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https://issues.apache.org/jira/browse/PHOENIX-6186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17234875#comment-17234875
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ASF GitHub Bot commented on PHOENIX-6186:
-----------------------------------------
gjacoby126 commented on a change in pull request #935:
URL: https://github.com/apache/phoenix/pull/935#discussion_r526307958
##########
File path: phoenix-core/src/main/java/org/apache/phoenix/util/ViewUtil.java
##########
@@ -654,10 +654,17 @@ public static PTable addDerivedColumnsFromParent(PTable
view, PTable parentTable
}
long maxTableTimestamp = view.getTimeStamp();
+ long maxDDLTimestamp = view.getLastDDLTimestamp() != null ?
view.getLastDDLTimestamp() : 0L;
int numPKCols = view.getPKColumns().size();
- // set the final table timestamp as the max timestamp of the view/view
index or its
- // ancestors
+ // set the final table timestamp and DDL timestamp as the respective
max timestamps of the
+ // view/view index or its ancestors
maxTableTimestamp = Math.max(maxTableTimestamp,
parentTable.getTimeStamp());
+ //Diverged views no longer inherit ddl timestamps from their ancestors
because they don't
+ // inherit column changes
Review comment:
@ChinmaySKulkarni - Pushed up a commit that implements Step 1 described
above.
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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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