[jira] [Closed] (BEAM-2677) AvroIO.read without specifying a schema

["Eugene Kirpichov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-2677?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eugene Kirpichov closed BEAM-2677.
----------------------------------
       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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