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https://issues.apache.org/jira/browse/IGNITE-11125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775200#comment-16775200
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Yury Gerzhedovich commented on IGNITE-11125:
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[~vozerov], Yes, you are right. I've added compatibility test - currently is
fail. Let's discuss how we can do it.
> Use alternative column instead of special _key for indexes.
> -----------------------------------------------------------
>
> Key: IGNITE-11125
> URL: https://issues.apache.org/jira/browse/IGNITE-11125
> Project: Ignite
> Issue Type: Task
> Components: sql
> Reporter: Yury Gerzhedovich
> Assignee: Yury Gerzhedovich
> Priority: Major
> Fix For: 2.8
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently we can have the same columns for sorted inline indexes twice
> because in part cases use alternative columns for another case special column
> _key. To avoid duplicate the same columns need to use alternative columns
> (real columns) always.
>
> For example for
> CREATE TABLE PUBLIC.DFLT_CACHE (ID1 INT, ID2 INT, MY_VAL VARCHAR, PRIMARY KEY
> (ID1 DESC, ID2))
> CREATE INDEX IDX_1 ON PUBLIC.DFLT_CACHE(ID2 DESC, ID1, MY_VAL DESC)
>
> will be use the follow columns ID2 DESC, ID1, MY_VAL DESC, *_KEY* instead
> of ID2 DESC, ID1, MY_VAL DESC
>
>
> The task may be better to do together with
> [IGNITE-11250|https://issues.apache.org/jira/browse/IGNITE-11250], due to,
> seems, both of them required compatibility changes.
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