Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/9658#issuecomment-157389650
@marmbrus Did you mean the metadata stored in Parquet key-value user
defined metadata, or the schema metadata in `StructField`? For primitive
JSON/BSON fields, it's a good idea to annotate them in the schema metadata. But
it doesn't cover nested fields, e.g. an array field of JSON/BSON elements.
And for "support for reading these types as strings", are you referring to
`spark.sql.parquet.binaryAsString`? Currently this option only converts
Parquet binaries without any logical type annotations, thus it doesn't cover
`binary (JSON)` or `binary (BSON)`.
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