message: Update sqlite_query_connection.cc
diff: @@ -68,8 +68,8 @@ Status SqliteQueryConnection::GetNext(IteratorContext* ctx,
  Status SqliteQueryConnection::PrepareQuery() {
  TF_RETURN_IF_ERROR(db_->Prepare(query_, &stmt_));
  - size_t column_count = stmt_.ColumnCount();
  - if (column_count != output_types_.size()) {
  + int column_count = stmt_.ColumnCount();
  + if (column_count != static_cast<int>(output_types_.size())) {
  stmt_ = SqliteStatement();
  return errors::InvalidArgument(tensorflow::strings::Printf(
  "The number of columns in query (%d) must match the number of "
  