Package org.apache.druid.query.aggregation.last

Class DoubleLastBufferAggregator

    • Method Detail

      • get

        public Object get​(ByteBuffer buf,
                  int position)
        Description copied from interface: BufferAggregator
        Returns the intermediate object representation of the given aggregate. Converts the given byte buffer representation into an intermediate aggregate Object Implementations must not change the position, limit or mark of the given buffer. The object returned must not have any references to the given buffer (i.e., make a copy), since the underlying buffer is a shared resource and may be given to another processing thread while the objects returned by this aggregator are still in use. If the corresponding AggregatorFactory.combine(Object, Object) method for this aggregator expects its inputs to be mutable, then the object returned by this method must be mutable.
        Parameters:
        buf - byte buffer storing the byte array representation of the aggregate
        position - offset within the byte buffer at which the aggregate value is stored
        Returns:
        the Object representation of the aggregate

      • getFloat

        public float getFloat​(ByteBuffer buf,
                      int position)
        Description copied from interface: BufferAggregator
        Returns the float representation of the given aggregate byte array Converts the given byte buffer representation into the intermediate aggregate value. Implementations must not change the position, limit or mark of the given buffer Implementations are only required to support this method if they are aggregations which have an AggregatorFactory.getIntermediateType() ()} of ValueType.FLOAT. If unimplemented, throwing an UnsupportedOperationException is common and recommended.
        Parameters:
        buf - byte buffer storing the byte array representation of the aggregate
        position - offset within the byte buffer at which the aggregate value is stored
        Returns:
        the float representation of the aggregate

      • getLong

        public long getLong​(ByteBuffer buf,
                    int position)
        Description copied from interface: BufferAggregator
        Returns the long representation of the given aggregate byte array Converts the given byte buffer representation into the intermediate aggregate value. Implementations must not change the position, limit or mark of the given buffer Implementations are only required to support this method if they are aggregations which have an AggregatorFactory.getIntermediateType() of of ValueType.LONG. If unimplemented, throwing an UnsupportedOperationException is common and recommended.
        Parameters:
        buf - byte buffer storing the byte array representation of the aggregate
        position - offset within the byte buffer at which the aggregate value is stored
        Returns:
        the long representation of the aggregate

      • getDouble

        public double getDouble​(ByteBuffer buf,
                        int position)
        Description copied from interface: BufferAggregator
        Returns the double representation of the given aggregate byte array Converts the given byte buffer representation into the intermediate aggregate value. Implementations must not change the position, limit or mark of the given buffer Implementations are only required to support this method if they are aggregations which have an AggregatorFactory.getIntermediateType() of of ValueType.DOUBLE. If unimplemented, throwing an UnsupportedOperationException is common and recommended. The default implementation casts BufferAggregator.getFloat(ByteBuffer, int) to double. This default method is added to enable smooth backward compatibility, please re-implement it if your aggregators work with numeric double columns.
        Parameters:
        buf - byte buffer storing the byte array representation of the aggregate
        position - offset within the byte buffer at which the aggregate value is stored
        Returns:
        the double representation of the aggregate