GitHub user wzhfy opened a pull request:
https://github.com/apache/spark/pull/16401
[SPARK-18998] [SQL] Add a cbo conf to switch between default statistics and
estimated statistics
## What changes were proposed in this pull request?
We add a cbo configuration to switch between default stats and estimated
stats.
We also define a new statistics method `planStats` in LogicalPlan with conf
as its parameter, in order to pass the cbo switch and other estimation related
configurations in the future. `planStats` is used on the caller sides (i.e.
Optimizer and Strategies) to make transformation decisions based on stats.
## How was this patch tested?
Add a test case using a dummy LogicalPlan.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wzhfy/spark cboSwitch
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16401.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 #16401
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commit 53c1b26e9fc7c253b1654145f910e7881db34de7
Author: Zhenhua Wang <[email protected]>
Date: 2016-12-24T15:43:53Z
add cbo switch
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