private static String[] getOutputFormatAliases(JobContext context) {
    return context.getConfiguration().getStrings(MO_ALIASES);
  }
Write the output key and value using the OutputFormat defined by the
alias.

@param alias the name given to the OutputFormat configuration
@param key the output key to be written
@param value the output value to be written
@param context the Mapper or Reducer Context
@throws IOException
@throws InterruptedException
hcatalog/core/src/main/java/org/apache/hive/hcatalog/mapreduce/MultiOutputFormat.java