Method DsKllStringify

be/src/exprs/datasketches-functions-ir.cc:337–351

}

StringVal DataSketchesFunctions::DsKllStringify( FunctionContext* ctx,
    const StringVal& serialized_sketch) {
  if (serialized_sketch.is_null || serialized_sketch.len == 0) return StringVal::null();
  try {
    auto sketch = datasketches::kll_sketch<float>::deserialize(serialized_sketch.ptr,
        serialized_sketch.len);
    string str = sketch.to_string(false, false);
    StringVal dst(ctx, str.size());
    memcpy(dst.ptr, str.c_str(), str.size());
    return dst;
  } catch (const std::exception& e) {
    LogSketchDeserializationError(ctx, e);
    return StringVal::null();
  }
}

}