Method removeDuplicates

fe/src/main/java/org/apache/impala/analysis/Expr.java:1324–1329

Removes duplicate exprs (according to equals()).

(List<C> l)

   * Removes duplicate exprs (according to equals()).
   */
  public static <C extends Expr> void removeDuplicates(List<C> l) {
    if (l == null) return;
    List<C> origList = Lists.newArrayList(l);
    l.clear();
    for (C expr: origList) if (!l.contains(expr)) l.add(expr);
  }

  /**
   * Return a new list without duplicate exprs (according to matches() using cmp).