prop.setProperty(Constants.SERIALIZATION_NULL_FORMAT, " ");
String[] colTypes = schema.split("#");
prop.setProperty("columns", colTypes[0]);
prop.setProperty("columns.types", colTypes[1]);
fetchWork fetch = new fetchWork(
ctx.getResFile().toString(),
new tableDesc(LazySimpleSerDe.class, TextInputFormat.class, IgnoreKeyTextOutputFormat.class, prop),
-1
);
fetch.setSerializationNullFormat(" ");
return TaskFactory.get(fetch, this.conf);
}