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

Example 56 with AssignOperator

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

the class AbstractIntroduceAccessMethodRule method getFieldNameFromSubTree.

/**
     * Returns the field name corresponding to the assigned variable at
     * varIndex. Returns null if the expr at varIndex does not yield to a field
     * access function after following a set of allowed functions.
     *
     * @throws AlgebricksException
     */
protected List<String> getFieldNameFromSubTree(IOptimizableFuncExpr optFuncExpr, OptimizableOperatorSubTree subTree, int opIndex, int assignVarIndex, ARecordType recordType, int funcVarIndex, ILogicalExpression parentFuncExpr, LogicalVariable recordVar, ARecordType metaType, LogicalVariable metaVar) throws AlgebricksException {
    // Get expression corresponding to opVar at varIndex.
    AbstractLogicalExpression expr = null;
    AbstractFunctionCallExpression childFuncExpr = null;
    AbstractLogicalOperator op = subTree.getAssignsAndUnnests().get(opIndex);
    if (op.getOperatorTag() == LogicalOperatorTag.ASSIGN) {
        AssignOperator assignOp = (AssignOperator) op;
        expr = (AbstractLogicalExpression) assignOp.getExpressions().get(assignVarIndex).getValue();
        // Can't get a field name from a constant expression. So, return null.
        if (expr.getExpressionTag() == LogicalExpressionTag.CONSTANT) {
            return Collections.emptyList();
        }
        childFuncExpr = (AbstractFunctionCallExpression) expr;
    } else {
        UnnestOperator unnestOp = (UnnestOperator) op;
        expr = (AbstractLogicalExpression) unnestOp.getExpressionRef().getValue();
        if (expr.getExpressionTag() != LogicalExpressionTag.FUNCTION_CALL) {
            return Collections.emptyList();
        }
        childFuncExpr = (AbstractFunctionCallExpression) expr;
        if (childFuncExpr.getFunctionIdentifier() != BuiltinFunctions.SCAN_COLLECTION) {
            return Collections.emptyList();
        }
        expr = (AbstractLogicalExpression) childFuncExpr.getArguments().get(0).getValue();
    }
    if (expr.getExpressionTag() != LogicalExpressionTag.FUNCTION_CALL) {
        return Collections.emptyList();
    }
    AbstractFunctionCallExpression funcExpr = (AbstractFunctionCallExpression) expr;
    FunctionIdentifier funcIdent = funcExpr.getFunctionIdentifier();
    boolean isByName = false;
    boolean isFieldAccess = false;
    String fieldName = null;
    List<String> nestedAccessFieldName = null;
    int fieldIndex = -1;
    if (funcIdent == BuiltinFunctions.FIELD_ACCESS_BY_NAME) {
        fieldName = ConstantExpressionUtil.getStringArgument(funcExpr, 1);
        if (fieldName == null) {
            return Collections.emptyList();
        }
        isFieldAccess = true;
        isByName = true;
    } else if (funcIdent == BuiltinFunctions.FIELD_ACCESS_BY_INDEX) {
        Integer idx = ConstantExpressionUtil.getIntArgument(funcExpr, 1);
        if (idx == null) {
            return Collections.emptyList();
        }
        fieldIndex = idx;
        isFieldAccess = true;
    } else if (funcIdent == BuiltinFunctions.FIELD_ACCESS_NESTED) {
        ILogicalExpression nameArg = funcExpr.getArguments().get(1).getValue();
        if (nameArg.getExpressionTag() != LogicalExpressionTag.CONSTANT) {
            return Collections.emptyList();
        }
        ConstantExpression constExpr = (ConstantExpression) nameArg;
        AOrderedList orderedNestedFieldName = (AOrderedList) ((AsterixConstantValue) constExpr.getValue()).getObject();
        nestedAccessFieldName = new ArrayList<>();
        for (int i = 0; i < orderedNestedFieldName.size(); i++) {
            nestedAccessFieldName.add(((AString) orderedNestedFieldName.getItem(i)).getStringValue());
        }
        isFieldAccess = true;
        isByName = true;
    }
    if (isFieldAccess) {
        LogicalVariable sourceVar = ((VariableReferenceExpression) funcExpr.getArguments().get(0).getValue()).getVariableReference();
        optFuncExpr.setLogicalExpr(funcVarIndex, parentFuncExpr);
        int[] assignAndExpressionIndexes = null;
        //go forward through nested assigns until you find the relevant one
        for (int i = opIndex + 1; i < subTree.getAssignsAndUnnests().size(); i++) {
            AbstractLogicalOperator subOp = subTree.getAssignsAndUnnests().get(i);
            List<LogicalVariable> varList;
            if (subOp.getOperatorTag() == LogicalOperatorTag.ASSIGN) {
                //Nested was an assign
                varList = ((AssignOperator) subOp).getVariables();
            } else if (subOp.getOperatorTag() == LogicalOperatorTag.UNNEST) {
                //Nested is not an assign
                varList = ((UnnestOperator) subOp).getVariables();
            } else {
                break;
            }
            //Go through variables in assign to check for match
            for (int varIndex = 0; varIndex < varList.size(); varIndex++) {
                LogicalVariable var = varList.get(varIndex);
                ArrayList<LogicalVariable> parentVars = new ArrayList<>();
                expr.getUsedVariables(parentVars);
                if (parentVars.contains(var)) {
                    //Found the variable we are looking for.
                    //return assign and index of expression
                    int[] returnValues = { i, varIndex };
                    assignAndExpressionIndexes = returnValues;
                }
            }
        }
        if (assignAndExpressionIndexes != null && assignAndExpressionIndexes[0] > -1) {
            //We found the nested assign
            //Recursive call on nested assign
            List<String> parentFieldNames = getFieldNameFromSubTree(optFuncExpr, subTree, assignAndExpressionIndexes[0], assignAndExpressionIndexes[1], recordType, funcVarIndex, parentFuncExpr, recordVar, metaType, metaVar);
            if (parentFieldNames.isEmpty()) {
                //We will not use index
                return Collections.emptyList();
            }
            if (!isByName) {
                fieldName = sourceVar.equals(metaVar) ? ((ARecordType) metaType.getSubFieldType(parentFieldNames)).getFieldNames()[fieldIndex] : ((ARecordType) recordType.getSubFieldType(parentFieldNames)).getFieldNames()[fieldIndex];
            }
            optFuncExpr.setSourceVar(funcVarIndex, ((AssignOperator) op).getVariables().get(assignVarIndex));
            //add fieldName to the nested fieldName, return
            if (nestedAccessFieldName != null) {
                for (int i = 0; i < nestedAccessFieldName.size(); i++) {
                    parentFieldNames.add(nestedAccessFieldName.get(i));
                }
            } else {
                parentFieldNames.add(fieldName);
            }
            return (parentFieldNames);
        }
        optFuncExpr.setSourceVar(funcVarIndex, ((AssignOperator) op).getVariables().get(assignVarIndex));
        //no nested assign, we are at the lowest level.
        if (isByName) {
            if (nestedAccessFieldName != null) {
                return nestedAccessFieldName;
            }
            return new ArrayList<>(Arrays.asList(fieldName));
        }
        return new ArrayList<>(Arrays.asList(sourceVar.equals(metaVar) ? metaType.getFieldNames()[fieldIndex] : recordType.getFieldNames()[fieldIndex]));
    }
    if (!funcIDSetThatRetainFieldName.contains(funcIdent)) {
        return Collections.emptyList();
    }
    // We use a part of the field in edit distance computation
    if (optFuncExpr.getFuncExpr().getFunctionIdentifier() == BuiltinFunctions.EDIT_DISTANCE_CHECK) {
        optFuncExpr.setPartialField(true);
    }
    // We expect the function's argument to be a variable, otherwise we
    // cannot apply an index.
    ILogicalExpression argExpr = funcExpr.getArguments().get(0).getValue();
    if (argExpr.getExpressionTag() != LogicalExpressionTag.VARIABLE) {
        return Collections.emptyList();
    }
    LogicalVariable curVar = ((VariableReferenceExpression) argExpr).getVariableReference();
    // the current operator
    for (int assignOrUnnestIndex = opIndex + 1; assignOrUnnestIndex < subTree.getAssignsAndUnnests().size(); assignOrUnnestIndex++) {
        AbstractLogicalOperator curOp = subTree.getAssignsAndUnnests().get(assignOrUnnestIndex);
        if (curOp.getOperatorTag() == LogicalOperatorTag.ASSIGN) {
            AssignOperator assignOp = (AssignOperator) curOp;
            List<LogicalVariable> varList = assignOp.getVariables();
            for (int varIndex = 0; varIndex < varList.size(); varIndex++) {
                LogicalVariable var = varList.get(varIndex);
                if (var.equals(curVar)) {
                    optFuncExpr.setSourceVar(funcVarIndex, var);
                    return getFieldNameFromSubTree(optFuncExpr, subTree, assignOrUnnestIndex, varIndex, recordType, funcVarIndex, childFuncExpr, recordVar, metaType, metaVar);
                }
            }
        } else {
            UnnestOperator unnestOp = (UnnestOperator) curOp;
            LogicalVariable var = unnestOp.getVariable();
            if (var.equals(curVar)) {
                getFieldNameFromSubTree(optFuncExpr, subTree, assignOrUnnestIndex, 0, recordType, funcVarIndex, childFuncExpr, recordVar, metaType, metaVar);
            }
        }
    }
    return Collections.emptyList();
}

Example 57 with AssignOperator

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

the class SimilarityCheckRule method rewritePost.

@Override
public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context) throws AlgebricksException {
    AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue();
    // Look for select.
    if (op.getOperatorTag() != LogicalOperatorTag.SELECT) {
        return false;
    }
    SelectOperator select = (SelectOperator) op;
    Mutable<ILogicalExpression> condExpr = select.getCondition();
    // Gather assigns below this select.
    List<AssignOperator> assigns = new ArrayList<AssignOperator>();
    AbstractLogicalOperator childOp = (AbstractLogicalOperator) select.getInputs().get(0).getValue();
    // Skip selects.
    while (childOp.getOperatorTag() == LogicalOperatorTag.SELECT) {
        childOp = (AbstractLogicalOperator) childOp.getInputs().get(0).getValue();
    }
    while (childOp.getOperatorTag() == LogicalOperatorTag.ASSIGN) {
        assigns.add((AssignOperator) childOp);
        childOp = (AbstractLogicalOperator) childOp.getInputs().get(0).getValue();
    }
    return replaceSelectConditionExprs(condExpr, assigns, context);
}

Example 58 with AssignOperator

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

the class RemoveLeftOuterUnnestForLeftOuterJoinRule method removeGroupByAndOuterUnnest.

// Performs the actual rewrite.
private void removeGroupByAndOuterUnnest(Mutable<ILogicalOperator> opRef, IOptimizationContext context, LeftOuterUnnestOperator outerUnnest, GroupByOperator gbyOperator, LeftOuterJoinOperator lojOperator, LogicalVariable listifyVar) throws AlgebricksException {
    List<LogicalVariable> lhs = new ArrayList<>();
    List<Mutable<ILogicalExpression>> rhs = new ArrayList<>();
    lhs.add(outerUnnest.getVariable());
    rhs.add(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(listifyVar)));
    List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> gbyList = gbyOperator.getGroupByList();
    for (Pair<LogicalVariable, Mutable<ILogicalExpression>> gbyPair : gbyList) {
        lhs.add(gbyPair.first);
        rhs.add(gbyPair.second);
    }
    AssignOperator assignOp = new AssignOperator(lhs, rhs);
    assignOp.getInputs().add(new MutableObject<ILogicalOperator>(lojOperator));
    context.computeAndSetTypeEnvironmentForOperator(assignOp);
    opRef.setValue(assignOp);
}

Example 59 with AssignOperator

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

the class RemoveRedundantListifyRule method appliesForReverseCase.

private boolean appliesForReverseCase(Mutable<ILogicalOperator> opRef, Set<LogicalVariable> varUsedAbove, IOptimizationContext context) throws AlgebricksException {
    AbstractLogicalOperator op1 = (AbstractLogicalOperator) opRef.getValue();
    if (op1.getOperatorTag() != LogicalOperatorTag.AGGREGATE) {
        return false;
    }
    AggregateOperator agg = (AggregateOperator) op1;
    if (agg.getVariables().size() > 1 || agg.getVariables().size() <= 0) {
        return false;
    }
    LogicalVariable aggVar = agg.getVariables().get(0);
    ILogicalExpression aggFun = agg.getExpressions().get(0).getValue();
    AbstractFunctionCallExpression f = (AbstractFunctionCallExpression) aggFun;
    if (!BuiltinFunctions.LISTIFY.equals(f.getFunctionIdentifier())) {
        return false;
    }
    if (f.getArguments().size() != 1) {
        return false;
    }
    ILogicalExpression arg0 = f.getArguments().get(0).getValue();
    if (((AbstractLogicalExpression) arg0).getExpressionTag() != LogicalExpressionTag.VARIABLE) {
        return false;
    }
    LogicalVariable aggInputVar = ((VariableReferenceExpression) arg0).getVariableReference();
    if (varUsedAbove.contains(aggInputVar)) {
        return false;
    }
    if (agg.getInputs().size() == 0) {
        return false;
    }
    AbstractLogicalOperator op2 = (AbstractLogicalOperator) agg.getInputs().get(0).getValue();
    if (op2.getOperatorTag() != LogicalOperatorTag.UNNEST) {
        return false;
    }
    UnnestOperator unnest = (UnnestOperator) op2;
    if (unnest.getPositionalVariable() != null) {
        return false;
    }
    if (!unnest.getVariable().equals(aggInputVar)) {
        return false;
    }
    ILogicalExpression unnestArg = unnest.getExpressionRef().getValue();
    if (unnestArg.getExpressionTag() != LogicalExpressionTag.FUNCTION_CALL) {
        return false;
    }
    AbstractFunctionCallExpression scanFunc = (AbstractFunctionCallExpression) unnestArg;
    if (scanFunc.getFunctionIdentifier() != BuiltinFunctions.SCAN_COLLECTION) {
        return false;
    }
    if (scanFunc.getArguments().size() != 1) {
        return false;
    }
    List<LogicalVariable> assgnVars = new ArrayList<>(1);
    assgnVars.add(aggVar);
    AssignOperator assign = new AssignOperator(assgnVars, scanFunc.getArguments());
    assign.getInputs().add(unnest.getInputs().get(0));
    context.computeAndSetTypeEnvironmentForOperator(assign);
    opRef.setValue(assign);
    return true;
}

Example 60 with AssignOperator

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

the class SimilarityCheckRule method replaceWithVariableArg.

private boolean replaceWithVariableArg(Mutable<ILogicalExpression> expRef, FunctionIdentifier normFuncIdent, AsterixConstantValue constVal, VariableReferenceExpression varRefExpr, List<AssignOperator> assigns, IOptimizationContext context) throws AlgebricksException {
    // Find variable in assigns to determine its originating function.
    LogicalVariable var = varRefExpr.getVariableReference();
    Mutable<ILogicalExpression> simFuncExprRef = null;
    ScalarFunctionCallExpression simCheckFuncExpr = null;
    AssignOperator matchingAssign = null;
    for (int i = 0; i < assigns.size(); i++) {
        AssignOperator assign = assigns.get(i);
        for (int j = 0; j < assign.getVariables().size(); j++) {
            // Check if variables match.
            if (var != assign.getVariables().get(j)) {
                continue;
            }
            // Check if corresponding expr is a function call.
            if (assign.getExpressions().get(j).getValue().getExpressionTag() != LogicalExpressionTag.FUNCTION_CALL) {
                continue;
            }
            simFuncExprRef = assign.getExpressions().get(j);
            // Analyze function expression and get equivalent similarity check function.
            simCheckFuncExpr = getSimilarityCheckExpr(normFuncIdent, constVal, (AbstractFunctionCallExpression) simFuncExprRef.getValue());
            matchingAssign = assign;
            break;
        }
        if (simCheckFuncExpr != null) {
            break;
        }
    }
    // Only non-null if we found that varRefExpr refers to an optimizable similarity function call.
    if (simCheckFuncExpr != null) {
        // Create a new assign under matchingAssign which assigns the result of our similarity-check function to a variable.
        LogicalVariable newVar = context.newVar();
        AssignOperator newAssign = new AssignOperator(newVar, new MutableObject<ILogicalExpression>(simCheckFuncExpr));
        // Hook up inputs.
        newAssign.getInputs().add(new MutableObject<ILogicalOperator>(matchingAssign.getInputs().get(0).getValue()));
        matchingAssign.getInputs().get(0).setValue(newAssign);
        // Replace select condition with a get-item on newVarFromExpression.
        List<Mutable<ILogicalExpression>> selectGetItemArgs = new ArrayList<Mutable<ILogicalExpression>>();
        // First arg is a variable reference expr on newVarFromExpression.
        selectGetItemArgs.add(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(newVar)));
        // Second arg is the item index to be accessed, here 0.
        selectGetItemArgs.add(new MutableObject<ILogicalExpression>(new ConstantExpression(new AsterixConstantValue(new AInt32(0)))));
        ILogicalExpression selectGetItemExpr = new ScalarFunctionCallExpression(FunctionUtil.getFunctionInfo(BuiltinFunctions.GET_ITEM), selectGetItemArgs);
        // Replace the old similarity function call with the new getItemExpr.
        expRef.setValue(selectGetItemExpr);
        // Replace expr corresponding to original variable in the original assign with a get-item on
        // newVarFromExpression.
        List<Mutable<ILogicalExpression>> assignGetItemArgs = new ArrayList<Mutable<ILogicalExpression>>();
        // First arg is a variable reference expr on newVarFromExpression.
        assignGetItemArgs.add(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(newVar)));
        // Second arg is the item index to be accessed, here 1.
        assignGetItemArgs.add(new MutableObject<ILogicalExpression>(new ConstantExpression(new AsterixConstantValue(new AInt32(1)))));
        ILogicalExpression assignGetItemExpr = new ScalarFunctionCallExpression(FunctionUtil.getFunctionInfo(BuiltinFunctions.GET_ITEM), assignGetItemArgs);
        // Replace the original assign expr with the get-item expr.
        simFuncExprRef.setValue(assignGetItemExpr);
        context.computeAndSetTypeEnvironmentForOperator(newAssign);
        context.computeAndSetTypeEnvironmentForOperator(matchingAssign);
        return true;
    }
    return false;
}