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https://issues.apache.org/jira/browse/CALCITE-2194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16377388#comment-16377388
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Julian Hyde commented on CALCITE-2194:
--------------------------------------
Existing code:
* [class
SqlAccessType|https://calcite.apache.org/apidocs/org/apache/calcite/sql/SqlAccessType.html]
(could become an enum)
* [method
SqlValidatorTable.getAllowedAccess|https://calcite.apache.org/apidocs/org/apache/calcite/sql/validate/SqlValidatorTable.html#getAllowedAccess--]
(also inherited by {{RelOptTableImpl}})
> 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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