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

Class BitColumnWriter

java.lang.Object
org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriter
org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriterImpl
org.apache.drill.exec.vector.accessor.writer.BaseScalarWriter
org.apache.drill.exec.vector.accessor.writer.AbstractFixedWidthWriter
org.apache.drill.exec.vector.accessor.writer.BitColumnWriter
All Implemented Interfaces:
ColumnWriter, ScalarWriter, ValueWriter, WriterEvents, WriterPosition
public class BitColumnWriter extends AbstractFixedWidthWriter
Specialized writer for bit columns. Bits are packed 8 per byte. Rather than duplicate that logic here, this writer just delegates to the vector's own mutator.

  • Constructor Details

    • BitColumnWriter

      public BitColumnWriter(ValueVector vector)

  • Method Details

    • vector

      public BaseDataValueVector vector()
      Specified by:
      vector in class AbstractScalarWriterImpl

    • width

      public int width()
      Specified by:
      width in class AbstractFixedWidthWriter

    • valueType

      public ValueType valueType()
      Description copied from interface: ScalarWriter
      Describe the type of the value. This is a compression of the value vector type: it describes which method will return the vector value.
      Returns:
      the value type which indicates which get method is valid for the column

    • prepareWrite

      protected int prepareWrite()

    • setValueCount

      public void setValueCount(int valueCount)
      Overrides:
      setValueCount in class AbstractFixedWidthWriter

    • fillEmpties

      protected final void fillEmpties(int writeIndex)
      Fill empties. This is required because the allocated memory is not zero-filled.
      Specified by:
      fillEmpties in class AbstractFixedWidthWriter

    • setBoolean

      public final void setBoolean(boolean value)
      Specified by:
      setBoolean in interface ValueWriter
      Overrides:
      setBoolean in class BaseScalarWriter

    • setInt

      public void setInt(int value)
      Specified by:
      setInt in interface ValueWriter
      Overrides:
      setInt in class BaseScalarWriter

    • setValue

      public void setValue(Object value)
      Description copied from interface: ValueWriter
      Write value to a vector as a Java object of the "native" type for the column. This form is available only on scalar writers. The object must be of the form for the primary write method above.

      Primarily to be used when the code already knows the object type.

      Parameters:
      value - a value that matches the primary setter above, or null to set the column to null
      See Also:

    • setDefaultValue

      public final void setDefaultValue(Object value)
      Description copied from interface: ScalarWriter
      Set the default value to be used to fill empties for this writer. Only valid for required writers: null writers set this is-set bit to 0 and set the data value to 0.
      Parameters:
      value - the value to set. Cannot be null. The type of the value must match that legal for ValueWriter.setValue(Object)

    • copy

      public void copy(ColumnReader from)
      Description copied from interface: ColumnWriter
      Copy a single value from the given reader, which must be of the same type as this writer.
      Parameters:
      from - reader to provide the data