Examples with CombineToGroupCombineWrapper org.apache.flink.api.java.operators.translation.CombineToGroupCombineWrapper used on opensource projects

Example 1 with CombineToGroupCombineWrapper

use of org.apache.flink.api.java.operators.translation.CombineToGroupCombineWrapper in project flink by apache.

the class GroupReduceOperator method translateToDataFlow.

// --------------------------------------------------------------------------------------------
// Translation
// --------------------------------------------------------------------------------------------
@Override
@SuppressWarnings("unchecked")
protected GroupReduceOperatorBase<?, OUT, ?> translateToDataFlow(Operator<IN> input) {
    String name = getName() != null ? getName() : "GroupReduce at " + defaultName;
    // wrap CombineFunction in GroupCombineFunction if combinable
    if (combinable && function instanceof CombineFunction<?, ?>) {
        this.function = function instanceof RichGroupReduceFunction<?, ?> ? new RichCombineToGroupCombineWrapper((RichGroupReduceFunction<?, ?>) function) : new CombineToGroupCombineWrapper((CombineFunction<?, ?>) function);
    }
    // distinguish between grouped reduce and non-grouped reduce
    if (grouper == null) {
        // non grouped reduce
        UnaryOperatorInformation<IN, OUT> operatorInfo = new UnaryOperatorInformation<>(getInputType(), getResultType());
        GroupReduceOperatorBase<IN, OUT, GroupReduceFunction<IN, OUT>> po = new GroupReduceOperatorBase<>(function, operatorInfo, new int[0], name);
        po.setCombinable(combinable);
        po.setInput(input);
        // the parallelism for a non grouped reduce can only be 1
        po.setParallelism(1);
        return po;
    }
    if (grouper.getKeys() instanceof SelectorFunctionKeys) {
        @SuppressWarnings("unchecked") SelectorFunctionKeys<IN, ?> selectorKeys = (SelectorFunctionKeys<IN, ?>) grouper.getKeys();
        if (grouper instanceof SortedGrouping) {
            SortedGrouping<IN> sortedGrouping = (SortedGrouping<IN>) grouper;
            SelectorFunctionKeys<IN, ?> sortKeys = sortedGrouping.getSortSelectionFunctionKey();
            Ordering groupOrder = sortedGrouping.getGroupOrdering();
            PlanUnwrappingSortedReduceGroupOperator<IN, OUT, ?, ?> po = translateSelectorFunctionSortedReducer(selectorKeys, sortKeys, groupOrder, function, getResultType(), name, input, isCombinable());
            po.setParallelism(this.getParallelism());
            po.setCustomPartitioner(grouper.getCustomPartitioner());
            return po;
        } else {
            PlanUnwrappingReduceGroupOperator<IN, OUT, ?> po = translateSelectorFunctionReducer(selectorKeys, function, getResultType(), name, input, isCombinable());
            po.setParallelism(this.getParallelism());
            po.setCustomPartitioner(grouper.getCustomPartitioner());
            return po;
        }
    } else if (grouper.getKeys() instanceof ExpressionKeys) {
        int[] logicalKeyPositions = grouper.getKeys().computeLogicalKeyPositions();
        UnaryOperatorInformation<IN, OUT> operatorInfo = new UnaryOperatorInformation<>(getInputType(), getResultType());
        GroupReduceOperatorBase<IN, OUT, GroupReduceFunction<IN, OUT>> po = new GroupReduceOperatorBase<>(function, operatorInfo, logicalKeyPositions, name);
        po.setCombinable(combinable);
        po.setInput(input);
        po.setParallelism(getParallelism());
        po.setCustomPartitioner(grouper.getCustomPartitioner());
        // set group order
        if (grouper instanceof SortedGrouping) {
            SortedGrouping<IN> sortedGrouper = (SortedGrouping<IN>) grouper;
            int[] sortKeyPositions = sortedGrouper.getGroupSortKeyPositions();
            Order[] sortOrders = sortedGrouper.getGroupSortOrders();
            Ordering o = new Ordering();
            for (int i = 0; i < sortKeyPositions.length; i++) {
                o.appendOrdering(sortKeyPositions[i], null, sortOrders[i]);
            }
            po.setGroupOrder(o);
        }
        return po;
    } else {
        throw new UnsupportedOperationException("Unrecognized key type.");
    }
}