GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/16281
[SPARK-18860][SQL] Update Parquet to 1.9.0
## What changes were proposed in this pull request?
This PR aims to update Parquet to 1.9.0 and remove the hacks due to Parquet
1.8.1 limitation.
```scala
- // !! HACK ALERT !!
- //
- // PARQUET-363 & PARQUET-278: parquet-mr 1.8.1 doesn't allow
constructing empty GroupType,
- // which prevents us to avoid selecting any columns for queries like
`SELECT COUNT(*) FROM t`.
- // This issue has been fixed in parquet-mr 1.8.2-SNAPSHOT.
- //
- // To workaround this problem, here we first construct a `MessageType`
with a single dummy
- // field, and then remove the field to obtain an empty `MessageType`.
- //
- // TODO Reverts this change after upgrading parquet-mr to 1.8.2+
val EMPTY_MESSAGE = Types
.buildMessage()
- .required(PrimitiveType.PrimitiveTypeName.INT32).named("dummy")
.named(ParquetSchemaConverter.SPARK_PARQUET_SCHEMA_NAME)
- EMPTY_MESSAGE.getFields.clear()
```
## How was this patch tested?
Pass the existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-18860
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16281.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 #16281
----
commit d947a4cbb53751ee9687ac13e1d79b71b6e9e91d
Author: Dongjoon Hyun <[email protected]>
Date: 2016-12-12T21:26:34Z
[SPARK-18860][SQL] Update Parquet to 1.9.0
----
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