public static String changeStoreName(String tableName, String separator) {
    return tableName + separator + MixedTable.CHANGE_STORE_IDENTIFIER + separator;
  }
Generate change store table name for mixed format tables.

@param tableName mixed format table name.
@param separator change store separator.
@return change store table name.
amoro-format-iceberg/src/main/java/org/apache/amoro/utils/MixedTableUtil.java