[
https://issues.apache.org/jira/browse/HIVE-21313?focusedWorklogId=203533&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-203533
]
ASF GitHub Bot logged work on HIVE-21313:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 25/Feb/19 10:11
Start Date: 25/Feb/19 10:11
Worklog Time Spent: 10m
Work Description: kgyrtkirk commented on pull request #548: HIVE-21313:
Use faster method to prevent copying bytes twice
URL: https://github.com/apache/hive/pull/548#discussion_r259755027
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/VectorAssignRow.java
##########
@@ -452,11 +452,11 @@ private void assignRowColumn(
{
if (object instanceof byte[]) {
byte[] bytes = (byte[]) object;
- ((BytesColumnVector) columnVector).setVal(
+ ((BytesColumnVector) columnVector).setRef(
batchIndex, bytes, 0, bytes.length);
} else {
BytesWritable bw = (BytesWritable) object;
- ((BytesColumnVector) columnVector).setVal(
+ ((BytesColumnVector) columnVector).setRef(
Review comment:
I think writeables are usually reused; don't they?
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Issue Time Tracking
-------------------
Worklog Id: (was: 203533)
Time Spent: 20m (was: 10m)
> Use faster function to point to instead of copy immutable byte arrays
> ---------------------------------------------------------------------
>
> Key: HIVE-21313
> URL: https://issues.apache.org/jira/browse/HIVE-21313
> Project: Hive
> Issue Type: Improvement
> Affects Versions: All Versions
> Reporter: ZhangXin
> Assignee: ZhangXin
> Priority: Minor
> Labels: pull-request-available
> Fix For: All Versions
>
> Attachments: HIVE-21313.patch, HIVE-21313.patch
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> In file ql/src/java/org/apache/hadoop/hive/ql/exec/vector/VectorAssignRow.java
> We may find code like this:
> ```
> Text text = (Text) convertTargetWritable;
> if (text == null)
> { text = new Text(); }
> text.set(string);
> ((BytesColumnVector) columnVector).setVal(
> batchIndex, text.getBytes(), 0, text.getLength());
> ```
>
> Using `setVal` method can copy the bytes array generated by
> `text.getBytes()`. This is totally unnecessary at all. Since the bytes array
> is immutable, we can just use `setRef` method to point to the specific byte
> array, which will also lower the memory usage.
>
> Pull request on Github: https://github.com/apache/hive/pull/548
>
>
>
>
>
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