GitHub user patrickmcgloin opened a pull request:
https://github.com/apache/spark/pull/20946
[SPARK-23565] [SQL] New error message for structured streaming sources
assertion
## What changes were proposed in this pull request?
A more informative message to tell you why a structured streaming query
cannot continue if you have added more sources, than there are in the existing
checkpoint offsets.
## How was this patch tested?
I added a Unit Test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/patrickmcgloin/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20946.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 #20946
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commit 58576fabf7b3ba93c177c78356bb17492e8b3d80
Author: Patrick McGloin <mcgloin.patrick@...>
Date: 2018-03-30T14:09:25Z
SPARK-23565: Improved error message for when the number of sources for a
query changes
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