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https://issues.apache.org/jira/browse/PHOENIX-6045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17165959#comment-17165959
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Lars Hofhansl commented on PHOENIX-6045:
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Sorry for my verbose thought process here. But actually here's and interesting 
question: For mutable tables, why does VAL2 need to be selected for the DELETE 
(as the code does)?

Couldn't the select also be just: {{SELECT "PKEY1","PKEY2" FROM TABLE1 WHERE 
VAL1 = '000000000000000'}}, then knowing the PK(s) from the index, delete the 
rows on the server? The server can read back the existing row and now has all 
the information to delete these other index entries. Perhaps the reading back 
is deemed to expensive...?


> Delete that should qualify for index path does not use index when multiple 
> indexes are available.
> -------------------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-6045
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-6045
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 5.0.0, 4.15.0, 4.14.3
>            Reporter: Daniel Wong
>            Priority: Major
>             Fix For: 5.1.0, 4.16.0
>
>         Attachments: MultipleDeleteReproIT.java
>
>
> Delete that should qualify for index path does not use index when multiple 
> indexes are available.  Test case to reproduce will be below.



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