Package org.apache.beam.sdk.io.parquet

Class ParquetIO.Read

java.lang.Object
org.apache.beam.sdk.transforms.PTransform<PBegin,PCollection<GenericRecord>>
org.apache.beam.sdk.io.parquet.ParquetIO.Read
All Implemented Interfaces:
Serializable, HasDisplayData
Enclosing class:
ParquetIO
public abstract static class ParquetIO.Read extends PTransform<PBegin,PCollection<GenericRecord>>
Implementation of ParquetIO.read(Schema).
See Also:

  • Constructor Details

    • Read

      public Read()

  • Method Details

    • from

      public ParquetIO.Read from(ValueProvider<String> filepattern)
      Reads from the given filename or filepattern.

    • from

      public ParquetIO.Read from(String filepattern)
      Like from(ValueProvider).

    • withProjection

      public ParquetIO.Read withProjection(Schema projectionSchema, Schema encoderSchema)
      Enable the reading with projection.

    • withConfiguration

      public ParquetIO.Read withConfiguration(Map<String,String> configuration)
      Specify Hadoop configuration for ParquetReader.

    • withConfiguration

      public ParquetIO.Read withConfiguration(org.apache.hadoop.conf.Configuration configuration)
      Specify Hadoop configuration for ParquetReader.

    • withBeamSchemas

      public ParquetIO.Read withBeamSchemas(boolean inferBeamSchema)

    • withAvroDataModel

      public ParquetIO.Read withAvroDataModel(GenericData model)
      Define the Avro data model; see AvroParquetReader.Builder.withDataModel(GenericData).

    • expand

      public PCollection<GenericRecord> expand(PBegin input)
      Description copied from class: PTransform
      Override this method to specify how this PTransform should be expanded on the given InputT.

      NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

      Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

      Specified by:
      expand in class PTransform<PBegin,PCollection<GenericRecord>>

    • populateDisplayData

      public void populateDisplayData(DisplayData.Builder builder)
      Description copied from class: PTransform
      Register display data for the given transform or component.

      populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

      By default, does not register any display data. Implementors may override this method to provide their own display data.

      Specified by:
      populateDisplayData in interface HasDisplayData
      Overrides:
      populateDisplayData in class PTransform<PBegin,PCollection<GenericRecord>>
      Parameters:
      builder - The builder to populate with display data.
      See Also: