Read Schema of parquet file about parquet4s HOT 2 OPEN

Regarding

a complete list of how to map scala types properly to fields

check the content of TypedSchemaDef

I mean... use this type class implicitly or explicitly to obtain type mapping. Check also a quite rich API of RowParquetRecord

from parquet4s.

Hi Chris!

Parquet4s doesn't expose file schema in its own API (it is a thing that could be added). However, you can easily access it by calling the original Java API that Parquet4s is using under the hood. Check org.apache.parquet.hadoop.ParquetFileReader, e.g.:

val reader = ParquetFileReader.open(inputFile, readerOptions)
try {
  val schema: MessageType = reader.getFileMetaData.getSchema
  ...
} finally reader.close()

from parquet4s.