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https://issues.apache.org/jira/browse/BEAM-7013?focusedWorklogId=309991&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-309991
]
ASF GitHub Bot logged work on BEAM-7013:
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Author: ASF GitHub Bot
Created on: 10/Sep/19 17:43
Start Date: 10/Sep/19 17:43
Worklog Time Spent: 10m
Work Description: robinyqiu commented on pull request #9519: [BEAM-7013]
Use a 0-length byte array to represent empty sketch in HllCount
URL: https://github.com/apache/beam/pull/9519#discussion_r322876783
##########
File path:
sdks/java/extensions/zetasketch/src/main/java/org/apache/beam/sdk/extensions/zetasketch/HllCount.java
##########
@@ -237,10 +240,11 @@ private Builder(HllCountInitFn<InputT, ?> initFn) {
* PCollection<InputT>} and returns a {@code PCollection<byte[]>} which
consists of the HLL++
* sketch computed from the elements in the input {@code PCollection}.
*
- * <p>Returns an empty output {@code PCollection} if the input {@code
PCollection} is empty.
+ * <p>Returns a singleton {@code PCollection} with an "empty sketch"
(0-length byte array) if
+ * the input {@code PCollection} is empty.
Review comment:
> Or does a perKey aggregation work exactly like a group-by, i.e., it can
never be associated with an empty aggregation?
Yes. (Under the hood it uses a transform called `GroupByKey`.)
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Issue Time Tracking
-------------------
Worklog Id: (was: 309991)
Time Spent: 32h 10m (was: 32h)
> A new count distinct transform based on BigQuery compatible HyperLogLog++
> implementation
> ----------------------------------------------------------------------------------------
>
> Key: BEAM-7013
> URL: https://issues.apache.org/jira/browse/BEAM-7013
> Project: Beam
> Issue Type: New Feature
> Components: extensions-java-sketching, sdk-java-core
> Reporter: Yueyang Qiu
> Assignee: Yueyang Qiu
> Priority: Major
> Fix For: 2.16.0
>
> Time Spent: 32h 10m
> Remaining Estimate: 0h
>
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