Class UnionSketchUDAF

  • All Implemented Interfaces:
    org.apache.hadoop.hive.ql.udf.generic.GenericUDAFResolver, org.apache.hadoop.hive.ql.udf.generic.GenericUDAFResolver2
    Direct Known Subclasses:
    UnionDoubleSummarySketchUDAF, UnionDoubleSummaryWithModeSketchUDAF

    public abstract class UnionSketchUDAF
    extends org.apache.hadoop.hive.ql.udf.generic.AbstractGenericUDAFResolver
    Generic implementation to be sub-classed with a particular type of Summary
    • Constructor Detail

      • UnionSketchUDAF

        public UnionSketchUDAF()
    • Method Detail

      • getEvaluator

        public org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator getEvaluator​(org.apache.hadoop.hive.ql.udf.generic.GenericUDAFParameterInfo info)
                                                                                throws org.apache.hadoop.hive.ql.parse.SemanticException
        Specified by:
        getEvaluator in interface org.apache.hadoop.hive.ql.udf.generic.GenericUDAFResolver2
        Overrides:
        getEvaluator in class org.apache.hadoop.hive.ql.udf.generic.AbstractGenericUDAFResolver
        Throws:
        org.apache.hadoop.hive.ql.parse.SemanticException
      • checkExtraArguments

        protected void checkExtraArguments​(org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector[] inspectors)
                                    throws org.apache.hadoop.hive.ql.parse.SemanticException
        Override this if your UDF has more arguments
        Parameters:
        inspectors - array of inspectors
        Throws:
        org.apache.hadoop.hive.ql.parse.SemanticException - if anything is wrong
      • createEvaluator

        public abstract org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator createEvaluator()
        This is needed because a concrete UDAF is going to have its own concrete evaluator static inner class.
        Returns:
        an instance of evaluator