GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/13452
[SPARK-15718][SQL] better error message for writing bucketed data
## What changes were proposed in this pull request?
Currently we don't support bucketing for `save` and `insertInto`.
For `save`, we just write the data out into a directory users specified,
and it's not a table, we don't keep its metadata. When we read it back, we have
no idea if the data is bucketed or not, so it doesn't make sense to use `save`
to write bucketed data, as we can't use the bucket information anyway.
We can support it in the future, once we have features like bucket
discovery, or we save bucket information in the data directory too, so that we
don't need to rely on a metastore.
For `insertInto`, it inserts data into an existing table, so it doesn't
make sense to specify bucket information, as we should get the bucket
information from the existing table.
This PR improves the error message for the above 2 cases.
## How was this patch tested?
new test in `BukctedWriteSuite`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark error-msg
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13452.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 #13452
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commit 814ccf618a6bf6a2423019a9a3319a3986e2789b
Author: Wenchen Fan <[email protected]>
Date: 2016-06-01T21:40:35Z
better error message for writing bucketed data
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