Method emptyExpr

basex-core/src/main/java/org/basex/query/expr/Arr.java:167–173

Returns the first expression that yields an empty sequence. If all expressions return non-empty results, the original expression is returned. @return empty or original expression

()

   * @return empty or original expression
   */
  final Expr emptyExpr() {
    // pre-evaluate if one value is empty (e.g.: () = local:expensive() )
    for(final Expr expr : exprs) {
      if(expr.seqType().zero()) return expr;
    }
    return this;
  }

  /**
   * Tries to merge consecutive EBV tests.