We are actively working on supporting extension types. The mechanism is likely to be using the Arrow extension type mechanism (a logical annotation on top of ex

We are actively working on supporting extension types. The mechanism is likely to be using the Arrow extension type mechanism (a logical annotation on top of existing Arrow types https://arrow.apache.org/docs/format/Columnar.html#format-metadata-extension-types https://arrow.apache.org/docs/format/Columnar.html#format-me...) I expect this to be used to support Variant https://github.com/apache/datafusion/issues/16116 https://github.com/apache/datafusion/issues/16116 and geometry types (note I am an author)