Examples with AssignOperator org.apache.hyracks.algebricks.core.algebra.operators.logical.AssignOperator used on opensource projects

Example 41 with AssignOperator

use of org.apache.hyracks.algebricks.core.algebra.operators.logical.AssignOperator in project asterixdb by apache.

the class IntroduceGroupByForSubplanRule method rewritePost.

@Override
public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context) throws AlgebricksException {
    AbstractLogicalOperator op0 = (AbstractLogicalOperator) opRef.getValue();
    if (op0.getOperatorTag() != LogicalOperatorTag.SUBPLAN) {
        return false;
    }
    SubplanOperator subplan = (SubplanOperator) op0;
    Iterator<ILogicalPlan> plansIter = subplan.getNestedPlans().iterator();
    ILogicalPlan p = null;
    while (plansIter.hasNext()) {
        p = plansIter.next();
    }
    if (p == null) {
        return false;
    }
    if (p.getRoots().size() != 1) {
        return false;
    }
    Mutable<ILogicalOperator> subplanRoot = p.getRoots().get(0);
    AbstractLogicalOperator op1 = (AbstractLogicalOperator) subplanRoot.getValue();
    Mutable<ILogicalOperator> botRef = subplanRoot;
    AbstractLogicalOperator op2;
    // Project is optional
    if (op1.getOperatorTag() != LogicalOperatorTag.PROJECT) {
        op2 = op1;
    } else {
        ProjectOperator project = (ProjectOperator) op1;
        botRef = project.getInputs().get(0);
        op2 = (AbstractLogicalOperator) botRef.getValue();
    }
    if (op2.getOperatorTag() != LogicalOperatorTag.AGGREGATE) {
        return false;
    }
    AggregateOperator aggregate = (AggregateOperator) op2;
    Set<LogicalVariable> free = new HashSet<LogicalVariable>();
    VariableUtilities.getUsedVariables(aggregate, free);
    Mutable<ILogicalOperator> op3Ref = aggregate.getInputs().get(0);
    AbstractLogicalOperator op3 = (AbstractLogicalOperator) op3Ref.getValue();
    while (op3.getInputs().size() == 1) {
        Set<LogicalVariable> prod = new HashSet<LogicalVariable>();
        VariableUtilities.getProducedVariables(op3, prod);
        free.removeAll(prod);
        VariableUtilities.getUsedVariables(op3, free);
        botRef = op3Ref;
        op3Ref = op3.getInputs().get(0);
        op3 = (AbstractLogicalOperator) op3Ref.getValue();
    }
    if (op3.getOperatorTag() != LogicalOperatorTag.INNERJOIN && op3.getOperatorTag() != LogicalOperatorTag.LEFTOUTERJOIN) {
        return false;
    }
    AbstractBinaryJoinOperator join = (AbstractBinaryJoinOperator) op3;
    if (join.getCondition().getValue() == ConstantExpression.TRUE) {
        return false;
    }
    VariableUtilities.getUsedVariables(join, free);
    AbstractLogicalOperator b0 = (AbstractLogicalOperator) join.getInputs().get(0).getValue();
    // see if there's an NTS at the end of the pipeline
    NestedTupleSourceOperator outerNts = getNts(b0);
    if (outerNts == null) {
        AbstractLogicalOperator b1 = (AbstractLogicalOperator) join.getInputs().get(1).getValue();
        outerNts = getNts(b1);
        if (outerNts == null) {
            return false;
        }
    }
    Set<LogicalVariable> pkVars = computeGbyVars(outerNts, free, context);
    if (pkVars == null || pkVars.size() < 1) {
        // there is no non-trivial primary key, group-by keys are all live variables
        // that were produced by descendant or self
        ILogicalOperator subplanInput = subplan.getInputs().get(0).getValue();
        pkVars = new HashSet<LogicalVariable>();
        //get live variables
        VariableUtilities.getLiveVariables(subplanInput, pkVars);
        //get produced variables
        Set<LogicalVariable> producedVars = new HashSet<LogicalVariable>();
        VariableUtilities.getProducedVariablesInDescendantsAndSelf(subplanInput, producedVars);
        //retain the intersection
        pkVars.retainAll(producedVars);
    }
    AlgebricksConfig.ALGEBRICKS_LOGGER.fine("Found FD for introducing group-by: " + pkVars);
    Mutable<ILogicalOperator> rightRef = join.getInputs().get(1);
    LogicalVariable testForNull = null;
    AbstractLogicalOperator right = (AbstractLogicalOperator) rightRef.getValue();
    switch(right.getOperatorTag()) {
        case UNNEST:
            {
                UnnestOperator innerUnnest = (UnnestOperator) right;
                // Select [ $y != null ]
                testForNull = innerUnnest.getVariable();
                break;
            }
        case RUNNINGAGGREGATE:
            {
                ILogicalOperator inputToRunningAggregate = right.getInputs().get(0).getValue();
                Set<LogicalVariable> producedVars = new ListSet<LogicalVariable>();
                VariableUtilities.getProducedVariables(inputToRunningAggregate, producedVars);
                if (!producedVars.isEmpty()) {
                    // Select [ $y != null ]
                    testForNull = producedVars.iterator().next();
                }
                break;
            }
        case DATASOURCESCAN:
            {
                DataSourceScanOperator innerScan = (DataSourceScanOperator) right;
                // Select [ $y != null ]
                if (innerScan.getVariables().size() == 1) {
                    testForNull = innerScan.getVariables().get(0);
                }
                break;
            }
        default:
            break;
    }
    if (testForNull == null) {
        testForNull = context.newVar();
        AssignOperator tmpAsgn = new AssignOperator(testForNull, new MutableObject<ILogicalExpression>(ConstantExpression.TRUE));
        tmpAsgn.getInputs().add(new MutableObject<ILogicalOperator>(rightRef.getValue()));
        rightRef.setValue(tmpAsgn);
        context.computeAndSetTypeEnvironmentForOperator(tmpAsgn);
    }
    IFunctionInfo finfoEq = context.getMetadataProvider().lookupFunction(AlgebricksBuiltinFunctions.IS_MISSING);
    ILogicalExpression isNullTest = new ScalarFunctionCallExpression(finfoEq, new MutableObject<ILogicalExpression>(new VariableReferenceExpression(testForNull)));
    IFunctionInfo finfoNot = context.getMetadataProvider().lookupFunction(AlgebricksBuiltinFunctions.NOT);
    ScalarFunctionCallExpression nonNullTest = new ScalarFunctionCallExpression(finfoNot, new MutableObject<ILogicalExpression>(isNullTest));
    SelectOperator selectNonNull = new SelectOperator(new MutableObject<ILogicalExpression>(nonNullTest), false, null);
    GroupByOperator g = new GroupByOperator();
    Mutable<ILogicalOperator> newSubplanRef = new MutableObject<ILogicalOperator>(subplan);
    NestedTupleSourceOperator nts = new NestedTupleSourceOperator(new MutableObject<ILogicalOperator>(g));
    opRef.setValue(g);
    selectNonNull.getInputs().add(new MutableObject<ILogicalOperator>(nts));
    List<Mutable<ILogicalOperator>> prodInpList = botRef.getValue().getInputs();
    prodInpList.clear();
    prodInpList.add(new MutableObject<ILogicalOperator>(selectNonNull));
    ILogicalPlan gPlan = new ALogicalPlanImpl(new MutableObject<ILogicalOperator>(subplanRoot.getValue()));
    g.getNestedPlans().add(gPlan);
    subplanRoot.setValue(op3Ref.getValue());
    g.getInputs().add(newSubplanRef);
    HashSet<LogicalVariable> underVars = new HashSet<LogicalVariable>();
    VariableUtilities.getLiveVariables(subplan.getInputs().get(0).getValue(), underVars);
    underVars.removeAll(pkVars);
    Map<LogicalVariable, LogicalVariable> mappedVars = buildVarExprList(pkVars, context, g, g.getGroupByList());
    context.updatePrimaryKeys(mappedVars);
    for (LogicalVariable uv : underVars) {
        g.getDecorList().add(new Pair<LogicalVariable, Mutable<ILogicalExpression>>(null, new MutableObject<ILogicalExpression>(new VariableReferenceExpression(uv))));
    }
    OperatorPropertiesUtil.typeOpRec(subplanRoot, context);
    OperatorPropertiesUtil.typeOpRec(gPlan.getRoots().get(0), context);
    context.computeAndSetTypeEnvironmentForOperator(g);
    return true;
}

Example 42 with AssignOperator

use of org.apache.hyracks.algebricks.core.algebra.operators.logical.AssignOperator in project asterixdb by apache.

the class IsomorphismOperatorVisitor method visitAssignOperator.

@Override
public Boolean visitAssignOperator(AssignOperator op, ILogicalOperator arg) throws AlgebricksException {
    AbstractLogicalOperator aop = (AbstractLogicalOperator) arg;
    if (aop.getOperatorTag() != LogicalOperatorTag.ASSIGN) {
        return Boolean.FALSE;
    }
    AssignOperator assignOpArg = (AssignOperator) copyAndSubstituteVar(op, arg);
    boolean isomorphic = VariableUtilities.varListEqualUnordered(getPairList(op.getVariables(), op.getExpressions()), getPairList(assignOpArg.getVariables(), assignOpArg.getExpressions()));
    return isomorphic;
}

Example 43 with AssignOperator

use of org.apache.hyracks.algebricks.core.algebra.operators.logical.AssignOperator in project asterixdb by apache.

the class LogicalOperatorDeepCopyWithNewVariablesVisitor method visitAssignOperator.

@Override
public ILogicalOperator visitAssignOperator(AssignOperator op, ILogicalOperator arg) throws AlgebricksException {
    AssignOperator opCopy = new AssignOperator(deepCopyVariableList(op.getVariables()), exprDeepCopyVisitor.deepCopyExpressionReferenceList(op.getExpressions()));
    deepCopyInputsAnnotationsAndExecutionMode(op, arg, opCopy);
    return opCopy;
}

Example 44 with AssignOperator

use of org.apache.hyracks.algebricks.core.algebra.operators.logical.AssignOperator in project asterixdb by apache.

the class RemoveRedundantVariablesRule method removeRedundantVariables.

private boolean removeRedundantVariables(Mutable<ILogicalOperator> opRef, IOptimizationContext context) throws AlgebricksException {
    AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue();
    LogicalOperatorTag opTag = op.getOperatorTag();
    boolean modified = false;
    // Update equivalence class map.
    if (opTag == LogicalOperatorTag.ASSIGN) {
        AssignOperator assignOp = (AssignOperator) op;
        int numVars = assignOp.getVariables().size();
        for (int i = 0; i < numVars; i++) {
            ILogicalExpression expr = assignOp.getExpressions().get(i).getValue();
            if (expr.getExpressionTag() != LogicalExpressionTag.VARIABLE) {
                continue;
            }
            VariableReferenceExpression rhsVarRefExpr = (VariableReferenceExpression) expr;
            // Update equivalence class map.
            LogicalVariable lhs = assignOp.getVariables().get(i);
            LogicalVariable rhs = rhsVarRefExpr.getVariableReference();
            updateEquivalenceClassMap(lhs, rhs);
        }
    }
    // Replace variable references with their first representative.
    if (opTag == LogicalOperatorTag.PROJECT) {
        // The project operator does not use expressions, so we need to replace it's variables manually.
        if (replaceProjectVars((ProjectOperator) op)) {
            modified = true;
        }
    } else if (op.getOperatorTag() == LogicalOperatorTag.UNIONALL) {
        // Replace redundant variables manually in the UnionAll operator.
        if (replaceUnionAllVars((UnionAllOperator) op)) {
            modified = true;
        }
    } else {
        if (op.acceptExpressionTransform(substVisitor)) {
            modified = true;
        }
    }
    // Perform variable replacement in nested plans.
    if (op.hasNestedPlans()) {
        AbstractOperatorWithNestedPlans opWithNestedPlan = (AbstractOperatorWithNestedPlans) op;
        for (ILogicalPlan nestedPlan : opWithNestedPlan.getNestedPlans()) {
            for (Mutable<ILogicalOperator> rootRef : nestedPlan.getRoots()) {
                if (removeRedundantVariables(rootRef, context)) {
                    modified = true;
                }
            }
        }
    }
    // Deal with re-mapping of variables in group by.
    if (opTag == LogicalOperatorTag.GROUP) {
        if (handleGroupByVarRemapping((GroupByOperator) op)) {
            modified = true;
        }
    }
    if (modified) {
        context.computeAndSetTypeEnvironmentForOperator(op);
        context.addToDontApplySet(this, op);
    }
    // in the query plan.
    if (opTag == LogicalOperatorTag.DISTRIBUTE_RESULT || opTag == LogicalOperatorTag.SINK) {
        equivalentVarsMap.clear();
    }
    return modified;
}

Example 45 with AssignOperator

use of org.apache.hyracks.algebricks.core.algebra.operators.logical.AssignOperator in project asterixdb by apache.

the class RemoveUnusedAssignAndAggregateRule method collectUnusedAssignedVars.

private void collectUnusedAssignedVars(Mutable<ILogicalOperator> opRef, Set<LogicalVariable> accumulatedUsedVarFromRootSet, boolean first, IOptimizationContext context) throws AlgebricksException {
    AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue();
    if (!first) {
        context.addToDontApplySet(this, op);
    }
    Set<LogicalVariable> assignVarsSetInThisOp = new HashSet<>();
    Set<LogicalVariable> usedVarsSetInThisOp = new HashSet<>();
    // Add used variables in this operator to the accumulated used variables set?
    boolean addUsedVarsInThisOp = true;
    // ASSIGN, AGGREGATE, UNNEST, UNIONALL, or GROUP operator found?
    boolean targetOpFound = false;
    switch(op.getOperatorTag()) {
        case ASSIGN:
            AssignOperator assign = (AssignOperator) op;
            assignVarsSetInThisOp.addAll(assign.getVariables());
            targetOpFound = true;
            break;
        case AGGREGATE:
            AggregateOperator agg = (AggregateOperator) op;
            assignVarsSetInThisOp.addAll(agg.getVariables());
            targetOpFound = true;
            break;
        case UNNEST:
            UnnestOperator uOp = (UnnestOperator) op;
            LogicalVariable pVar = uOp.getPositionalVariable();
            if (pVar != null) {
                assignVarsSetInThisOp.add(pVar);
                targetOpFound = true;
            }
            break;
        case UNIONALL:
            UnionAllOperator unionOp = (UnionAllOperator) op;
            for (Triple<LogicalVariable, LogicalVariable, LogicalVariable> varMapping : unionOp.getVariableMappings()) {
                assignVarsSetInThisOp.add(varMapping.third);
            }
            targetOpFound = true;
            // Don't add used variables in UNIONALL.
            addUsedVarsInThisOp = false;
            break;
        case GROUP:
            GroupByOperator groupByOp = (GroupByOperator) op;
            for (Pair<LogicalVariable, Mutable<ILogicalExpression>> decorMapping : groupByOp.getDecorList()) {
                LogicalVariable decorVar = decorMapping.first;
                if (decorVar != null) {
                    assignVarsSetInThisOp.add(decorVar);
                    targetOpFound = true;
                } else {
                    // A decor var mapping can have a variable reference expression without a new variable
                    // definition, which is for rebinding the referred variable.
                    VariableReferenceExpression varExpr = (VariableReferenceExpression) decorMapping.second.getValue();
                    LogicalVariable reboundDecorVar = varExpr.getVariableReference();
                    assignVarsSetInThisOp.add(reboundDecorVar);
                }
            }
            break;
        default:
            break;
    }
    if (targetOpFound) {
        assignedVarMap.put(opRef, assignVarsSetInThisOp);
        assignedVarSet.addAll(assignVarsSetInThisOp);
    }
    if (addUsedVarsInThisOp) {
        VariableUtilities.getUsedVariables(op, usedVarsSetInThisOp);
        accumulatedUsedVarFromRootSet.addAll(usedVarsSetInThisOp);
        // paths in the plan.
        if (accumulatedUsedVarFromRootMap.containsKey(opRef)) {
            accumulatedUsedVarFromRootMap.get(opRef).addAll(accumulatedUsedVarFromRootSet);
        } else {
            accumulatedUsedVarFromRootMap.put(opRef, new HashSet<LogicalVariable>(accumulatedUsedVarFromRootSet));
        }
    } else {
        accumulatedUsedVarFromRootMap.put(opRef, new HashSet<LogicalVariable>(accumulatedUsedVarFromRootSet));
    }
    for (Mutable<ILogicalOperator> c : op.getInputs()) {
        collectUnusedAssignedVars(c, new HashSet<LogicalVariable>(accumulatedUsedVarFromRootSet), false, context);
    }
    if (op.hasNestedPlans()) {
        AbstractOperatorWithNestedPlans opWithNested = (AbstractOperatorWithNestedPlans) op;
        for (ILogicalPlan plan : opWithNested.getNestedPlans()) {
            for (Mutable<ILogicalOperator> r : plan.getRoots()) {
                collectUnusedAssignedVars(r, new HashSet<LogicalVariable>(accumulatedUsedVarFromRootSet), false, context);
            }
        }
    }
}