GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/17646
[SPARK-20349] [SQL] ListFunctions returns duplicate functions after using
persistent functions
### What changes were proposed in this pull request?
The session catalog caches some persistent functions in the
`FunctionRegistry`, so there can be duplicates. Our Catalog API `listFunctions`
does not handle it.
It would be better if `SessionCatalog` API can de-duplciate the records,
instead of doing it by each API caller. In `FunctionRegistry`, our functions
are identified by the unquoted string. Thus, this PR is try to parse it using
our parser interface and then de-duplicate the names.
### How was this patch tested?
Added test cases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark showFunctions
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17646.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 #17646
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commit 7e26e5a00368977bdd6ef337169c9de8b25d6c58
Author: Xiao Li <gatorsm...@gmail.com>
Date: 2017-04-16T07:24:44Z
fix.
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