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https://issues.apache.org/jira/browse/PHOENIX-6186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17221605#comment-17221605
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ASF GitHub Bot commented on PHOENIX-6186:
-----------------------------------------
ChinmaySKulkarni commented on a change in pull request #935:
URL: https://github.com/apache/phoenix/pull/935#discussion_r512895873
##########
File path:
phoenix-core/src/main/java/org/apache/phoenix/coprocessor/AddColumnMutator.java
##########
@@ -399,6 +399,10 @@ public MetaDataMutationResult
validateAndAddMetadata(PTable table, byte[][] rowK
rowKeyMetaData[TABLE_NAME_INDEX])));
}
}
+ //We're changing the application-facing schema by adding a column, so
update the DDL
+ // timestamp
+
additionalTableMetadataMutations.add(MetaDataUtil.getLastDDLTimestampUpdate(tableHeaderRowKey,
Review comment:
Yes, thanks.
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> Store table metadata last modified timestamp in PTable / System.Catalog
> -----------------------------------------------------------------------
>
> Key: PHOENIX-6186
> URL: https://issues.apache.org/jira/browse/PHOENIX-6186
> Project: Phoenix
> Issue Type: New Feature
> Reporter: Geoffrey Jacoby
> Assignee: Geoffrey Jacoby
> Priority: Major
> Fix For: 4.16.0
>
> Attachments: PHOENIX-6186-4.x.patch
>
>
> There are many reasons why it's useful to know when a particular table's
> metadata was last modified. It's helpful when solving cache coherency
> problems, and also in order to interact with external schema registries which
> may have multiple versions of a particular schema and require a timestamp to
> resolve ambiguities.
> This JIRA will add a last modified timestamp field to System.Catalog, to be
> updated both when creating a table/view and also when adding or removing a
> column. Changing purely internal Phoenix properties will not update the
> timestamp.
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