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https://issues.apache.org/jira/browse/CALCITE-2194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16392630#comment-16392630
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Piotr Bojko commented on CALCITE-2194:
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Ok, take your time.
For me the most important is whether SqlAccessEnum can be extended or not. With
INDIRECT_SELECT following schema:
{code:json}
{
"name": "HIDDEN_SCHEMA",
"type": "custom",
"factory": "some-factory",
"operand": {},
"access" : {
"factory" : "some-new-factory-for-user-based-access-logic",
"operand" : {
"user01" : "SELECT",
"user02" : "INDIRECT_SELECT"
"user03" : "SELECT, INDIRECT_SELECT"
}
}
}
{code}
* for user01 is forbidden to use it indirect through views from other schemas
* for user02 is hidden and it can access it only though views
* for user03 is open for all selects and views
> Ability to hide a schema
> ------------------------
>
> Key: CALCITE-2194
> URL: https://issues.apache.org/jira/browse/CALCITE-2194
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Affects Versions: 1.16.0
> Reporter: Piotr Bojko
> Assignee: Piotr Bojko
> Priority: Minor
>
> See:
> [https://mail-archives.apache.org/mod_mbox/calcite-dev/201711.mbox/ajax/%3C6F6E52D4-6860-4384-A1CB-A2301D05394D%40apache.org%3E]
> I've looked into the core and the notion of an user could be hard to achieved
> now.
> Though, I am able to implement the "hidden schema" feature through following
> changes:
> # JsonSchema - add a holder for the feature, boolean flag or flags field
> with enum (CACHED which now exists as a separate flag - some deprecation
> could be needed, HIDDEN)
> # CalciteSchema - pass through of a flag
> # RelOptSchema - pass through of a flag
> # CalciteCatalogReader - pass through of a flag
> # Other derivatives of RelOptSchema - mocked value, false
> # RelOptTable and impl - pass through of a flag
> # SqlValidatorImpl - validation whether object from hidden schema is used
> (in the same places like validateAccess)
> # ViewTableMacro.apply -> Schemas.analyzeView ->
> CalcitePrepareImpl.analyzeView -> CalcitePrepareImpl.parse_ ->
> CalcitePrepareImpl.CalcitePrepareImpl - this path of execution should build
> SqlValidatorImpl which has the check from point 7 disabled-
> Such feature could be useful for end users.
> If the solution is ok - I can contribute it.
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