Package org.apache.drill.exec.vector.accessor.reader

Class AbstractObjectReader

java.lang.Object
org.apache.drill.exec.vector.accessor.reader.AbstractObjectReader
All Implemented Interfaces:
ColumnReader, ObjectReader
Direct Known Subclasses:
AbstractScalarReader.ScalarObjectReader, AbstractTupleReader.TupleObjectReader, ArrayReaderImpl.ArrayObjectReader, UnionReaderImpl.UnionObjectReader
public abstract class AbstractObjectReader extends Object implements ObjectReader

  • Constructor Details

    • AbstractObjectReader

      public AbstractObjectReader()

  • Method Details

    • schema

      public ColumnMetadata schema()
      Specified by:
      schema in interface ColumnReader

    • scalar

      public ScalarReader scalar()
      Specified by:
      scalar in interface ObjectReader

    • tuple

      public TupleReader tuple()
      Specified by:
      tuple in interface ObjectReader

    • array

      public ArrayReader array()
      Specified by:
      array in interface ObjectReader

    • dict

      public DictReader dict()
      Specified by:
      dict in interface ObjectReader

    • events

      public abstract ReaderEvents events()

    • reader

      public abstract ColumnReader reader()
      Description copied from interface: ObjectReader
      Gets the reader as a generic type, for dynamic programming.
      Specified by:
      reader in interface ObjectReader
      Returns:
      the untyped reader

    • variant

      public VariantReader variant()
      Specified by:
      variant in interface ObjectReader

    • isNull

      public boolean isNull()
      Description copied from interface: ColumnReader
      Determine if this value is null.
      • Nullable scalar: determine if the value is null.
      • Non-nullable scalar: always returns false.
      • Arrays: always returns false</tt.>
      • Lists: determine if the list for the current row is null. In a list, an array entry can be null, empty, or can contain items. In repeated types, the array itself is never null. If the array is null, then it implicitly has no entries.
      • Map or Repeated Map: Always returns false.
      • Map inside a union, or in a list that contains a union, the tuple itself can be null.
      • Union: Determine if the current value is null. Null values have no type and no associated reader.
      Specified by:
      isNull in interface ColumnReader
      Returns:
      true if this value is null; false otherwise

    • type

      public ObjectType type()
      Description copied from interface: ColumnReader
      The type of this reader.
      Specified by:
      type in interface ColumnReader
      Returns:
      type of reader