Spark 3.3: Re-Enable TwoLevel Parquet List UT#5179
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Co-authored-by: Prashant Singh <psinghvk@amazon.com>
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Co-authored-by: Prashant Singh <psinghvk@amazon.com>
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About the changes
Address #5094 (comment)
Spark was writing 3 level list rather than 2 level list which was expected in the UT.
On debugging this more found that, since the schema was passed via
spark.read().schema(sparkSchema).jsonand as of spark 3.3 spark will not respect the nullability in the schema passed via above by default (ref. this).Now since the nullability is not respected (will be considered nullable) by spark by default the Parquet writer despite
writeLegacyParquetFormatbeing true, will write in Three level list. CodePointerThis pr adds the conf to respect the nullability provided presently and hence preserves the existing behaviour.
P.S : A good long term fix would be to get rid of this form of specifying schema from our test / test utils, can pick this in a follow-up.
Testing Done
Re-enabled the UT, which was ignored in version upgrade.
cc @rdblue