GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/12810
[SPARK-15029] improve error message for Generate
## What changes were proposed in this pull request?
This PR improve the error message for `Generate` in 3 cases:
1. generator is nested in expressions, e.g. `SELECT explode(list) + 1 FROM
tbl`
2. generator appears more than one time in SELECT, e.g. `SELECT
explode(list), explode(list) FROM tbl`
3. generator appears in other operator which is not project, e.g. `SELECT *
FROM tbl SORT BY explode(list)`
## How was this patch tested?
new tests in `AnalysisErrorSuite`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark bug
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12810.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 #12810
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commit 22f03029239b119da2c14faf525c660f02d01f72
Author: Wenchen Fan <[email protected]>
Date: 2016-04-30T07:35:45Z
improve error message for Generate
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