, RECORD variables, EXECUTE dynamic SQL, GET DIAGNOSTICS, transaction control from within a procedure, plan caching for expressions, or the trusted-vs-untrusted distinction), when investigating "why is my PL/pgSQL slower than raw SQL" (typically plan-cache or exception-block reasons), when adding a new PL/pgSQL feature (has scenario `integrate-with-plpgsql`), or when working with PL/pgSQL security (recall from `2026-06-04-a9-plpgsql` session that trusted-PL gate is enforced exactly twice in `pl_handler.c`, EXECUTE has zero injection defenses, WHEN OTHERS swallows almost everything). Skip when the ask is about PL/Python / PL/Perl / PL/Tcl (see the sibling `src/pl/plpython/` etc.), or about SPI (a shared API — see `fmgr-and-spi`).
In this repository59 other files it gives its agents.
- CLAUDE.mdCLAUDE.md
- llms.txtllms.txt
- access-method-apisSkill
- aio-readstreamSkill
- backup-and-recoverySkill
- bgworker-and-extensionsSkill
- buffer-managerSkill
- build-and-runSkill
- catalog-conventionsSkill
- coding-styleSkill
- collation-providerSkill
- commit-message-styleSkill
- copy-familySkill
- corpus-chainSkill
- custom-scan-apiSkill
- debuggingSkill
- error-handlingSkill
- executor-and-plannerSkill
- extended-statisticsSkill
- extension-developmentSkill
- fdw-developmentSkill
- fmgr-and-spiSkill
- free-space-mapSkill
- gucs-configSkill
- jsonpath-and-jsonbSkill
- lockingSkill
- logical-replicationSkill
- memory-contextsSkill
- memory-keepingSkill
- meta-commit-styleSkill
- multixactSkill
- node-infrastructureSkill
- parallel-querySkill
- parser-and-nodesSkill
- patch-submissionSkill
- pg-claudeSkill
- pg-feature-brainstormSkill
- pg-feature-planSkill
- pg-implementSkill
- pg-patch-reviewSkill
- pg-shadow-implementSkill
- pgstat-frameworkSkill
- pg-upgrade-internalsSkill
- physical-replicationSkill
- planner-cost-modelSkill
- process-lifecycleSkill
- psqlSkill
- replication-overviewSkill
- resource-ownersSkill
- review-checklistSkill
- row-level-securitySkill
- slru-infrastructureSkill
- snapshot-managementSkill
- testingSkill
- toast-storageSkill
- type-cacheSkill
- vacuum-autovacuumSkill
- wal-and-xlogSkill
- wire-protocolSkill
The file
We split this skill into the rules it gives an agent
6 rules. About 0 are common, 3 are distinctive, and 3 are very specific to this project.
≈0
Common · estimate
Many files like this have a rule of this kind.
≈3
Distinctive · estimate
This author's own choices. Worth a look.
3
Very specific
Tied to their project's names, files or tools. Probably skip.
Licensed with conditions — read it at the source. We count its rules but don't quote them. Read them on GitHub.
≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
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