feat: add function_metadata() datasource function#51
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Adds a builtin datasource function that exposes the runtime function
registry as queryable rows: { name, arity, category, private }.
Category is derived from existing engine predicates (window, aggregate,
aggregate-scalar, unnest, datasource, scalar), letting clients filter
instead of hardcoding function lists.
- BuiltinFunctions.getBuiltinFunctionIdentifiers(): read-only registry accessor
- FunctionMetadata{Rewriter,Datasource,Function,Reader}: modeled on jobs()/active_requests()
- registered (public) in MetadataBuiltinFunctions
- runtime test under misc/function_metadata
Change-Id: I58db212ca4876e634e1e28fca37f75f96f087c6d
Change-Id: I67524655033cfeeb86e026b4a3cacdb8b8bfd244
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Adds a builtin datasource function that exposes the runtime function registry as queryable rows: { name, arity, category, private }. Category is derived from existing engine predicates (window, aggregate, aggregate-scalar, unnest, datasource, scalar), letting clients filter instead of hardcoding function lists.
Change-Id: I58db212ca4876e634e1e28fca37f75f96f087c6d