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https://issues.apache.org/jira/browse/DRILL-6310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16516692#comment-16516692
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ASF GitHub Bot commented on DRILL-6310:
---------------------------------------
ilooner commented on a change in pull request #1324: DRILL-6310: limit batch
size for hash aggregate
URL: https://github.com/apache/drill/pull/1324#discussion_r196300145
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/common/HashTableTemplate.java
##########
@@ -111,6 +111,31 @@
private int resizingTime = 0;
+
+ // Given hashtable index, figure out the corresponding index in the batch.
+ public int idxInBatch(int idx) {
Review comment:
This complexity comes from the heterogenous BatchHolder sizes. Additionally
there is a performance penalty for calculating indexes as the HashTable gets
larger. As my comment above mentions, I don't think there is any benefit to
having different sizes for batch holders. We should compute a reasonable size
based on the first set of input data, and then use the same BatchHolder size
everywhere.
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> limit batch size for hash aggregate
> -----------------------------------
>
> Key: DRILL-6310
> URL: https://issues.apache.org/jira/browse/DRILL-6310
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Flow
> Affects Versions: 1.13.0
> Reporter: Padma Penumarthy
> Assignee: Padma Penumarthy
> Priority: Major
> Fix For: 1.14.0
>
>
> limit batch size for hash aggregate based on memory.
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