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https://issues.apache.org/jira/browse/BEAM-2677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16099182#comment-16099182
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ASF GitHub Bot commented on BEAM-2677:
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GitHub user jkff opened a pull request:
https://github.com/apache/beam/pull/3632
[BEAM-2677] AvroIO.parseGenericRecords - schemaless AvroIO.read
To be done properly, this PR needs https://github.com/apache/beam/pull/3549.
R: @mairbek CC: @reuvenlax (please take a look at the API but hold off a
full review until that PR is submitted)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jkff/incubator-beam avroio-dynamic
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/beam/pull/3632.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3632
----
commit 8bcafd94a38d9ccb962acd809536ff4bfcf70036
Author: Eugene Kirpichov <[email protected]>
Date: 2017-07-24T22:07:15Z
[BEAM-2677] AvroIO.parseGenericRecords - schemaless AvroIO.read
----
> 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
>
> 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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