GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/19286
[SPARK-21338][SQL][FOLLOW-UP] Implement isCascadingTruncateTable() method
in AggregatedDialect
## What changes were proposed in this pull request?
The implemented `isCascadingTruncateTable` in `AggregatedDialect` is wrong.
When no dialect claims cascading, once there is an unknown cascading truncate
in the dialects, we should return unknown cascading, instead of false.
## How was this patch tested?
Added test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 SPARK-21338-followup
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19286.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 #19286
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commit 803b1961a34d4d9f4c8ebcbe5544dd23fbaa720a
Author: Liang-Chi Hsieh <vii...@gmail.com>
Date: 2017-09-20T04:52:08Z
Fix isCascadingTruncateTable for AggregatedDialect.
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