GitHub user lindblombr opened a pull request:
https://github.com/apache/spark/pull/21847
[SPARK-24855][SQL][EXTERNAL][WIP]: Built-in AVRO support should support
specified schema on write
## What changes were proposed in this pull request?
Allows `avroSchema` option to be specified on write, allowing a user to
specify a schema in cases where this is required. A trivial use case is
reading in an avro dataset, making some small adjustment to a column or columns
and writing out using the same schema. Implicit schema creation from SQL
Struct results in a schema that while for the most part, is functionally
similar, is not necessarily compatible.
Allows `fixed` Field type to be utilized for records of specified
`avroSchema`
## How was this patch tested?
Unit tests in AvroSuite are extended to write out included sample datasets
using new `avroSchema` option and verify readability of records. Ideally,
tests should be added for each `Schema.Type` to ensure records are written with
full fidelity.
Please review http://spark.apache.org/contributing.html before opening a
pull request.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/lindblombr/spark specify_schema_on_write
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21847.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 #21847
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commit 30fc1ae98a2c29824b83e956c2cbe87e9bbb3749
Author: Brian Lindblom <blindblom@...>
Date: 2018-07-21T20:43:26Z
SPARK-24855: Built-in AVRO support should support specified schema on write
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