Examples with LiteralExpr org.apache.asterix.lang.common.expression.LiteralExpr used on opensource projects

Example 1 with LiteralExpr

use of org.apache.asterix.lang.common.expression.LiteralExpr in project asterixdb by apache.

the class InlineColumnAliasVisitor method mapRecordConstructor.

private Map<Expression, Expression> mapRecordConstructor(RecordConstructor rc) {
    Map<Expression, Expression> exprMap = new HashMap<>();
    for (FieldBinding binding : rc.getFbList()) {
        Expression leftExpr = binding.getLeftExpr();
        // (e.g., foo.name AS name) in regular SQL SELECT.
        if (leftExpr.getKind() != Kind.LITERAL_EXPRESSION) {
            continue;
        }
        LiteralExpr literalExpr = (LiteralExpr) leftExpr;
        if (literalExpr.getValue().getLiteralType() == Literal.Type.STRING) {
            String fieldName = SqlppVariableUtil.toInternalVariableName(literalExpr.getValue().getStringValue());
            exprMap.put(new VariableExpr(new VarIdentifier(fieldName)), binding.getRightExpr());
        }
    }
    return exprMap;
}

Example 2 with LiteralExpr

use of org.apache.asterix.lang.common.expression.LiteralExpr in project asterixdb by apache.

the class LangRecordParseUtil method exprToStringLiteral.

public static Literal exprToStringLiteral(Expression expr) throws HyracksDataException {
    if (expr.getKind() != Expression.Kind.LITERAL_EXPRESSION) {
        throw new HyracksDataException(ErrorCode.ASTERIX, ErrorCode.PARSE_ERROR, "Expected expression can only be of type %1$s", Expression.Kind.LITERAL_EXPRESSION);
    }
    LiteralExpr keyLiteralExpr = (LiteralExpr) expr;
    Literal keyLiteral = keyLiteralExpr.getValue();
    if (keyLiteral.getLiteralType() != Literal.Type.STRING) {
        throw new HyracksDataException(ErrorCode.ASTERIX, ErrorCode.PARSE_ERROR, "Expected Literal can only be of type %1$s", Literal.Type.STRING);
    }
    return keyLiteral;
}

Example 3 with LiteralExpr

use of org.apache.asterix.lang.common.expression.LiteralExpr in project asterixdb by apache.

the class SqlppDeleteRewriteVisitor method visit.

@Override
public Void visit(DeleteStatement deleteStmt, Void visitArg) {
    List<Expression> arguments = new ArrayList<>();
    Identifier dataverseName = deleteStmt.getDataverseName();
    Identifier datasetName = deleteStmt.getDatasetName();
    String arg = dataverseName == null ? datasetName.getValue() : dataverseName.getValue() + "." + datasetName.getValue();
    LiteralExpr argumentLiteral = new LiteralExpr(new StringLiteral(arg));
    arguments.add(argumentLiteral);
    CallExpr callExpression = new CallExpr(new FunctionSignature(FunctionConstants.ASTERIX_NS, "dataset", 1), arguments);
    // From clause.
    VariableExpr var = deleteStmt.getVariableExpr();
    FromTerm fromTerm = new FromTerm(callExpression, var, null, null);
    @SuppressWarnings("unchecked") FromClause fromClause = new FromClause(Collections.singletonList(fromTerm));
    // Where clause.
    WhereClause whereClause = null;
    Expression condition = deleteStmt.getCondition();
    if (condition != null) {
        whereClause = new WhereClause(condition);
    }
    // Select clause.
    VariableExpr returnExpr = new VariableExpr(var.getVar());
    returnExpr.setIsNewVar(false);
    SelectElement selectElement = new SelectElement(returnExpr);
    SelectClause selectClause = new SelectClause(selectElement, null, false);
    // Construct the select expression.
    SelectBlock selectBlock = new SelectBlock(selectClause, fromClause, null, whereClause, null, null, null);
    SelectSetOperation selectSetOperation = new SelectSetOperation(new SetOperationInput(selectBlock, null), null);
    SelectExpression selectExpression = new SelectExpression(null, selectSetOperation, null, null, false);
    Query query = new Query(false, false, selectExpression, 0);
    query.setBody(selectExpression);
    // return the delete statement.
    deleteStmt.setQuery(query);
    return null;
}

Example 4 with LiteralExpr

use of org.apache.asterix.lang.common.expression.LiteralExpr in project asterixdb by apache.

the class LangExpressionToPlanTranslator method visit.

@Override
public Pair<ILogicalOperator, LogicalVariable> visit(CallExpr fcall, Mutable<ILogicalOperator> tupSource) throws CompilationException {
    LogicalVariable v = context.newVar();
    FunctionSignature signature = fcall.getFunctionSignature();
    List<Mutable<ILogicalExpression>> args = new ArrayList<>();
    Mutable<ILogicalOperator> topOp = tupSource;
    for (Expression expr : fcall.getExprList()) {
        switch(expr.getKind()) {
            case VARIABLE_EXPRESSION:
                LogicalVariable var = context.getVar(((VariableExpr) expr).getVar().getId());
                args.add(new MutableObject<>(new VariableReferenceExpression(var)));
                break;
            case LITERAL_EXPRESSION:
                LiteralExpr val = (LiteralExpr) expr;
                args.add(new MutableObject<>(new ConstantExpression(new AsterixConstantValue(ConstantHelper.objectFromLiteral(val.getValue())))));
                break;
            default:
                Pair<ILogicalExpression, Mutable<ILogicalOperator>> eo = langExprToAlgExpression(expr, topOp);
                AbstractLogicalOperator o1 = (AbstractLogicalOperator) eo.second.getValue();
                args.add(new MutableObject<>(eo.first));
                if (o1 != null && !(o1.getOperatorTag() == LogicalOperatorTag.ASSIGN && hasOnlyChild(o1, topOp))) {
                    topOp = eo.second;
                }
                break;
        }
    }
    AbstractFunctionCallExpression f;
    if ((f = lookupUserDefinedFunction(signature, args)) == null) {
        f = lookupBuiltinFunction(signature.getName(), signature.getArity(), args);
    }
    if (f == null) {
        throw new CompilationException(" Unknown function " + signature.getName() + "@" + signature.getArity());
    }
    // Put hints into function call expr.
    if (fcall.hasHints()) {
        for (IExpressionAnnotation hint : fcall.getHints()) {
            f.getAnnotations().put(hint, hint);
        }
    }
    AssignOperator op = new AssignOperator(v, new MutableObject<>(f));
    if (topOp != null) {
        op.getInputs().add(topOp);
    }
    return new Pair<>(op, v);
}

Example 5 with LiteralExpr

use of org.apache.asterix.lang.common.expression.LiteralExpr in project asterixdb by apache.

the class LangExpressionToPlanTranslator method langExprToAlgExpression.

protected Pair<ILogicalExpression, Mutable<ILogicalOperator>> langExprToAlgExpression(Expression expr, Mutable<ILogicalOperator> topOpRef) throws CompilationException {
    switch(expr.getKind()) {
        case VARIABLE_EXPRESSION:
            VariableReferenceExpression ve = new VariableReferenceExpression(context.getVar(((VariableExpr) expr).getVar().getId()));
            return new Pair<>(ve, topOpRef);
        case LITERAL_EXPRESSION:
            LiteralExpr val = (LiteralExpr) expr;
            return new Pair<>(new ConstantExpression(new AsterixConstantValue(ConstantHelper.objectFromLiteral(val.getValue()))), topOpRef);
        default:
            if (expressionNeedsNoNesting(expr)) {
                Pair<ILogicalOperator, LogicalVariable> p = expr.accept(this, topOpRef);
                ILogicalExpression exp = ((AssignOperator) p.first).getExpressions().get(0).getValue();
                return new Pair<>(exp, p.first.getInputs().get(0));
            } else {
                Mutable<ILogicalOperator> srcRef = new MutableObject<>();
                Pair<ILogicalOperator, LogicalVariable> p = expr.accept(this, srcRef);
                if (p.first.getOperatorTag() == LogicalOperatorTag.SUBPLAN) {
                    if (topOpRef.getValue() != null) {
                        srcRef.setValue(topOpRef.getValue());
                    } else {
                        // Re-binds the bottom operator reference to {@code topOpRef}.
                        rebindBottomOpRef(p.first, srcRef, topOpRef);
                    }
                    Mutable<ILogicalOperator> top2 = new MutableObject<>(p.first);
                    return new Pair<>(new VariableReferenceExpression(p.second), top2);
                } else {
                    SubplanOperator s = new SubplanOperator();
                    s.getInputs().add(topOpRef);
                    srcRef.setValue(new NestedTupleSourceOperator(new MutableObject<>(s)));
                    Mutable<ILogicalOperator> planRoot = new MutableObject<>(p.first);
                    s.setRootOp(planRoot);
                    return new Pair<>(new VariableReferenceExpression(p.second), new MutableObject<>(s));
                }
            }
    }
}