Package org.apache.drill.exec.vector

Class UntypedNullVector

java.lang.Object
org.apache.drill.exec.vector.BaseValueVector
org.apache.drill.exec.vector.BaseDataValueVector
org.apache.drill.exec.vector.UntypedNullVector
All Implemented Interfaces:
Closeable, AutoCloseable, Iterable<ValueVector>, FixedWidthVector, ValueVector
public final class UntypedNullVector extends BaseDataValueVector implements FixedWidthVector
UntypedNullVector is to represent a value vector with TypeProtos.MinorType.NULL All values in the vector represent two semantic implications: 1) the value is unknown, 2) the type is unknown. Because of this, we only have to keep track of the number of values in value vector, and there is no allocated buffer to back up this value vector. Therefore, the majority of methods in this class is either no-op, or throws UnsupportedOperationException.

  • Field Details

    • VALUE_WIDTH

      public static final int VALUE_WIDTH
      Width of each fixed-width value.
      See Also:

  • Constructor Details

  • Method Details

    • getReader

      public FieldReader getReader()
      Description copied from interface: ValueVector
      Returns a field reader that supports reading values from this vector.
      Specified by:
      getReader in interface ValueVector

    • getBufferSizeFor

      public int getBufferSizeFor(int valueCount)
      Description copied from interface: ValueVector
      Returns the number of bytes that is used by this vector if it holds the given number of values. The result will be the same as if Mutator.setValueCount() were called, followed by calling getBufferSize(), but without any of the closing side-effects that setValueCount() implies wrt finishing off the population of a vector. Some operations might wish to use this to determine how much memory has been used by a vector so far, even though it is not finished being populated.
      Specified by:
      getBufferSizeFor in interface ValueVector
      Parameters:
      valueCount - the number of values to assume this vector contains
      Returns:
      the buffer size if this vector is holding valueCount values

    • getValueCapacity

      public int getValueCapacity()
      Description copied from interface: ValueVector
      Returns the maximum number of values that can be stored in this vector instance.
      Specified by:
      getValueCapacity in interface ValueVector

    • getAccessor

      public UntypedNullVector.Accessor getAccessor()
      Description copied from interface: ValueVector
      Returns an accessor that is used to read from this vector instance.
      Specified by:
      getAccessor in interface ValueVector

    • getMutator

      public UntypedNullVector.Mutator getMutator()
      Description copied from interface: ValueVector
      Returns an mutator that is used to write to this vector instance.
      Specified by:
      getMutator in interface ValueVector

    • setInitialCapacity

      public void setInitialCapacity(int valueCount)
      Description copied from interface: ValueVector
      Set the initial record capacity
      Specified by:
      setInitialCapacity in interface ValueVector
      Parameters:
      valueCount -

    • allocateNew

      public void allocateNew()
      Description copied from interface: ValueVector
      Allocate new buffers. ValueVector implements logic to determine how much to allocate.
      Specified by:
      allocateNew in interface ValueVector

    • allocateNewSafe

      public boolean allocateNewSafe()
      Description copied from interface: ValueVector
      Allocates new buffers. ValueVector implements logic to determine how much to allocate.
      Specified by:
      allocateNewSafe in interface ValueVector
      Returns:
      Returns true if allocation was successful.

    • allocateNew

      public void allocateNew(int valueCount)
      Description copied from interface: FixedWidthVector
      Allocate a new memory space for this vector. Must be called prior to using the ValueVector.
      Specified by:
      allocateNew in interface FixedWidthVector
      Parameters:
      valueCount - Number of values in the vector.

    • reset

      public void reset()
      Description copied from class: BaseDataValueVector
      This method has a similar effect of allocateNew() without actually clearing and reallocating the value vector. The purpose is to move the value vector to a "mutate" state
      Overrides:
      reset in class BaseDataValueVector

    • zeroVector

      public void zeroVector()
      Zero out the underlying buffer backing this vector.
      Specified by:
      zeroVector in interface FixedWidthVector

    • reallocRaw

      public DrillBuf reallocRaw(int newAllocationSize)
      Description copied from class: BaseDataValueVector
      Core of vector allocation. Given a new size (which must be a power of two), allocate the new buffer, copy the current values, and leave the unused parts garbage-filled.
      Specified by:
      reallocRaw in class BaseDataValueVector
      Parameters:
      newAllocationSize - new buffer size as a power of two
      Returns:
      the new buffer

    • getValueWidth

      public int getValueWidth()
      Description copied from interface: FixedWidthVector
      The width of a record in bytes.
      Specified by:
      getValueWidth in interface FixedWidthVector
      Returns:
      The width of a record in bytes.

    • load

      public void load(UserBitShared.SerializedField metadata, DrillBuf buffer)
      Description copied from interface: ValueVector
      Load the data provided in the buffer. Typically used when deserializing from the wire.
      Specified by:
      load in interface ValueVector
      Parameters:
      metadata - Metadata used to decode the incoming buffer.
      buffer - The buffer that contains the ValueVector.

    • getTransferPair

      public TransferPair getTransferPair(BufferAllocator allocator)
      Description copied from interface: ValueVector
      Returns a transfer pair, creating a new target vector of the same type.
      Specified by:
      getTransferPair in interface ValueVector
      Overrides:
      getTransferPair in class BaseValueVector

    • getTransferPair

      public TransferPair getTransferPair(String ref, BufferAllocator allocator)
      Specified by:
      getTransferPair in interface ValueVector

    • makeTransferPair

      public TransferPair makeTransferPair(ValueVector to)
      Description copied from interface: ValueVector
      Returns a new transfer pair that is used to transfer underlying buffers into the target vector.
      Specified by:
      makeTransferPair in interface ValueVector

    • transferTo

      public void transferTo(UntypedNullVector target)

    • splitAndTransferTo

      public void splitAndTransferTo(int startIndex, int length, UntypedNullVector target)

    • getPayloadByteCount

      public int getPayloadByteCount(int valueCount)
      Description copied from interface: ValueVector
      Return the number of value bytes consumed by actual data.
      Specified by:
      getPayloadByteCount in interface ValueVector

    • copyFrom

      public void copyFrom(int fromIndex, int thisIndex, UntypedNullVector from)

    • copyFromSafe

      public void copyFromSafe(int fromIndex, int thisIndex, UntypedNullVector from)

    • copyEntry

      public void copyEntry(int toIndex, ValueVector from, int fromIndex)
      Specified by:
      copyEntry in interface ValueVector

    • clear

      public void clear()
      Description copied from interface: ValueVector
      Release the underlying DrillBuf and reset the ValueVector to empty.
      Specified by:
      clear in interface ValueVector
      Overrides:
      clear in class BaseDataValueVector