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https://issues.apache.org/jira/browse/KYLIN-6020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928289#comment-17928289
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Guoliang Sun commented on KYLIN-6020:
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h3. Dev Design
There is no priority conflict between `forceToPushDown` in the API and
`forceToPushDown` in the configuration. If either one is `true`, it is
considered as forcing pushdown.
The specific implementation is to override the `isForcedToPushDown` method in
the `SQLRequest` class. If `forceToPushDown` in the project configuration is
`true` or `forceToPushDown` in the request is `true`, the method will return
`true`.
A new system-level configuration item `kylin.query.pushdown-force` is added.
The priority of `forceToPushDown` should be: API > Project > System. The
API-level setting takes precedence. If it is `null`, the project-level and then
the system-level configuration will be checked. The default value for the
system-level configuration is `false`.
The specific implementation is to override the `isForcedToPushDown` method in
the `SQLRequest` class. The parameter type for the API is changed to `Boolean`
to allow a `null` state.
> Add system-level/project-level configuration to allow direct querying of
> internal tables.
> -----------------------------------------------------------------------------------------
>
> Key: KYLIN-6020
> URL: https://issues.apache.org/jira/browse/KYLIN-6020
> Project: Kylin
> Issue Type: Improvement
> Affects Versions: 5.0.0
> Reporter: Guoliang Sun
> Priority: Major
>
> Add a system-level and project-level configuration, defaulting to `false`.
> When enabled, all query requests will directly query internal tables.
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