Method flatten

basex-core/src/main/java/org/basex/query/expr/Arr.java:132–145

Flattens nested expressions. @param cc compilation context

(final CompileContext cc)

   * @param cc compilation context
   */
  protected final void flatten(final CompileContext cc) {
    // flatten nested expressions
    final ExprList list = new ExprList(exprs.length);
    final Class<? extends Arr> clazz = getClass();
    for(final Expr expr : exprs) {
      if(clazz.isInstance(expr)) {
        list.add(expr.args());
        cc.info(QueryText.OPTFLAT_X_X, expr, (Supplier<?>) this::description);
      } else {
        list.add(expr);
      }
    }
    exprs = list.finish();
  }

  /**
   * Removes empty expressions.