net.sf.farrago.fennel.calc
Class CalcRexImplementorTableImpl.HistogramResultRexImplementor

java.lang.Object
  net.sf.farrago.fennel.calc.CalcRexImplementorTableImpl.AbstractCalcRexImplementor
      net.sf.farrago.fennel.calc.CalcRexImplementorTableImpl.HistogramResultRexImplementor

All Implemented Interfaces:

CalcRexImplementor

Enclosing class:

CalcRexImplementorTableImpl

private static class CalcRexImplementorTableImpl.HistogramResultRexImplementor
extends CalcRexImplementorTableImpl.AbstractCalcRexImplementor

Implementation of the operators which extract a result from a histogram:

• $HISTOGRAM_MIN,
• $HISTOGRAM_MAX,
• $HISTOGRAM_FIRST_VALUE,
• $HISTOGRAM_LAST_VALUE

See Also:

CalcRexImplementorTableImpl.HistogramAggRexImplementor

Field Summary

private SqlAggFunction

function

Constructor Summary

CalcRexImplementorTableImpl.HistogramResultRexImplementor(SqlAggFunction function)

Method Summary

CalcReg

implement(RexCall call, RexToCalcTranslator translator) Generates instructions to implement this call, and returns the register which holds the result.

Methods inherited from class net.sf.farrago.fennel.calc.CalcRexImplementorTableImpl.AbstractCalcRexImplementor

canImplement

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

function

private final SqlAggFunction function

Constructor Detail

CalcRexImplementorTableImpl.HistogramResultRexImplementor

public CalcRexImplementorTableImpl.HistogramResultRexImplementor(SqlAggFunction function)

Method Detail

implement

public CalcReg implement(RexCall call,
                         RexToCalcTranslator translator)

Description copied from interface: CalcRexImplementor

Generates instructions to implement this call, and returns the register which holds the result.