Examples with IAlgebricksConstantValue org.apache.hyracks.algebricks.core.algebra.expressions.IAlgebricksConstantValue used on opensource projects

Example 1 with IAlgebricksConstantValue

use of org.apache.hyracks.algebricks.core.algebra.expressions.IAlgebricksConstantValue in project asterixdb by apache.

the class UnnestToDataScanRule method handleFunction.

protected boolean handleFunction(Mutable<ILogicalOperator> opRef, IOptimizationContext context, UnnestOperator unnest, AbstractFunctionCallExpression f) throws AlgebricksException {
    FunctionIdentifier fid = f.getFunctionIdentifier();
    if (fid.equals(BuiltinFunctions.DATASET)) {
        if (unnest.getPositionalVariable() != null) {
            // TODO remove this after enabling the support of positional variables in data scan
            throw new AlgebricksException("No positional variables are allowed over datasets.");
        }
        ILogicalExpression expr = f.getArguments().get(0).getValue();
        if (expr.getExpressionTag() != LogicalExpressionTag.CONSTANT) {
            return false;
        }
        ConstantExpression ce = (ConstantExpression) expr;
        IAlgebricksConstantValue acv = ce.getValue();
        if (!(acv instanceof AsterixConstantValue)) {
            return false;
        }
        AsterixConstantValue acv2 = (AsterixConstantValue) acv;
        if (acv2.getObject().getType().getTypeTag() != ATypeTag.STRING) {
            return false;
        }
        String datasetArg = ((AString) acv2.getObject()).getStringValue();
        MetadataProvider metadataProvider = (MetadataProvider) context.getMetadataProvider();
        Pair<String, String> datasetReference = parseDatasetReference(metadataProvider, datasetArg);
        String dataverseName = datasetReference.first;
        String datasetName = datasetReference.second;
        Dataset dataset = metadataProvider.findDataset(dataverseName, datasetName);
        if (dataset == null) {
            throw new AlgebricksException("Could not find dataset " + datasetName + " in dataverse " + dataverseName);
        }
        DataSourceId asid = new DataSourceId(dataverseName, datasetName);
        List<LogicalVariable> variables = new ArrayList<>();
        if (dataset.getDatasetType() == DatasetType.INTERNAL) {
            int numPrimaryKeys = dataset.getPrimaryKeys().size();
            for (int i = 0; i < numPrimaryKeys; i++) {
                variables.add(context.newVar());
            }
        }
        variables.add(unnest.getVariable());
        DataSource dataSource = metadataProvider.findDataSource(asid);
        boolean hasMeta = dataSource.hasMeta();
        if (hasMeta) {
            variables.add(context.newVar());
        }
        DataSourceScanOperator scan = new DataSourceScanOperator(variables, dataSource);
        List<Mutable<ILogicalOperator>> scanInpList = scan.getInputs();
        scanInpList.addAll(unnest.getInputs());
        opRef.setValue(scan);
        addPrimaryKey(variables, dataSource, context);
        context.computeAndSetTypeEnvironmentForOperator(scan);
        // Adds equivalence classes --- one equivalent class between a primary key
        // variable and a record field-access expression.
        IAType[] schemaTypes = dataSource.getSchemaTypes();
        ARecordType recordType = (ARecordType) (hasMeta ? schemaTypes[schemaTypes.length - 2] : schemaTypes[schemaTypes.length - 1]);
        ARecordType metaRecordType = (ARecordType) (hasMeta ? schemaTypes[schemaTypes.length - 1] : null);
        EquivalenceClassUtils.addEquivalenceClassesForPrimaryIndexAccess(scan, variables, recordType, metaRecordType, dataset, context);
        return true;
    } else if (fid.equals(BuiltinFunctions.FEED_COLLECT)) {
        if (unnest.getPositionalVariable() != null) {
            throw new AlgebricksException("No positional variables are allowed over feeds.");
        }
        String dataverse = ConstantExpressionUtil.getStringArgument(f, 0);
        String sourceFeedName = ConstantExpressionUtil.getStringArgument(f, 1);
        String getTargetFeed = ConstantExpressionUtil.getStringArgument(f, 2);
        String subscriptionLocation = ConstantExpressionUtil.getStringArgument(f, 3);
        String targetDataset = ConstantExpressionUtil.getStringArgument(f, 4);
        String outputType = ConstantExpressionUtil.getStringArgument(f, 5);
        MetadataProvider metadataProvider = (MetadataProvider) context.getMetadataProvider();
        DataSourceId asid = new DataSourceId(dataverse, getTargetFeed);
        String policyName = metadataProvider.getConfig().get(FeedActivityDetails.FEED_POLICY_NAME);
        FeedPolicyEntity policy = metadataProvider.findFeedPolicy(dataverse, policyName);
        if (policy == null) {
            policy = BuiltinFeedPolicies.getFeedPolicy(policyName);
            if (policy == null) {
                throw new AlgebricksException("Unknown feed policy:" + policyName);
            }
        }
        ArrayList<LogicalVariable> feedDataScanOutputVariables = new ArrayList<>();
        String csLocations = metadataProvider.getConfig().get(FeedActivityDetails.COLLECT_LOCATIONS);
        List<LogicalVariable> pkVars = new ArrayList<>();
        FeedDataSource ds = createFeedDataSource(asid, targetDataset, sourceFeedName, subscriptionLocation, metadataProvider, policy, outputType, csLocations, unnest.getVariable(), context, pkVars);
        // The order for feeds is <Record-Meta-PK>
        feedDataScanOutputVariables.add(unnest.getVariable());
        // Does it produce meta?
        if (ds.hasMeta()) {
            feedDataScanOutputVariables.add(context.newVar());
        }
        // Does it produce pk?
        if (ds.isChange()) {
            feedDataScanOutputVariables.addAll(pkVars);
        }
        DataSourceScanOperator scan = new DataSourceScanOperator(feedDataScanOutputVariables, ds);
        List<Mutable<ILogicalOperator>> scanInpList = scan.getInputs();
        scanInpList.addAll(unnest.getInputs());
        opRef.setValue(scan);
        context.computeAndSetTypeEnvironmentForOperator(scan);
        return true;
    }
    return false;
}

Example 2 with IAlgebricksConstantValue

use of org.apache.hyracks.algebricks.core.algebra.expressions.IAlgebricksConstantValue in project asterixdb by apache.

the class ConstantExpressionUtil method getConstantIaObject.

public static IAObject getConstantIaObject(ILogicalExpression expr, ATypeTag typeTag) {
    if (expr.getExpressionTag() != LogicalExpressionTag.CONSTANT) {
        return null;
    }
    final IAlgebricksConstantValue acv = ((ConstantExpression) expr).getValue();
    if (!(acv instanceof AsterixConstantValue)) {
        return null;
    }
    final IAObject iaObject = ((AsterixConstantValue) acv).getObject();
    if (typeTag != null) {
        return iaObject.getType().getTypeTag() == typeTag ? iaObject : null;
    } else {
        return iaObject;
    }
}