Examples with ValueHolder org.apache.drill.exec.expr.holders.ValueHolder used on opensource projects

Example 6 with ValueHolder

use of org.apache.drill.exec.expr.holders.ValueHolder in project drill by apache.

the class FunctionConverter method getHolder.

public <T extends DrillFunc> DrillFuncHolder getHolder(AnnotatedClassDescriptor func, ClassLoader classLoader) {
    FunctionTemplate template = func.getAnnotationProxy(FunctionTemplate.class);
    if (template == null) {
        return failure("Class does not declare FunctionTemplate annotation.", func);
    }
    String name = template.name();
    List<String> names = Arrays.asList(template.names());
    if (name.isEmpty() && names.isEmpty()) {
        // none set
        return failure("Must define 'name' or 'names'", func);
    }
    if (!name.isEmpty() && !names.isEmpty()) {
        // both are set
        return failure("Must use only one annotations 'name' or 'names', not both", func);
    }
    // start by getting field information.
    List<ValueReference> params = Lists.newArrayList();
    List<WorkspaceReference> workspaceFields = Lists.newArrayList();
    ValueReference outputField = null;
    for (FieldDescriptor field : func.getFields()) {
        Param param = field.getAnnotationProxy(Param.class);
        Output output = field.getAnnotationProxy(Output.class);
        Workspace workspace = field.getAnnotationProxy(Workspace.class);
        Inject inject = field.getAnnotationProxy(Inject.class);
        Annotation[] annotations = { param, output, workspace, inject };
        int annotationCount = 0;
        for (Annotation annotationDescriptor : annotations) {
            if (annotationDescriptor != null) {
                annotationCount += 1;
            }
        }
        if (annotationCount == 0) {
            return failure("The field must be either a @Param, @Output, @Inject or @Workspace field.", func, field);
        } else if (annotationCount > 1) {
            return failure("The field must be only one of @Param, @Output, @Inject or @Workspace. It currently has more than one of these annotations.", func, field);
        }
        // TODO(Julien): verify there are a few of those and we can load them
        Class<?> fieldClass = field.getFieldClass();
        if (param != null || output != null) {
            // Special processing for @Param FieldReader
            if (param != null && FieldReader.class.isAssignableFrom(fieldClass)) {
                params.add(ValueReference.createFieldReaderRef(field.getName()));
                continue;
            }
            // Special processing for @Output ComplexWriter
            if (output != null && ComplexWriter.class.isAssignableFrom(fieldClass)) {
                if (outputField != null) {
                    return failure("You've declared more than one @Output field.  You must declare one and only @Output field per Function class.", func, field);
                } else {
                    outputField = ValueReference.createComplexWriterRef(field.getName());
                }
                continue;
            }
            // check that param and output are value holders.
            if (!ValueHolder.class.isAssignableFrom(fieldClass)) {
                return failure(String.format("The field doesn't holds value of type %s which does not implement the ValueHolder interface.  All fields of type @Param or @Output must extend this interface..", fieldClass), func, field);
            }
            // get the type field from the value holder.
            MajorType type = null;
            try {
                type = getStaticFieldValue("TYPE", fieldClass, MajorType.class);
            } catch (Exception e) {
                return failure("Failure while trying to access the ValueHolder's TYPE static variable.  All ValueHolders must contain a static TYPE variable that defines their MajorType.", e, func, field);
            }
            ValueReference p = new ValueReference(type, field.getName());
            if (param != null) {
                p.setConstant(param.constant());
                params.add(p);
            } else {
                if (outputField != null) {
                    return failure("You've declared more than one @Output field.  You must declare one and only @Output field per Function class.", func, field);
                } else {
                    outputField = p;
                }
            }
        } else {
            // workspace work.
            boolean isInject = inject != null;
            if (isInject && UdfUtilities.INJECTABLE_GETTER_METHODS.get(fieldClass) == null) {
                return failure(String.format("A %s cannot be injected into a %s," + " available injectable classes are: %s.", fieldClass, DrillFunc.class.getSimpleName(), Joiner.on(",").join(UdfUtilities.INJECTABLE_GETTER_METHODS.keySet())), func, field);
            }
            WorkspaceReference wsReference = new WorkspaceReference(fieldClass, field.getName(), isInject);
            if (!isInject && template.scope() == FunctionScope.POINT_AGGREGATE && !ValueHolder.class.isAssignableFrom(fieldClass)) {
                return failure(String.format("Aggregate function '%s' workspace variable '%s' is of type '%s'. Please change it to Holder type.", func.getClassName(), field.getName(), fieldClass), func, field);
            }
            //If the workspace var is of Holder type, get its MajorType and assign to WorkspaceReference.
            if (ValueHolder.class.isAssignableFrom(fieldClass)) {
                MajorType majorType = null;
                try {
                    majorType = getStaticFieldValue("TYPE", fieldClass, MajorType.class);
                } catch (Exception e) {
                    return failure("Failure while trying to access the ValueHolder's TYPE static variable.  All ValueHolders must contain a static TYPE variable that defines their MajorType.", e, func, field);
                }
                wsReference.setMajorType(majorType);
            }
            workspaceFields.add(wsReference);
        }
    }
    if (outputField == null) {
        return failure("This function declares zero output fields.  A function must declare one output field.", func);
    }
    FunctionInitializer initializer = new FunctionInitializer(func.getClassName(), classLoader);
    try {
        // return holder
        ValueReference[] ps = params.toArray(new ValueReference[params.size()]);
        WorkspaceReference[] works = workspaceFields.toArray(new WorkspaceReference[workspaceFields.size()]);
        FunctionAttributes functionAttributes = new FunctionAttributes(template, ps, outputField, works);
        switch(template.scope()) {
            case POINT_AGGREGATE:
                return new DrillAggFuncHolder(functionAttributes, initializer);
            case SIMPLE:
                return outputField.isComplexWriter() ? new DrillComplexWriterFuncHolder(functionAttributes, initializer) : new DrillSimpleFuncHolder(functionAttributes, initializer);
            case HOLISTIC_AGGREGATE:
            case RANGE_AGGREGATE:
            default:
                return failure("Unsupported Function Type.", func);
        }
    } catch (Exception | NoSuchFieldError | AbstractMethodError ex) {
        return failure("Failure while creating function holder.", ex, func);
    }
}

Example 7 with ValueHolder

use of org.apache.drill.exec.expr.holders.ValueHolder in project drill by apache.

the class RangeExprEvaluator method evalCastFunc.

private Statistics evalCastFunc(FunctionHolderExpression holderExpr, Statistics input) {
    try {
        DrillSimpleFuncHolder funcHolder = (DrillSimpleFuncHolder) holderExpr.getHolder();
        DrillSimpleFunc interpreter = funcHolder.createInterpreter();
        final ValueHolder minHolder, maxHolder;
        TypeProtos.MinorType srcType = holderExpr.args.get(0).getMajorType().getMinorType();
        TypeProtos.MinorType destType = holderExpr.getMajorType().getMinorType();
        if (srcType.equals(destType)) {
            // same type cast ==> NoOp.
            return input;
        } else if (!CAST_FUNC.containsKey(srcType) || !CAST_FUNC.get(srcType).contains(destType)) {
            // cast func between srcType and destType is NOT allowed.
            return null;
        }
        switch(srcType) {
            case INT:
                minHolder = ValueHolderHelper.getIntHolder(((IntStatistics) input).getMin());
                maxHolder = ValueHolderHelper.getIntHolder(((IntStatistics) input).getMax());
                break;
            case BIGINT:
                minHolder = ValueHolderHelper.getBigIntHolder(((LongStatistics) input).getMin());
                maxHolder = ValueHolderHelper.getBigIntHolder(((LongStatistics) input).getMax());
                break;
            case FLOAT4:
                minHolder = ValueHolderHelper.getFloat4Holder(((FloatStatistics) input).getMin());
                maxHolder = ValueHolderHelper.getFloat4Holder(((FloatStatistics) input).getMax());
                break;
            case FLOAT8:
                minHolder = ValueHolderHelper.getFloat8Holder(((DoubleStatistics) input).getMin());
                maxHolder = ValueHolderHelper.getFloat8Holder(((DoubleStatistics) input).getMax());
                break;
            default:
                return null;
        }
        final ValueHolder[] args1 = { minHolder };
        final ValueHolder[] args2 = { maxHolder };
        final ValueHolder minFuncHolder = InterpreterEvaluator.evaluateFunction(interpreter, args1, holderExpr.getName());
        final ValueHolder maxFuncHolder = InterpreterEvaluator.evaluateFunction(interpreter, args2, holderExpr.getName());
        switch(destType) {
            //TODO : need handle # of nulls.
            case INT:
                return getStatistics(((IntHolder) minFuncHolder).value, ((IntHolder) maxFuncHolder).value);
            case BIGINT:
                return getStatistics(((BigIntHolder) minFuncHolder).value, ((BigIntHolder) maxFuncHolder).value);
            case FLOAT4:
                return getStatistics(((Float4Holder) minFuncHolder).value, ((Float4Holder) maxFuncHolder).value);
            case FLOAT8:
                return getStatistics(((Float8Holder) minFuncHolder).value, ((Float8Holder) maxFuncHolder).value);
            default:
                return null;
        }
    } catch (Exception e) {
        throw new DrillRuntimeException("Error in evaluating function of " + holderExpr.getName());
    }
}

Example 8 with ValueHolder

use of org.apache.drill.exec.expr.holders.ValueHolder in project drill by apache.

the class FragmentContext method getConstantValueHolder.

@Override
public ValueHolder getConstantValueHolder(String value, MinorType type, Function<DrillBuf, ValueHolder> holderInitializer) {
    if (!constantValueHolderCache.containsKey(value)) {
        constantValueHolderCache.put(value, Maps.<MinorType, ValueHolder>newHashMap());
    }
    Map<MinorType, ValueHolder> holdersByType = constantValueHolderCache.get(value);
    ValueHolder valueHolder = holdersByType.get(type);
    if (valueHolder == null) {
        valueHolder = holderInitializer.apply(getManagedBuffer());
        holdersByType.put(type, valueHolder);
    }
    return valueHolder;
}