Method tuples

piglet/src/main/java/org/apache/calcite/piglet/Handler.java:188–196

(
      Ast.ValuesStmt valuesStmt, RelDataType rowType)

  }

  private ImmutableList<ImmutableList<RexLiteral>> tuples(
      Ast.ValuesStmt valuesStmt, RelDataType rowType) {
    final ImmutableList.Builder<ImmutableList<RexLiteral>> listBuilder =
        ImmutableList.builder();
    for (List<Ast.Node> nodeList : valuesStmt.tupleList) {
      listBuilder.add(tuple(nodeList, rowType));
    }
    return listBuilder.build();
  }

  private ImmutableList<RexLiteral> tuple(List<Ast.Node> nodeList,
      RelDataType rowType) {