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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