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https://issues.apache.org/jira/browse/DERBY-6117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13609043#comment-13609043
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David Vyvyan commented on DERBY-6117:
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Original forum discussion:
http://apache-database.10148.n7.nabble.com/Limitations-of-Table-Functions-vs-old-VTIs-td127988.html#a127995
> Extend the Table Functions java interface to pass more query context
> information from Derby
> -------------------------------------------------------------------------------------------
>
> Key: DERBY-6117
> URL: https://issues.apache.org/jira/browse/DERBY-6117
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.8.3.0
> Reporter: David Vyvyan
>
> General requirement is to extend the Table Functions java interface (through
> RestrictedVTI or another interface) and pass more context information from
> Derby to Table Functions - esp in query execution phase.
> Greater urgency is required for the first 2 items below, especially the
> ability to access the original SQL which was available with VTIs. This is
> critical to the GaianDB project - we extract HINTs from the query (where we
> pass meta data like user credentials), and also extract full original complex
> predicate expressions (involving functions etc - which cannot be expressed
> with a Restriction) - to push on in our query prorogation...
> In order of importance + simplicity:
> --------------------------------------------------
> 1 - Original SQL (this used to be available with VTIs through VTIEnvironment
> for both compilation and execution phases)
> 2 - Name of function that was called
> 3 - User Info (ID, etc) - (this can currently be passed in the SQL hint)
> 4 - Richer predicate expressions (incl functions, etc)
> 5 - Context within Join query (e.g. inner or outer table, join type)
> 6 - Other Query Plan information
> 7 - Anything else...?
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