Node Infrastructure | Agent Skills Atlas

About this skill

PostgreSQL's Node type system — the tagged-union polymorphism used for parser output (Query, RangeTblEntry), planner output (Path, Plan), executor state (PlanState, ExprState), and every intermediate representation. Covers src/backend/nodes/gennodesupport.pl (the code generator) + src/include/nodes/.h + the copy/equal/out/read function families + walker/mutator support (nodeFuncs.c). Loads when the user asks about NodeTag, adding a new Node type (has scenario add-new-node-type), expressiontreewalker / expressiontreemutator, why grammar changes require regenerating nodes.h, the TFoo enum, or castNode / nodeTag macros. Skip when the ask is about a specific Node (e.g. SeqScan, HashJoin) — those live under executor/optimizer skills.

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Automated security scan: Partial

Only SKILL.md was scanned. Supporting files and scripts were not checked. No safety grade has been assigned.

0 potential findings · Scanned 11/4/2026 · Scanner 0.2.1

Content SHA-256: b9a1cbe929fda86709865c51fc05f1745914a773d8ca039c20f1bf7150077b82

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Original listing metadata

Original name

node-infrastructure

Original description

PostgreSQL's Node type system — the tagged-union polymorphism used for parser output (Query, RangeTblEntry), planner output (Path, Plan), executor state (PlanState, ExprState), and every intermediate representation. Covers `src/backend/nodes/gen_node_support.pl` (the code generator) + `src/include/nodes/*.h` + the copy/equal/out/read function families + walker/mutator support (`nodeFuncs.c`). Loads when the user asks about `NodeTag`, adding a new Node type (has scenario `add-new-node-type`), `expression_tree_walker` / `expression_tree_mutator`, why grammar changes require regenerating `nodes.h`, the `T_Foo` enum, or `castNode` / `nodeTag` macros. Skip when the ask is about a specific Node (e.g. SeqScan, HashJoin) — those live under executor/optimizer skills.

About this listing

Category: Engineering
Reported license: PostgreSQL
Listing language (estimated): English
Review status: Not individually reviewed
Agent compatibility: Atlas installation supports Claude Code, Codex, and Cursor. Skill-specific dependencies and features are checked during setup.