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

Example 11 with LiteralExpr

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

the class AbstractSqlppExpressionScopingVisitor method wrapWithResolveFunction.

// Rewrites for an undefined variable reference, which potentially could be a syntatic sugar.
protected Expression wrapWithResolveFunction(VariableExpr expr, Set<VariableExpr> liveVars) throws CompilationException {
    List<Expression> argList = new ArrayList<>();
    //Ignore the parser-generated prefix "$" for a dataset.
    String varName = SqlppVariableUtil.toUserDefinedVariableName(expr.getVar().getValue()).getValue();
    argList.add(new LiteralExpr(new StringLiteral(varName)));
    argList.addAll(liveVars);
    return new CallExpr(resolveFunction, argList);
}

Example 12 with LiteralExpr

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

the class VariableCheckAndRewriteVisitor method wrapWithDatasetFunction.

private Expression wrapWithDatasetFunction(String dataverseName, String datasetName) throws CompilationException {
    String fullyQualifiedName = dataverseName == null ? datasetName : dataverseName + "." + datasetName;
    List<Expression> argList = new ArrayList<>();
    argList.add(new LiteralExpr(new StringLiteral(fullyQualifiedName)));
    return new CallExpr(datasetFunction, argList);
}

Example 13 with LiteralExpr

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

the class SqlppBuiltinFunctionRewriteVisitor method normalizeCaseExpr.

// Normalizes WHEN expressions so that it can have correct NULL/MISSING semantics as well
// as type promotion semantics.
private CaseExpression normalizeCaseExpr(CaseExpression caseExpr) throws CompilationException {
    LiteralExpr trueLiteral = new LiteralExpr(TrueLiteral.INSTANCE);
    Expression conditionExpr = caseExpr.getConditionExpr();
    if (trueLiteral.equals(conditionExpr)) {
        return caseExpr;
    }
    List<Expression> normalizedWhenExprs = new ArrayList<>();
    for (Expression expr : caseExpr.getWhenExprs()) {
        OperatorExpr operatorExpr = new OperatorExpr();
        operatorExpr.addOperand((Expression) SqlppRewriteUtil.deepCopy(expr));
        operatorExpr.addOperand(caseExpr.getConditionExpr());
        operatorExpr.addOperator("=");
        normalizedWhenExprs.add(operatorExpr);
    }
    return new CaseExpression(trueLiteral, normalizedWhenExprs, caseExpr.getThenExprs(), caseExpr.getElseExpr());
}