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https://issues.apache.org/jira/browse/BEAM-8456?focusedWorklogId=334293&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-334293
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ASF GitHub Bot logged work on BEAM-8456:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 25/Oct/19 18:37
            Start Date: 25/Oct/19 18:37
    Worklog Time Spent: 10m 
      Work Description: kennknowles commented on pull request #9849: 
[BEAM-8456] Add pipeline option to have Data Catalog truncate sub-millisecond 
precision
URL: https://github.com/apache/beam/pull/9849#discussion_r339182223
 
 

 ##########
 File path: 
sdks/java/extensions/sql/datacatalog/src/main/java/org/apache/beam/sdk/extensions/sql/meta/provider/datacatalog/DataCatalogPipelineOptions.java
 ##########
 @@ -32,4 +32,12 @@
   String getDataCatalogEndpoint();
 
   void setDataCatalogEndpoint(String dataCatalogEndpoint);
+
+  /** Whether to truncate timestamps in tables described by Data Catalog. */
+  @Description("Truncate sub-millisecond precision timestamps in tables 
described by Data Catalog")
+  @Validation.Required
+  @Default.Boolean(false)
+  Boolean getTruncateTimestamps();
 
 Review comment:
   It does work without boxing. Great.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 334293)
    Time Spent: 2h 50m  (was: 2h 40m)

> BigQuery to Beam SQL timestamp has the wrong default: truncation makes the 
> most sense
> -------------------------------------------------------------------------------------
>
>                 Key: BEAM-8456
>                 URL: https://issues.apache.org/jira/browse/BEAM-8456
>             Project: Beam
>          Issue Type: Improvement
>          Components: dsl-sql
>            Reporter: Kenneth Knowles
>            Assignee: Kenneth Knowles
>            Priority: Major
>          Time Spent: 2h 50m
>  Remaining Estimate: 0h
>
> Most of the time, a user reading a timestamp from BigQuery with 
> higher-than-millisecond precision timestamps may not even realize that the 
> data source created these high precision timestamps. They are probably 
> timestamps on log entries generated by a system with higher precision.
> If they are using it with Beam SQL, which only supports millisecond 
> precision, it makes sense to "just work" by default.



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