Method bag

piglet/src/main/java/org/apache/calcite/piglet/Handler.java:211–219

(List<Ast.Node> nodeList,
      RelDataType type)

  }

  private ImmutableList<RexLiteral> bag(List<Ast.Node> nodeList,
      RelDataType type) {
    final ImmutableList.Builder<RexLiteral> listBuilder =
        ImmutableList.builder();
    for (Ast.Node node : nodeList) {
      listBuilder.add(item(node, type.getComponentType()));
    }
    return listBuilder.build();
  }

  private RexLiteral item(Ast.Node node, RelDataType type) {
    final RexBuilder rexBuilder = builder.getRexBuilder();