C implementation requires you to know a file's schema before reading
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Key: AVRO-465
URL: https://issues.apache.org/jira/browse/AVRO-465
Project: Avro
Issue Type: Bug
Components: c
Affects Versions: 1.3.0
Reporter: Jeff Hodges
The C implementation gives the user no way of reading the objects in a data
file without knowing the file's schema ahead of time.
While it does fill in the writers_schema part of the avro_file_reader_t on
read, this field is not available to the API as it is left out of avro.h. Two
options persent itself: 1) preserve the API as is and add a
avro_schema_from_file_reader() function or 2) move the avro_file_reader_t and
avro_file_writer_t structs to avro.h.
A third option, that I don't approve of, is providing a function that reads
from a datafile but uses the writers_schema in the reader given instead of
requiring another schema to be passed into it. This is problematic because
anyone using the API would have fewer debugging and testing options when
dealing with interop datasets. Any problem that occurs might just be the schema
in the file being off, or whatever.
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