GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/20316
[SPARK-23149][SQL] polish ColumnarBatch
## What changes were proposed in this pull request?
Several cleanups in `ColumnarBatch`
* remove `schema`. The `ColumnVector`s inside `ColumnarBatch` already have
the data type information, we don't need this `schema`.
* remove `capacity`. `ColumnarBatch` is just a wrapper of `ColumnVector`s,
not builders, it doesn't need a capacity property.
* remove `DEFAULT_BATCH_SIZE`. As a wrapper, `ColumnarBatch` can't decide
the batch size, it should be decided by the reader, e.g. parquet reader, orc
reader, cached table reader.
## How was this patch tested?
existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark columnar-batch
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20316.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 #20316
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commit 669948305fbf87420c0458e3701902c0f1f78205
Author: Wenchen Fan <wenchen@...>
Date: 2018-01-18T14:58:03Z
polish ColumnarBatch
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