Hi I'm confused by NullVector::getField. It is a FieldVector so, according to the javadoc, should be "A vector corresponding to a Field in the schema." However, getField unconditionally returns a new field - with the name "$data$" (which is clearly intentional: https://github.com/apache/arrow/pull/1193). It does not return the field in the schema that was used to create the vector. (there is some indication in that PR that NullVector/ZeroVector is only ever supposed to be an inner vector?) I have noticed this because for some types, pyarrow serialises fields of an empty data table to null-type Arrow fields (https://github.com/apache/arrow/issues/2110). When deserializing in Java, the original schema field names are not contained in the names of VectorSchemaRoot::getFieldVectors (and instead the "$data$" names are exposed).
Is this a bug? Best Matt (p.s. I emailed u...@arrow.apache.org <mailto:u...@arrow.apache.org> using the web GUI but it still hasn’t shown up, so am trying this instead)
