Note

Switches reducer factory registration from dynamic runtime registration to a fixed static registry and updates lookup accordingly.

• Aggregate/Reducer:
  • Implement a static builtin registry in src/aggregate/reducer.c with fixed entries (e.g., COUNT, SUM, MIN, MAX, AVG, COUNT_DISTINCT, QUANTILE, STDDEV, FIRST_VALUE, RANDOM_SAMPLE, HLL, HLL_SUM) guarded by REGISTRY_SIZE and static_assert.
  • Simplify RDCR_GetFactory to iterate the fixed array; remove dynamic array usage.
  • Remove runtime registration flow: delete RDCR_RegisterFactory, RDCR_RegisterBuiltins, and associated macros; drop their declarations from src/aggregate/reducer.h.

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