Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/8988#issuecomment-145951488
Fixed a bug related to UDT: an exception is thrown when reading Parquet
files containing UDT values under standard mode. Regression tests are added in
[`UserDefinedTypeSuite`] [1].
In 1.5 and earlier versions, when reading Parquet files containing UDT
values, we pass schema containing UDT to `CatalystRowConverter` and translate
UDTs into corresponding Parquet types there to create value converters. The
problem is that, `CatalystRowConverter` isn't aware of standard/legacy mode,
and always generate a Parquet type in legacy format. The last commit fixes this
issue by expanding UDTs early in `CatalystRowMaterializer`, so that
`CatalystRowConverter` doesn't need to worry about UDTs anymore.
[1]:
https://github.com/liancheng/spark/commit/d395bfd0bb73a7522e807e43f80e4307a65001a2#diff-5404bf307e20b3603a661e29a8a9f8fc
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