/**
  * Adds an expression and returns a reference name. If an alias is given, it specifies the alias
  * as an reference name.
  */
 public String addNamedExpr(NamedExpr namedExpr) throws PlanningException {
   if (namedExpr.hasAlias()) {
     return addExpr(namedExpr.getExpr(), namedExpr.getAlias());
   } else {
     return addExpr(namedExpr.getExpr());
   }
 }
Esempio n. 2
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 @Override
 public Expr visitColumnReference(
     ExprNormalizedResult ctx, Stack<Expr> stack, ColumnReferenceExpr expr)
     throws PlanningException {
   // normalize column references.
   if (!expr.hasQualifier()) {
     if (ctx.block.namedExprsMgr.contains(expr.getCanonicalName())) {
       NamedExpr namedExpr = ctx.block.namedExprsMgr.getNamedExpr(expr.getCanonicalName());
       return new ColumnReferenceExpr(namedExpr.getAlias());
     } else {
       String normalized = ctx.plan.getNormalizedColumnName(ctx.block, expr);
       expr.setName(normalized);
     }
   }
   return expr;
 }