GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/16351
[SPARK-18943][SQL] Avoid per-record type dispatch in CSV when reading
## What changes were proposed in this pull request?
`CSVRelation.csvParser` does type dispatch for each value in each row. We
can prevent this because the schema is already kept in `CSVRelation`.
So, this PR proposes that converters are created first according to the
schema, and then apply them to each.
## How was this patch tested?
Tests in `CSVTypeCastSuite` and `CSVRelation`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark type-dispatch
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16351.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 #16351
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commit e72d1bc419dfd6da7f6e298d5b5412dba69eb5ad
Author: hyukjinkwon <[email protected]>
Date: 2016-12-20T11:54:05Z
Avoid per-record type dispatch in CSV when reading
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