GitHub user liancheng opened a pull request:
https://github.com/apache/spark/pull/8988
[SPARK-8848] [SQL] Refactors Parquet write path to follow parquet-format
This PR refactors Parquet write path to follow parquet-format spec. It's a
successor of PR #7679, but with less non-essential changes.
Major changes include:
1. Replaces `RowWriteSupport` and `MutableRowWriteSupport` with
`CatalystWriteSupport`
- Eliminates per value data type dispatching costs via prebuilt
composed writer functions
- Supports legacy mode which is compatible with Parquet format used by
Spark 1.5 and prior versions
The legacy mode is now by default on, and can be turned off by
flipping SQL option `spark.sql.parquet.writeLegacyFormat` to `false`.
1. Cleans up the last pieces of old Parquet support code
As pointed out by @rxin, we probably want to rename all those `Catalyst*`
Parquet classes to `Parquet*` for clarity. But I'd like to do this in a
follow-up PR to minimize code review noises in this one.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liancheng/spark
spark-8848/standard-parquet-write-path
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8988.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 #8988
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commit d1583f88507a32afb509d33313d0cbe02de4897a
Author: Cheng Lian <[email protected]>
Date: 2015-10-05T22:42:44Z
Refactors Parquet write path to follow parquet-format
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