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https://issues.apache.org/jira/browse/BEAM-2677?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eugene Kirpichov closed BEAM-2677.
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Resolution: Fixed
Fix Version/s: 2.2.0
> AvroIO.read without specifying a schema
> ---------------------------------------
>
> Key: BEAM-2677
> URL: https://issues.apache.org/jira/browse/BEAM-2677
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Eugene Kirpichov
> Assignee: Eugene Kirpichov
> Fix For: 2.2.0
>
>
> Sometimes it is inconvenient to require the user of AvroIO.read/readAll to
> specify a Schema for the Avro files they are reading, especially if different
> files may have different schemas.
> It is possible to read GenericRecord objects from an Avro file, however it is
> not possible to provide a Coder for GenericRecord without knowing the schema:
> a GenericRecord knows its schema so we can encode it into a byte array, but
> we can not decode it from a byte array without knowing the schema (and
> encoding the full schema together with every record would be impractical).
> Instead, a reasonable approach is to treat schemaless GenericRecord as
> unencodable and use the same approach as JdbcIO - a user-specified parse
> callback.
> Suggested API: AvroIO.parseGenericRecords(SerializableFunction<GenericRecord,
> T> parseFn).from(filepattern).
> CC: [~mkhadikov] [~reuvenlax]
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