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Pig >> mail # user >> schema string in python UDF

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schema string in python UDF
Small question—the python UDF doc says that "variable names inside a schema string are not used anywhere, they just make the syntax identifiable to the parser"  (https://pig.apache.org/docs/r0.9.0/udf.html#schemafunction).  However, it looks like pig is picking up those field names and keeping them if I don't override them.

For instance if I have a python UDF:

def my_udf(x):
    return 123

And a pig script:

raw = LOAD 'data.txt' USING PigStorage() AS (x:int);
with_udf = FOREACH raw GENERATE my_udfs.my_udf(x);

Running describe on with_udf gives me:

with_udf: {a: int}

Is the doc incorrect there?