ParquetReadSupport — Non-Vectorized ReadSupport in Parquet Data Source

ParquetReadSupport is a concrete ReadSupport (from Apache Parquet) of UnsafeRows.

ParquetReadSupport is created exclusively when ParquetFileFormat is requested for a data reader (with no support for Vectorized Parquet Decoding and so falling back to parquet-mr).

ParquetReadSupport is registered as the fully-qualified class name for parquet.read.support.class Hadoop configuration when ParquetFileFormat is requested for a data reader.

ParquetReadSupport takes an optional Java TimeZone to be created.

Tip	Enable `ALL` logging level for `org.apache.spark.sql.execution.datasources.parquet.ParquetReadSupport` logger to see what happens inside. Add the following line to `conf/log4j.properties`: `log4j.logger.org.apache.spark.sql.execution.datasources.parquet.ParquetReadSupport=ALL` Refer to Logging.

Initializing ReadSupport — `init` Method

init(context: InitContext): ReadContext

Note	`init` is part of the `ReadSupport` Contract to…FIXME.

init…FIXME

`prepareForRead` Method

prepareForRead(
  conf: Configuration,
  keyValueMetaData: JMap[String, String],
  fileSchema: MessageType,
  readContext: ReadContext): RecordMaterializer[UnsafeRow]

Note	`prepareForRead` is part of the `ReadSupport` Contract to…FIXME.

prepareForRead…FIXME

ParquetReadSupport