Problem decoding Maps with union values

[cowtowncoder]

(reported by a user)

Looks like Avro codec (version 2.7.8) writes nested Maps correctly, but has some issues with decoding, such that entries (of the outermost Map) after first one are dropped. That is, only the first key/value pair seems to be exposed.

[cowtowncoder]

FWTW this seems to be less due to Map handling, and more with reading of Unions (with scalar member(s)?). Looks like state is not properly managed. Got a test case, hope to resolve soon.