Examples with Clause org.apache.asterix.lang.common.base.Clause used on opensource projects

Example 16 with Clause

use of org.apache.asterix.lang.common.base.Clause in project asterixdb by apache.

the class AQLAstPrintVisitor method visit.

@Override
public Void visit(FLWOGRExpression flwor, Integer step) throws CompilationException {
    out.println(skip(step) + "FLWOGR [");
    for (Clause cl : flwor.getClauseList()) {
        cl.accept(this, step + 1);
    }
    out.println(skip(step + 1) + "Return");
    flwor.getReturnExpr().accept(this, step + 2);
    out.println(skip(step) + "]");
    return null;
}

Example 17 with Clause

use of org.apache.asterix.lang.common.base.Clause in project asterixdb by apache.

the class AQLCloneAndSubstituteVariablesVisitor method visit.

@Override
public Pair<ILangExpression, VariableSubstitutionEnvironment> visit(FLWOGRExpression flwor, VariableSubstitutionEnvironment env) throws CompilationException {
    List<Clause> newClauses = new ArrayList<Clause>(flwor.getClauseList().size());
    VariableSubstitutionEnvironment currentEnv = env;
    for (Clause c : flwor.getClauseList()) {
        Pair<ILangExpression, VariableSubstitutionEnvironment> p1 = c.accept(this, currentEnv);
        currentEnv = p1.second;
        newClauses.add((Clause) p1.first);
    }
    Pair<ILangExpression, VariableSubstitutionEnvironment> p2 = flwor.getReturnExpr().accept(this, currentEnv);
    Expression newReturnExpr = (Expression) p2.first;
    FLWOGRExpression newFlwor = new FLWOGRExpression(newClauses, newReturnExpr);
    return new Pair<ILangExpression, VariableSubstitutionEnvironment>(newFlwor, p2.second);
}

Example 18 with Clause

use of org.apache.asterix.lang.common.base.Clause in project asterixdb by apache.

the class AqlQueryRewriter method wrapInLets.

private void wrapInLets() {
    // it into a let clause.
    if (topStatement == null) {
        return;
    }
    Expression body = topStatement.getBody();
    if (body.getKind() != Kind.FLWOGR_EXPRESSION) {
        VarIdentifier var = context.newVariable();
        VariableExpr v = new VariableExpr(var);
        LetClause c1 = new LetClause(v, body);
        ArrayList<Clause> clauseList = new ArrayList<>(1);
        clauseList.add(c1);
        FLWOGRExpression newBody = new FLWOGRExpression(clauseList, new VariableExpr(var));
        topStatement.setBody(newBody);
    }
}

Example 19 with Clause

use of org.apache.asterix.lang.common.base.Clause in project asterixdb by apache.

the class FuzzyJoinRule method rewritePost.

@Override
public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context) throws AlgebricksException {
    AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue();
    // current opperator is join
    if (op.getOperatorTag() != LogicalOperatorTag.INNERJOIN && op.getOperatorTag() != LogicalOperatorTag.LEFTOUTERJOIN) {
        return false;
    }
    // Find GET_ITEM function.
    AbstractBinaryJoinOperator joinOp = (AbstractBinaryJoinOperator) op;
    Mutable<ILogicalExpression> expRef = joinOp.getCondition();
    Mutable<ILogicalExpression> getItemExprRef = getSimilarityExpression(expRef);
    if (getItemExprRef == null) {
        return false;
    }
    // Check if the GET_ITEM function is on one of the supported similarity-check functions.
    AbstractFunctionCallExpression getItemFuncExpr = (AbstractFunctionCallExpression) getItemExprRef.getValue();
    Mutable<ILogicalExpression> argRef = getItemFuncExpr.getArguments().get(0);
    AbstractFunctionCallExpression simFuncExpr = (AbstractFunctionCallExpression) argRef.getValue();
    if (!simFuncs.contains(simFuncExpr.getFunctionIdentifier())) {
        return false;
    }
    // Skip this rule based on annotations.
    if (simFuncExpr.getAnnotations().containsKey(IndexedNLJoinExpressionAnnotation.INSTANCE)) {
        return false;
    }
    List<Mutable<ILogicalOperator>> inputOps = joinOp.getInputs();
    ILogicalOperator leftInputOp = inputOps.get(0).getValue();
    ILogicalOperator rightInputOp = inputOps.get(1).getValue();
    List<Mutable<ILogicalExpression>> inputExps = simFuncExpr.getArguments();
    ILogicalExpression inputExp0 = inputExps.get(0).getValue();
    ILogicalExpression inputExp1 = inputExps.get(1).getValue();
    // left and right expressions are variables
    if (inputExp0.getExpressionTag() != LogicalExpressionTag.VARIABLE || inputExp1.getExpressionTag() != LogicalExpressionTag.VARIABLE) {
        return false;
    }
    LogicalVariable inputVar0 = ((VariableReferenceExpression) inputExp0).getVariableReference();
    LogicalVariable inputVar1 = ((VariableReferenceExpression) inputExp1).getVariableReference();
    LogicalVariable leftInputVar;
    LogicalVariable rightInputVar;
    liveVars.clear();
    VariableUtilities.getLiveVariables(leftInputOp, liveVars);
    if (liveVars.contains(inputVar0)) {
        leftInputVar = inputVar0;
        rightInputVar = inputVar1;
    } else {
        leftInputVar = inputVar1;
        rightInputVar = inputVar0;
    }
    List<LogicalVariable> leftInputPKs = context.findPrimaryKey(leftInputVar);
    List<LogicalVariable> rightInputPKs = context.findPrimaryKey(rightInputVar);
    // Bail if primary keys could not be inferred.
    if (leftInputPKs == null || rightInputPKs == null) {
        return false;
    }
    // primary key has only one variable
    if (leftInputPKs.size() != 1 || rightInputPKs.size() != 1) {
        return false;
    }
    IAType leftType = (IAType) context.getOutputTypeEnvironment(leftInputOp).getVarType(leftInputVar);
    IAType rightType = (IAType) context.getOutputTypeEnvironment(rightInputOp).getVarType(rightInputVar);
    // left-hand side and right-hand side of "~=" has the same type
    IAType left2 = TypeComputeUtils.getActualType(leftType);
    IAType right2 = TypeComputeUtils.getActualType(rightType);
    if (!left2.deepEqual(right2)) {
        return false;
    }
    //
    // -- - FIRE - --
    //
    MetadataProvider metadataProvider = ((MetadataProvider) context.getMetadataProvider());
    FunctionIdentifier funcId = FuzzyUtils.getTokenizer(leftType.getTypeTag());
    String tokenizer;
    if (funcId == null) {
        tokenizer = "";
    } else {
        tokenizer = funcId.getName();
    }
    float simThreshold = FuzzyUtils.getSimThreshold(metadataProvider);
    String simFunction = FuzzyUtils.getSimFunction(metadataProvider);
    // finalize AQL+ query
    String prepareJoin;
    switch(joinOp.getJoinKind()) {
        case INNER:
            {
                prepareJoin = "join" + AQLPLUS;
                break;
            }
        case LEFT_OUTER:
            {
                // other sort of bug.
                return false;
            // prepareJoin = "loj" + AQLPLUS;
            // break;
            }
        default:
            {
                throw new IllegalStateException();
            }
    }
    String aqlPlus = String.format(Locale.US, prepareJoin, tokenizer, tokenizer, simFunction, simThreshold, tokenizer, tokenizer, simFunction, simThreshold, simFunction, simThreshold, simThreshold);
    LogicalVariable leftPKVar = leftInputPKs.get(0);
    LogicalVariable rightPKVar = rightInputPKs.get(0);
    Counter counter = new Counter(context.getVarCounter());
    AQLPlusParser parser = new AQLPlusParser(new StringReader(aqlPlus));
    parser.initScope();
    parser.setVarCounter(counter);
    List<Clause> clauses;
    try {
        clauses = parser.Clauses();
    } catch (ParseException e) {
        throw new AlgebricksException(e);
    }
    // The translator will compile metadata internally. Run this compilation
    // under the same transaction id as the "outer" compilation.
    AqlPlusExpressionToPlanTranslator translator = new AqlPlusExpressionToPlanTranslator(metadataProvider, counter);
    context.setVarCounter(counter.get());
    LogicalOperatorDeepCopyWithNewVariablesVisitor deepCopyVisitor = new LogicalOperatorDeepCopyWithNewVariablesVisitor(context, context);
    translator.addOperatorToMetaScope(new Identifier("#LEFT"), leftInputOp);
    translator.addVariableToMetaScope(new Identifier("$$LEFT"), leftInputVar);
    translator.addVariableToMetaScope(new Identifier("$$LEFTPK"), leftPKVar);
    translator.addOperatorToMetaScope(new Identifier("#RIGHT"), rightInputOp);
    translator.addVariableToMetaScope(new Identifier("$$RIGHT"), rightInputVar);
    translator.addVariableToMetaScope(new Identifier("$$RIGHTPK"), rightPKVar);
    translator.addOperatorToMetaScope(new Identifier("#LEFT_1"), deepCopyVisitor.deepCopy(leftInputOp));
    translator.addVariableToMetaScope(new Identifier("$$LEFT_1"), deepCopyVisitor.varCopy(leftInputVar));
    translator.addVariableToMetaScope(new Identifier("$$LEFTPK_1"), deepCopyVisitor.varCopy(leftPKVar));
    deepCopyVisitor.updatePrimaryKeys(context);
    deepCopyVisitor.reset();
    // translator.addOperatorToMetaScope(new Identifier("#LEFT_2"),
    // deepCopyVisitor.deepCopy(leftInputOp, null));
    // translator.addVariableToMetaScope(new Identifier("$$LEFT_2"),
    // deepCopyVisitor.varCopy(leftInputVar));
    // translator.addVariableToMetaScope(new Identifier("$$LEFTPK_2"),
    // deepCopyVisitor.varCopy(leftPKVar));
    // deepCopyVisitor.updatePrimaryKeys(context);
    // deepCopyVisitor.reset();
    //
    // translator.addOperatorToMetaScope(new Identifier("#LEFT_3"),
    // deepCopyVisitor.deepCopy(leftInputOp, null));
    // translator.addVariableToMetaScope(new Identifier("$$LEFT_3"),
    // deepCopyVisitor.varCopy(leftInputVar));
    // translator.addVariableToMetaScope(new Identifier("$$LEFTPK_3"),
    // deepCopyVisitor.varCopy(leftPKVar));
    // deepCopyVisitor.updatePrimaryKeys(context);
    // deepCopyVisitor.reset();
    translator.addOperatorToMetaScope(new Identifier("#RIGHT_1"), deepCopyVisitor.deepCopy(rightInputOp));
    translator.addVariableToMetaScope(new Identifier("$$RIGHT_1"), deepCopyVisitor.varCopy(rightInputVar));
    translator.addVariableToMetaScope(new Identifier("$$RIGHTPK_1"), deepCopyVisitor.varCopy(rightPKVar));
    deepCopyVisitor.updatePrimaryKeys(context);
    deepCopyVisitor.reset();
    // TODO pick side to run Stage 1, currently always picks RIGHT side
    translator.addOperatorToMetaScope(new Identifier("#RIGHT_2"), deepCopyVisitor.deepCopy(rightInputOp));
    translator.addVariableToMetaScope(new Identifier("$$RIGHT_2"), deepCopyVisitor.varCopy(rightInputVar));
    translator.addVariableToMetaScope(new Identifier("$$RIGHTPK_2"), deepCopyVisitor.varCopy(rightPKVar));
    deepCopyVisitor.updatePrimaryKeys(context);
    deepCopyVisitor.reset();
    translator.addOperatorToMetaScope(new Identifier("#RIGHT_3"), deepCopyVisitor.deepCopy(rightInputOp));
    translator.addVariableToMetaScope(new Identifier("$$RIGHT_3"), deepCopyVisitor.varCopy(rightInputVar));
    translator.addVariableToMetaScope(new Identifier("$$RIGHTPK_3"), deepCopyVisitor.varCopy(rightPKVar));
    deepCopyVisitor.updatePrimaryKeys(context);
    deepCopyVisitor.reset();
    ILogicalPlan plan;
    try {
        plan = translator.translate(clauses);
    } catch (AsterixException e) {
        throw new AlgebricksException(e);
    }
    context.setVarCounter(counter.get());
    ILogicalOperator outputOp = plan.getRoots().get(0).getValue();
    SelectOperator extraSelect = null;
    if (getItemExprRef != expRef) {
        // more than one join condition
        getItemExprRef.setValue(ConstantExpression.TRUE);
        switch(joinOp.getJoinKind()) {
            case INNER:
                {
                    extraSelect = new SelectOperator(expRef, false, null);
                    extraSelect.getInputs().add(new MutableObject<ILogicalOperator>(outputOp));
                    outputOp = extraSelect;
                    break;
                }
            case LEFT_OUTER:
                {
                    if (((AbstractLogicalOperator) outputOp).getOperatorTag() != LogicalOperatorTag.LEFTOUTERJOIN) {
                        throw new IllegalStateException();
                    }
                    LeftOuterJoinOperator topJoin = (LeftOuterJoinOperator) outputOp;
                    topJoin.getCondition().setValue(expRef.getValue());
                    break;
                }
            default:
                {
                    throw new IllegalStateException();
                }
        }
    }
    opRef.setValue(outputOp);
    OperatorPropertiesUtil.typeOpRec(opRef, context);
    return true;
}