public void contributeRuntimeOperator()

in algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/physical/ExternalGroupByPOperator.java [151:265]
107 lines of code
16 McCabe index (conditional complexity)

    public void contributeRuntimeOperator(IHyracksJobBuilder builder, JobGenContext context, ILogicalOperator op,
            IOperatorSchema opSchema, IOperatorSchema[] inputSchemas, IOperatorSchema outerPlanSchema)
                    throws AlgebricksException {
        List<LogicalVariable> gbyCols = getGbyColumns();
        int keys[] = JobGenHelper.variablesToFieldIndexes(gbyCols, inputSchemas[0]);
        GroupByOperator gby = (GroupByOperator) op;
        int numFds = gby.getDecorList().size();
        int fdColumns[] = new int[numFds];
        int j = 0;
        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> p : gby.getDecorList()) {
            ILogicalExpression expr = p.second.getValue();
            if (expr.getExpressionTag() != LogicalExpressionTag.VARIABLE) {
                throw new AlgebricksException("pre-sorted group-by expects variable references.");
            }
            VariableReferenceExpression v = (VariableReferenceExpression) expr;
            LogicalVariable decor = v.getVariableReference();
            fdColumns[j++] = inputSchemas[0].findVariable(decor);
        }

        if (gby.getNestedPlans().size() != 1) {
            throw new AlgebricksException(
                    "External group-by currently works only for one nested plan with one root containing"
                            + "an aggregate and a nested-tuple-source.");
        }
        ILogicalPlan p0 = gby.getNestedPlans().get(0);
        if (p0.getRoots().size() != 1) {
            throw new AlgebricksException(
                    "External group-by currently works only for one nested plan with one root containing"
                            + "an aggregate and a nested-tuple-source.");
        }
        Mutable<ILogicalOperator> r0 = p0.getRoots().get(0);
        AggregateOperator aggOp = (AggregateOperator) r0.getValue();

        IPartialAggregationTypeComputer partialAggregationTypeComputer = context.getPartialAggregationTypeComputer();
        List<Object> intermediateTypes = new ArrayList<Object>();
        int n = aggOp.getExpressions().size();
        ISerializedAggregateEvaluatorFactory[] aff = new ISerializedAggregateEvaluatorFactory[n];
        int i = 0;
        IExpressionRuntimeProvider expressionRuntimeProvider = context.getExpressionRuntimeProvider();
        IVariableTypeEnvironment aggOpInputEnv = context.getTypeEnvironment(aggOp.getInputs().get(0).getValue());
        IVariableTypeEnvironment outputEnv = context.getTypeEnvironment(op);
        for (Mutable<ILogicalExpression> exprRef : aggOp.getExpressions()) {
            AggregateFunctionCallExpression aggFun = (AggregateFunctionCallExpression) exprRef.getValue();
            aff[i++] = expressionRuntimeProvider.createSerializableAggregateFunctionFactory(aggFun, aggOpInputEnv,
                    inputSchemas, context);
            intermediateTypes
                    .add(partialAggregationTypeComputer.getType(aggFun, aggOpInputEnv, context.getMetadataProvider()));
        }

        int[] keyAndDecFields = new int[keys.length + fdColumns.length];
        for (i = 0; i < keys.length; ++i) {
            keyAndDecFields[i] = keys[i];
        }
        for (i = 0; i < fdColumns.length; i++) {
            keyAndDecFields[keys.length + i] = fdColumns[i];
        }

        List<LogicalVariable> keyAndDecVariables = new ArrayList<LogicalVariable>();
        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> p : gby.getGroupByList()) {
            keyAndDecVariables.add(p.first);
        }
        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> p : gby.getDecorList()) {
            keyAndDecVariables.add(GroupByOperator.getDecorVariable(p));
        }

        for (LogicalVariable var : keyAndDecVariables) {
            aggOpInputEnv.setVarType(var, outputEnv.getVarType(var));
        }

        compileSubplans(inputSchemas[0], gby, opSchema, context);
        IOperatorDescriptorRegistry spec = builder.getJobSpec();
        IBinaryComparatorFactory[] comparatorFactories = JobGenHelper.variablesToAscBinaryComparatorFactories(gbyCols,
                aggOpInputEnv, context);
        RecordDescriptor recordDescriptor = JobGenHelper.mkRecordDescriptor(context.getTypeEnvironment(op), opSchema,
                context);
        IBinaryHashFunctionFamily[] hashFunctionFactories = JobGenHelper.variablesToBinaryHashFunctionFamilies(gbyCols,
                aggOpInputEnv, context);

        ISerializedAggregateEvaluatorFactory[] merges = new ISerializedAggregateEvaluatorFactory[n];
        List<LogicalVariable> usedVars = new ArrayList<LogicalVariable>();
        IOperatorSchema[] localInputSchemas = new IOperatorSchema[1];
        localInputSchemas[0] = new OperatorSchemaImpl();
        for (i = 0; i < n; i++) {
            AggregateFunctionCallExpression aggFun = (AggregateFunctionCallExpression) aggOp.getMergeExpressions()
                    .get(i).getValue();
            aggFun.getUsedVariables(usedVars);
        }
        i = 0;
        for (Object type : intermediateTypes) {
            aggOpInputEnv.setVarType(usedVars.get(i++), type);
        }
        for (LogicalVariable keyVar : keyAndDecVariables) {
            localInputSchemas[0].addVariable(keyVar);
        }
        for (LogicalVariable usedVar : usedVars) {
            localInputSchemas[0].addVariable(usedVar);
        }
        for (i = 0; i < n; i++) {
            AggregateFunctionCallExpression mergeFun = (AggregateFunctionCallExpression) aggOp.getMergeExpressions()
                    .get(i).getValue();
            merges[i] = expressionRuntimeProvider.createSerializableAggregateFunctionFactory(mergeFun, aggOpInputEnv,
                    localInputSchemas, context);
        }
        IAggregatorDescriptorFactory aggregatorFactory = new SerializableAggregatorDescriptorFactory(aff);
        IAggregatorDescriptorFactory mergeFactory = new SerializableAggregatorDescriptorFactory(merges);

        INormalizedKeyComputerFactory normalizedKeyFactory = JobGenHelper
                .variablesToAscNormalizedKeyComputerFactory(gbyCols, aggOpInputEnv, context);
        ExternalGroupOperatorDescriptor gbyOpDesc = new ExternalGroupOperatorDescriptor(spec, tableSize, fileSize,
                keyAndDecFields, frameLimit, comparatorFactories, normalizedKeyFactory, aggregatorFactory, mergeFactory,
                recordDescriptor, recordDescriptor, new HashSpillableTableFactory(hashFunctionFactories));
        contributeOpDesc(builder, gby, gbyOpDesc);
        ILogicalOperator src = op.getInputs().get(0).getValue();
        builder.contributeGraphEdge(src, 0, op, 0);
    }