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https://issues.apache.org/jira/browse/BEAM-10655?focusedWorklogId=658116&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-658116
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ASF GitHub Bot logged work on BEAM-10655:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 30/Sep/21 06:42
            Start Date: 30/Sep/21 06:42
    Worklog Time Spent: 10m 
      Work Description: blackhogz commented on a change in pull request #15485:
URL: https://github.com/apache/beam/pull/15485#discussion_r719102764



##########
File path: 
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryUtils.java
##########
@@ -551,9 +548,9 @@ public static TableRow toTableRow(Row row) {
         return toTableRow((Row) fieldValue);
 
       case DATETIME:
-        return ((Instant) fieldValue)
-            .toDateTime(DateTimeZone.UTC)
-            .toString(BIGQUERY_TIMESTAMP_PRINTER);
+        org.joda.time.Instant jodaInstant = (org.joda.time.Instant) fieldValue;
+        java.time.Instant javaInstant = 
java.time.Instant.ofEpochMilli(jodaInstant.getMillis());
+        return BIGQUERY_TIMESTAMP_PRINTER.format(javaInstant);

Review comment:
       Got it. IIUC, this means we should not error out in 
`BigQueryUtils.toTableSchema()` but rather check the flag and error out case by 
case in `BigQueryUtils.toTableRow()` similar to the snippet you linked.
   
   I think @amuletxheart and I will have to defer the re-architecting work to 
the maintainers who definitely have a much better understanding of the overall 
architecture than us, even though I agree passing an argument to `toTableRow()` 
is a bit messy.
   
   That said, are you okay with the proposed 
`BigQueryIO.Write#allowTruncatedTimestamps()` change, as I think this is kinda 
part of the "public API" of the BigQueryIO, while `toTableRow()` is an private 
implementation that is easier to change when we later undergo the 
re-architecturing work.




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 658116)
    Time Spent: 3.5h  (was: 3h 20m)

> Cannot write "google.protobuf.Timestamp" (NanosInstant) to BigQuery through 
> schemas
> -----------------------------------------------------------------------------------
>
>                 Key: BEAM-10655
>                 URL: https://issues.apache.org/jira/browse/BEAM-10655
>             Project: Beam
>          Issue Type: Improvement
>          Components: io-java-gcp
>            Reporter: Chamikara Madhusanka Jayalath
>            Assignee: Xinshen Yong
>            Priority: P2
>              Labels: starter
>          Time Spent: 3.5h
>  Remaining Estimate: 0h
>
> See here for details and instructions for reproducing.
> [https://lists.apache.org/thread.html/r1657ccf41dda3f2d9d082c5ebb006dd2da92863983971ad23485f16e%40%3Cdev.beam.apache.org%3E]



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