[
https://issues.apache.org/jira/browse/SPARK-35003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Dongjoon Hyun resolved SPARK-35003.
-----------------------------------
Fix Version/s: 3.2.0
Resolution: Fixed
Issue resolved by pull request 32104
[https://github.com/apache/spark/pull/32104]
> Improve performance for reading smallint in vectorized Parquet reader
> ---------------------------------------------------------------------
>
> Key: SPARK-35003
> URL: https://issues.apache.org/jira/browse/SPARK-35003
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Chao Sun
> Assignee: Chao Sun
> Priority: Major
> Fix For: 3.2.0
>
>
> Currently {{VectorizedRleValuesReader}} reads short in the following way:
> {code:java}
> for (int i = 0; i < n; i++) {
> c.putShort(rowId + i, (short)data.readInteger());
> }
> {code}
> For PLAIN encoding {{readInteger}} is done via:
> {code:java}
> public final int readInteger() {
> return getBuffer(4).getInt();
> }
> {code}
> which means it needs to repeatedly call {{slice}} buffer which is more
> expensive than calling it once in a big chunk and then reading the ints out.
>
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
