Package org.apache.drill.exec.vector

Class VarCharVector

java.lang.Object
org.apache.drill.exec.vector.BaseValueVector
org.apache.drill.exec.vector.BaseDataValueVector
org.apache.drill.exec.vector.VarCharVector
All Implemented Interfaces:
Closeable, AutoCloseable, Iterable<ValueVector>, ValueVector, VariableWidthVector
public final class VarCharVector extends BaseDataValueVector implements VariableWidthVector
VarCharVector implements a vector of variable width values. Elements in the vector are accessed by position from the logical start of the vector. A fixed width offsetVector is used to convert an element's position to it's offset from the start of the (0-based) DrillBuf. Size is inferred from adjacent elements.
  • The width of each element is 4 byte(s). Note that the actual width is variable, this width is used as a guess for certain calculations.
  • The equivalent Java primitive is 'int'
NB: this class is automatically generated from VariableLengthVectors.java and ValueVectorTypes.tdd using FreeMarker.

  • 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

    • getBufferSize

      public int getBufferSize()
      Description copied from interface: ValueVector
      Returns the number of bytes that is used by this vector instance. This is a bit of a misnomer. Returns the number of bytes used by data in this instance.
      Specified by:
      getBufferSize in interface ValueVector
      Overrides:
      getBufferSize in class BaseDataValueVector

    • getAllocatedSize

      public int getAllocatedSize()
      Description copied from interface: ValueVector
      Returns the total size of buffers allocated by this vector. Has meaning only when vectors are directly allocated and each vector has its own buffer. Does not have meaning for vectors deserialized from the network or disk in which multiple vectors share the same vector.
      Specified by:
      getAllocatedSize in interface ValueVector
      Overrides:
      getAllocatedSize in class BaseDataValueVector
      Returns:
      allocated buffer size, in bytes

    • 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

    • getByteCapacity

      public int getByteCapacity()
      Description copied from interface: VariableWidthVector
      Provide the maximum amount of variable width bytes that can be stored int his vector.
      Specified by:
      getByteCapacity in interface VariableWidthVector
      Returns:

    • getCurrentSizeInBytes

      public int getCurrentSizeInBytes()
      Return the number of bytes contained in the current var len byte vector. TODO: Remove getVarByteLength with it's implementation after all client's are moved to using getCurrentSizeInBytes. It's kept as is to preserve backward compatibility
      Specified by:
      getCurrentSizeInBytes in interface VariableWidthVector
      Returns:

    • getVarByteLength

      public int getVarByteLength()
      Return the number of bytes contained in the current var len byte vector.
      Returns:

    • getMetadata

      public UserBitShared.SerializedField getMetadata()
      Description copied from interface: ValueVector
      Get the metadata for this field. Used in serialization
      Specified by:
      getMetadata in interface ValueVector
      Overrides:
      getMetadata in class BaseValueVector
      Returns:
      FieldMetadata for this field.

    • 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.

    • 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

    • getBuffers

      public DrillBuf[] getBuffers(boolean clear)
      Description copied from interface: ValueVector
      Return the underlying buffers associated with this vector. Note that this doesn't impact the reference counts for this buffer so it only should be used for in-context access. Also note that this buffer changes regularly thus external classes shouldn't hold a reference to it (unless they change it).
      Specified by:
      getBuffers in interface ValueVector
      Overrides:
      getBuffers in class BaseDataValueVector
      Parameters:
      clear - Whether to clear vector before returning; the buffers will still be refcounted; but the returned array will be the only reference to them
      Returns:
      The underlying buffers that is used by this vector instance.

    • getOffsetAddr

      public long getOffsetAddr()

    • getOffsetVector

      public UInt4Vector getOffsetVector()
      Specified by:
      getOffsetVector in interface VariableWidthVector

    • 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(VarCharVector target)

    • splitAndTransferTo

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

    • copyFrom

      protected void copyFrom(int fromIndex, int thisIndex, VarCharVector from)

    • copyFromSafe

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

    • copyEntry

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

    • collectLedgers

      public void collectLedgers(Set<AllocationManager.BufferLedger> ledgers)
      Description copied from interface: ValueVector
      Add the ledgers underlying the buffers underlying the components of the vector to the set provided. Used to determine actual memory allocation.
      Specified by:
      collectLedgers in interface ValueVector
      Overrides:
      collectLedgers in class BaseDataValueVector
      Parameters:
      ledgers - set of ledgers to which to add ledgers for this vector

    • 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

    • setInitialCapacity

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

    • 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 totalBytes, int valueCount)
      Description copied from interface: VariableWidthVector
      Allocate a new memory space for this vector. Must be called prior to using the ValueVector.
      Specified by:
      allocateNew in interface VariableWidthVector
      Parameters:
      totalBytes - Desired size of the underlying data buffer.
      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

    • reAlloc

      public void reAlloc()

    • 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

    • decrementAllocationMonitor

      public void decrementAllocationMonitor()

    • getAccessor

      public VarCharVector.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
      Specified by:
      getAccessor in interface VariableWidthVector

    • getMutator

      public VarCharVector.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
      Specified by:
      getMutator in interface VariableWidthVector

    • exchange

      public void exchange(ValueVector other)
      Description copied from interface: ValueVector
      Exchange state with another value vector of the same type. Used to implement look-ahead writers.
      Specified by:
      exchange in interface ValueVector
      Overrides:
      exchange in class BaseDataValueVector

    • toNullable

      public void toNullable(ValueVector nullableVector)
      Description copied from interface: ValueVector
      Convert a non-nullable vector to nullable by shuffling the data from one to the other. Avoids the need to generate copy code just to change mode. If this vector is non-nullable, accepts a nullable dual (same minor type, different mode.) If the vector is non-nullable, or non-scalar, then throws an exception.
      Specified by:
      toNullable in interface ValueVector
      Overrides:
      toNullable in class BaseValueVector
      Parameters:
      nullableVector - nullable vector of the same minor type as this vector