GitHub user jiangxb1987 opened a pull request:
https://github.com/apache/spark/pull/16057
[SPARK-18624][SQL] Implicit cast complex types
## What changes were proposed in this pull request?
Currently `ImplicitTypeCasts` doesn't handle casts between `ArrayType`s,
this is not convenient, we should add a rule to enable casting from
`ArrayType(InternalType)` to `ArrayType(newInternalType)`.
Goals:
1. Add a rule to `ImplicitTypeCasts` to enable casting between `ArrayType`s;
2. Simplify `Percentile` and `ApproximatePercentile`.
## How was this patch tested?
Updated test cases in `TypeCoercionSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jiangxb1987/spark implicit-cast-complex-types
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16057.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 #16057
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commit e4610109f7b0559863122c8d01d470b08d462f86
Author: jiangxingbo <jiangxb1...@gmail.com>
Date: 2016-11-29T09:42:39Z
Support implict type casts between ArrayTypes.
commit 374b4f82bb59ef4ea3279c22dd6e9cd22f710ec9
Author: jiangxingbo <jiangxb1...@gmail.com>
Date: 2016-11-29T10:10:55Z
update Percentile and ApproximatePercentile.
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