Datum pg_kll_float_sketch_combine()

in src/kll_float_sketch_pg_functions.c [170:201]

• 25 lines of code
• 6 McCabe index (conditional complexity)

Datum pg_kll_float_sketch_combine(PG_FUNCTION_ARGS) {
  void* sketchptr1;
  void* sketchptr2;
  void* sketchptr;

  MemoryContext oldcontext;
  MemoryContext aggcontext;

  if (PG_ARGISNULL(0) && PG_ARGISNULL(1)) PG_RETURN_NULL();

  if (!AggCheckCallContext(fcinfo, &aggcontext)) {
    elog(ERROR, "kll_float_sketch_combine called in non-aggregate context");
  }
  oldcontext = MemoryContextSwitchTo(aggcontext);

  sketchptr1 = PG_GETARG_POINTER(0);
  sketchptr2 = PG_GETARG_POINTER(1);

  if (sketchptr1) {
    sketchptr = sketchptr1;
    if (sketchptr2) {
      kll_float_sketch_merge(sketchptr, sketchptr2);
    }
    kll_float_sketch_delete(sketchptr2);
  } else {
    sketchptr = sketchptr2;
  }

  MemoryContextSwitchTo(oldcontext);

  PG_RETURN_POINTER(sketchptr);
}