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

Example 41 with VariableReferenceExpression

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

the class SqlppExpressionToPlanTranslator method processSelectClause.

// Generates the return expression for a select clause.
private Pair<ILogicalOperator, LogicalVariable> processSelectClause(SelectBlock selectBlock, Mutable<ILogicalOperator> tupSrc) throws CompilationException {
    SelectClause selectClause = selectBlock.getSelectClause();
    Expression returnExpr;
    if (selectClause.selectElement()) {
        returnExpr = selectClause.getSelectElement().getExpression();
    } else {
        returnExpr = generateReturnExpr(selectClause, selectBlock);
    }
    Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo = langExprToAlgExpression(returnExpr, tupSrc);
    LogicalVariable returnVar;
    ILogicalOperator returnOperator;
    if (returnExpr.getKind() == Kind.VARIABLE_EXPRESSION) {
        VariableExpr varExpr = (VariableExpr) returnExpr;
        returnOperator = eo.second.getValue();
        returnVar = context.getVar(varExpr.getVar().getId());
    } else {
        returnVar = context.newVar();
        returnOperator = new AssignOperator(returnVar, new MutableObject<ILogicalExpression>(eo.first));
        returnOperator.getInputs().add(eo.second);
    }
    if (selectClause.distinct()) {
        DistinctOperator distinctOperator = new DistinctOperator(mkSingletonArrayList(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(returnVar))));
        distinctOperator.getInputs().add(new MutableObject<ILogicalOperator>(returnOperator));
        return new Pair<>(distinctOperator, returnVar);
    } else {
        return new Pair<>(returnOperator, returnVar);
    }
}

Example 42 with VariableReferenceExpression

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

the class AbstractDecorrelationRule method buildVarExprList.

protected void buildVarExprList(Collection<LogicalVariable> vars, IOptimizationContext context, GroupByOperator g, List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> outVeList) throws AlgebricksException {
    for (LogicalVariable ov : vars) {
        LogicalVariable newVar = context.newVar();
        ILogicalExpression varExpr = new VariableReferenceExpression(newVar);
        outVeList.add(new Pair<LogicalVariable, Mutable<ILogicalExpression>>(ov, new MutableObject<ILogicalExpression>(varExpr)));
        for (ILogicalPlan p : g.getNestedPlans()) {
            for (Mutable<ILogicalOperator> r : p.getRoots()) {
                OperatorManipulationUtil.substituteVarRec((AbstractLogicalOperator) r.getValue(), ov, newVar, true, context);
            }
        }
    }
}

Example 43 with VariableReferenceExpression

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

the class AbstractIntroduceCombinerRule method tryToPushAgg.

protected Pair<Boolean, Mutable<ILogicalOperator>> tryToPushAgg(AggregateOperator initAgg, GroupByOperator newGbyOp, Set<SimilarAggregatesInfo> toReplaceSet, IOptimizationContext context) throws AlgebricksException {
    ArrayList<LogicalVariable> pushedVars = new ArrayList<LogicalVariable>();
    ArrayList<Mutable<ILogicalExpression>> pushedExprs = new ArrayList<Mutable<ILogicalExpression>>();
    List<LogicalVariable> initVars = initAgg.getVariables();
    List<Mutable<ILogicalExpression>> initExprs = initAgg.getExpressions();
    int numExprs = initVars.size();
    // First make sure that all agg funcs are two step, otherwise we cannot use local aggs.
    for (int i = 0; i < numExprs; i++) {
        AggregateFunctionCallExpression aggFun = (AggregateFunctionCallExpression) initExprs.get(i).getValue();
        if (!aggFun.isTwoStep()) {
            return new Pair<Boolean, Mutable<ILogicalOperator>>(false, null);
        }
    }
    boolean haveAggToReplace = false;
    for (int i = 0; i < numExprs; i++) {
        Mutable<ILogicalExpression> expRef = initExprs.get(i);
        AggregateFunctionCallExpression aggFun = (AggregateFunctionCallExpression) expRef.getValue();
        IFunctionInfo fi1 = aggFun.getStepOneAggregate();
        // Clone the aggregate's args.
        List<Mutable<ILogicalExpression>> newArgs = new ArrayList<Mutable<ILogicalExpression>>(aggFun.getArguments().size());
        for (Mutable<ILogicalExpression> er : aggFun.getArguments()) {
            newArgs.add(new MutableObject<ILogicalExpression>(er.getValue().cloneExpression()));
        }
        IFunctionInfo fi2 = aggFun.getStepTwoAggregate();
        SimilarAggregatesInfo inf = new SimilarAggregatesInfo();
        LogicalVariable newAggVar = context.newVar();
        pushedVars.add(newAggVar);
        inf.stepOneResult = new VariableReferenceExpression(newAggVar);
        inf.simAggs = new ArrayList<AggregateExprInfo>();
        toReplaceSet.add(inf);
        AggregateFunctionCallExpression aggLocal = new AggregateFunctionCallExpression(fi1, false, newArgs);
        pushedExprs.add(new MutableObject<ILogicalExpression>(aggLocal));
        AggregateExprInfo aei = new AggregateExprInfo();
        aei.aggExprRef = expRef;
        aei.newFunInfo = fi2;
        inf.simAggs.add(aei);
        haveAggToReplace = true;
    }
    if (!pushedVars.isEmpty()) {
        AggregateOperator pushedAgg = new AggregateOperator(pushedVars, pushedExprs);
        pushedAgg.setExecutionMode(ExecutionMode.LOCAL);
        // If newGbyOp is null, then we optimizing an aggregate without group by.
        if (newGbyOp != null) {
            // Cut and paste nested input pipelines of initAgg to pushedAgg's input
            Mutable<ILogicalOperator> inputRef = initAgg.getInputs().get(0);
            Mutable<ILogicalOperator> bottomRef = inputRef;
            while (bottomRef.getValue().getInputs().size() > 0) {
                bottomRef = bottomRef.getValue().getInputs().get(0);
            }
            ILogicalOperator oldNts = bottomRef.getValue();
            initAgg.getInputs().clear();
            initAgg.getInputs().add(new MutableObject<ILogicalOperator>(oldNts));
            // Hook up the nested aggregate op with the outer group by.
            NestedTupleSourceOperator nts = new NestedTupleSourceOperator(new MutableObject<ILogicalOperator>(newGbyOp));
            nts.setExecutionMode(ExecutionMode.LOCAL);
            bottomRef.setValue(nts);
            pushedAgg.getInputs().add(inputRef);
        } else {
            // The local aggregate operator is fed by the input of the original aggregate operator.
            pushedAgg.getInputs().add(new MutableObject<ILogicalOperator>(initAgg.getInputs().get(0).getValue()));
            // Reintroduce assign op for the global agg partitioning var.
            initAgg.getInputs().get(0).setValue(pushedAgg);
            pushedAgg.setGlobal(false);
            context.computeAndSetTypeEnvironmentForOperator(pushedAgg);
        }
        return new Pair<Boolean, Mutable<ILogicalOperator>>(true, new MutableObject<ILogicalOperator>(pushedAgg));
    } else {
        return new Pair<Boolean, Mutable<ILogicalOperator>>(haveAggToReplace, null);
    }
}

Example 44 with VariableReferenceExpression

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

the class ExtractFunctionsFromJoinConditionRule method assignFunctionExpressions.

private boolean assignFunctionExpressions(AbstractLogicalOperator joinOp, ILogicalExpression expr, IOptimizationContext context) throws AlgebricksException {
    if (expr.getExpressionTag() != LogicalExpressionTag.FUNCTION_CALL) {
        return false;
    }
    AbstractFunctionCallExpression fexp = (AbstractFunctionCallExpression) expr;
    FunctionIdentifier fi = fexp.getFunctionIdentifier();
    boolean modified = false;
    if (fi.equals(AlgebricksBuiltinFunctions.AND) || fi.equals(AlgebricksBuiltinFunctions.OR) || processArgumentsToFunction(fi)) {
        for (Mutable<ILogicalExpression> a : fexp.getArguments()) {
            if (assignFunctionExpressions(joinOp, a.getValue(), context)) {
                modified = true;
            }
        }
        return modified;
    } else if (AlgebricksBuiltinFunctions.isComparisonFunction(fi) || isComparisonFunction(fi)) {
        for (Mutable<ILogicalExpression> exprRef : fexp.getArguments()) {
            if (exprRef.getValue().getExpressionTag() == LogicalExpressionTag.FUNCTION_CALL) {
                LogicalVariable newVar = context.newVar();
                AssignOperator newAssign = new AssignOperator(newVar, new MutableObject<ILogicalExpression>(exprRef.getValue().cloneExpression()));
                newAssign.setExecutionMode(joinOp.getExecutionMode());
                // Place assign below joinOp.
                List<LogicalVariable> used = new ArrayList<LogicalVariable>();
                VariableUtilities.getUsedVariables(newAssign, used);
                Mutable<ILogicalOperator> leftBranchRef = joinOp.getInputs().get(0);
                ILogicalOperator leftBranch = leftBranchRef.getValue();
                List<LogicalVariable> leftBranchVariables = new ArrayList<LogicalVariable>();
                VariableUtilities.getLiveVariables(leftBranch, leftBranchVariables);
                if (leftBranchVariables.containsAll(used)) {
                    // place assign on left branch
                    newAssign.getInputs().add(new MutableObject<ILogicalOperator>(leftBranch));
                    leftBranchRef.setValue(newAssign);
                    modified = true;
                } else {
                    Mutable<ILogicalOperator> rightBranchRef = joinOp.getInputs().get(1);
                    ILogicalOperator rightBranch = rightBranchRef.getValue();
                    List<LogicalVariable> rightBranchVariables = new ArrayList<LogicalVariable>();
                    VariableUtilities.getLiveVariables(rightBranch, rightBranchVariables);
                    if (rightBranchVariables.containsAll(used)) {
                        // place assign on right branch
                        newAssign.getInputs().add(new MutableObject<ILogicalOperator>(rightBranch));
                        rightBranchRef.setValue(newAssign);
                        modified = true;
                    }
                }
                if (modified) {
                    // Replace original expr with variable reference.
                    exprRef.setValue(new VariableReferenceExpression(newVar));
                    context.computeAndSetTypeEnvironmentForOperator(newAssign);
                    context.computeAndSetTypeEnvironmentForOperator(joinOp);
                }
            }
        }
        return modified;
    } else {
        return false;
    }
}

Example 45 with VariableReferenceExpression

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

the class ExtractGbyExpressionsRule method gbyExprWasRewritten.

private boolean gbyExprWasRewritten(GroupByOperator g, IOptimizationContext context) throws AlgebricksException {
    if (!gbyHasComplexExpr(g)) {
        return false;
    }
    Mutable<ILogicalOperator> opRef2 = g.getInputs().get(0);
    for (Pair<LogicalVariable, Mutable<ILogicalExpression>> gbyPair : g.getGroupByList()) {
        ILogicalExpression expr = gbyPair.second.getValue();
        if (expr.getExpressionTag() != LogicalExpressionTag.VARIABLE) {
            LogicalVariable v = extractExprIntoAssignOpRef(expr, opRef2, context);
            gbyPair.second.setValue(new VariableReferenceExpression(v));
        }
    }
    return true;
}