[jira] [Commented] (CASSANDRA-8721) expose "shadowed" columns in tracing output

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-8721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14302073#comment-14302073 ] 

Jonathan Ellis commented on CASSANDRA-8721:
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Tracing already tells you how many sstables it needs to open.  I'm not sure that adding cell level detail gives me useful enough information to push tracing into the cell merging logic.

> expose "shadowed" columns in tracing output
> -------------------------------------------
>
>                 Key: CASSANDRA-8721
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8721
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Robert Coli
>            Priority: Trivial
>
> Current tracing messages expose how many tombstones are read in order to read live columns, but they do not expose shadowed columns. Shadowed columns are columns where the timestamp for a given column is lower than the highest timestamp for that column.
> It would be useful for users who are tracing queries to understand how many shadowed columns are being read-than-ignored.



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