Datum pg_hll_sketch_serialize_state()

in src/hll_sketch_pg_functions.c [285:317]

• 27 lines of code
• 5 McCabe index (conditional complexity)

Datum pg_hll_sketch_serialize_state(PG_FUNCTION_ARGS) {
  struct hll_agg_state* stateptr;
  struct ptr_with_size bytes_out;

  MemoryContext oldcontext;
  MemoryContext aggcontext;

  if (PG_ARGISNULL(0)) PG_RETURN_NULL();

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

  stateptr = (struct hll_agg_state*) PG_GETARG_POINTER(0);
  if (stateptr->type == UNION) {
    if (stateptr->tgt_type) {
      stateptr->ptr = hll_union_get_result_tgt_type(stateptr->ptr, stateptr->tgt_type);
    } else {
      stateptr->ptr = hll_union_get_result(stateptr->ptr);
    }
  }
  bytes_out = hll_sketch_serialize(stateptr->ptr, VARHDRSZ + 2);
  ((char*)bytes_out.ptr)[VARHDRSZ] = stateptr->lg_k;
  ((char*)bytes_out.ptr)[VARHDRSZ + 1] = stateptr->tgt_type;
  hll_sketch_delete(stateptr->ptr);
  pfree(stateptr);
  SET_VARSIZE(bytes_out.ptr, bytes_out.size);

  MemoryContextSwitchTo(oldcontext);

  PG_RETURN_BYTEA_P(bytes_out.ptr);
}