GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/13439
[SPARK-15701][SQL] Constant ColumnVector only needs to prepare one capacity
## What changes were proposed in this pull request?
`ColumnVector` has a variable to mark it is a constant `ColumnVector` or
not. However, we still let constant `ColumnVector` prepare the space needed for
all its capacity. Actually because constant `ColumnVector` only has one
distinct value. It only needs to prepare one capacity. This can reduce its
memory usage and speed up data access.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 constant-column-vector
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13439.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 #13439
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commit 721d53ace9354b70e8b9c6decca0fb3b13c12426
Author: Liang-Chi Hsieh <[email protected]>
Date: 2016-06-01T14:39:56Z
Support constant column vector.
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