test: cover write, evolve and read back of a defaulted column end to end - #874
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Writes a data file, adds a column with an
initial-defaultviaUpdateSchema, then reads the pre-evolution file back with the evolved schema and checks the old rows materialize the default.Parametrized over both formats (Parquet, Avro) and over
long/string/boolean/date/decimal(9,2)/timestamp/uuid— 14 cases. The read-path tests build the projected schema by hand and the evolution tests never touch a data file, so the seam between the two was uncovered; per-type coverage only existed at theToArrowScalarunit layer, not through a real write and read (uuidin particular goes through thearrow.uuidextension type).data_testpasses (169). Verified the assertions bite by feeding wrong expected values.