GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/17245
[SPARK-19850][SQL] Allow the use of aliases in SQL function calls
## What changes were proposed in this pull request?
We currently cannot use aliases in SQL function calls. This is inconvenient
when you try to create a struct. This SQL query for example `select struct(1,
2) st`, will create a struct with column names `col1` and `col2`. This is even
more problematic when we want to append a field to an existing struct. For
example if we want to a field to struct `st` we would issue the following SQL
query `select struct(st.*, 1) as st from src`, the result will be struct `st`
with an a column with a non descriptive name `col3` (if `st` itself has 2
fields).
This PR proposes to change this by allowing the use of aliased expression
in function parameters. For example `select struct(1 as a, 2 as b) st`, will
create a struct with columns `a` & `b`.
## How was this patch tested?
Added a test to `ExpressionParserSuite` and added a test file for
`SQLQueryTestSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-19850
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17245.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 #17245
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commit 2172c08cb593e148a5223655ba14f2a708e5c3db
Author: Herman van Hovell <[email protected]>
Date: 2017-03-10T16:42:25Z
Allow the use of aliases in SQL function calls.
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