GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/15723
[SPARK-18214][SQL] Simplify RuntimeReplaceable type coercion
## What changes were proposed in this pull request?
RuntimeReplaceable is used to create aliases for expressions, but the way
it deals with type coercion is pretty weird (each expression is responsible for
how to handle type coercion, which does not obey the normal implicit type cast
rules).
This patch simplifies its handling by allowing the analyzer to traverse
into the actual expression of a RuntimeReplaceable.
## How was this patch tested?
- Correctness should be guaranteed by existing unit tests already
- Removed SQLCompatibilityFunctionSuite and moved it
sql-compatibility-functions.sql
- Added a new test case in sql-compatibility-functions.sql for verifying
explain behavior.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark SPARK-18214
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15723.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 #15723
----
commit 8cdf56c1191a7fa3a4a567b92c11e1617d0f4f0e
Author: Reynold Xin <r...@databricks.com>
Date: 2016-11-02T00:33:35Z
[SPARK-18214][SQL] Simplify RuntimeReplaceable type coercion
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