[
https://issues.apache.org/jira/browse/CALCITE-4972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17468285#comment-17468285
]
Mark Grey commented on CALCITE-4972:
------------------------------------
Thanks Julian. Given that javadoc explicitly stated the length of the returned
list to be four, I wanted to confirm my understanding was correct before filing
this as a bug. Changed the issue type and summary per your feedback.
I'd like to have a try at addressing this if you feel there's potential in
either of the approaches described (or something another path I should
explore). Thanks!
> Subfields of array columns containing structs are not qualified in
> getFieldOrigins
> ----------------------------------------------------------------------------------
>
> Key: CALCITE-4972
> URL: https://issues.apache.org/jira/browse/CALCITE-4972
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.28.0
> Reporter: Mark Grey
> Priority: Minor
>
> Attempting to follow on the [suggestions from Julian in this
> thread|https://lists.apache.org/thread/pdpqtzy5mtzlpdbhwghbty6cj0jgc86l],
> found a potential improvement.
> Given a table schema containing a repeated array of structs and a query
> projecting fields of that struct via UNNEST, the present implementation of
> {{getFieldOrigins}} in {{SqlValidatorImpl}} will return a list representation
> suggesting that the subfield is actually a member of the top level table row
> type.
> For example, when using the [DEPT_NESTED table from the
> MockCatalogReaderSimple|https://github.com/apache/calcite/blob/master/testkit/src/main/java/org/apache/calcite/test/catalog/MockCatalogReaderSimple.java#L152-L159]
> within tests with the following query:
> {code:sql}
> select e.empno from dept_nested, unnest(employees) as e
> {code}
> The return value currently is:
> {code:java}
> {CATALOG.SALES.DEPT_NESTED.EMPNO}
> {code}
> Rather than:
> {code:java}
> {CATALOG.SALES.DEPT_NESTED.EMPLOYEES.EMPNO}
> {code}
> No such column {{EMPNO}} exists in the root schema of the DEPT_NESTED table.
> [The javadoc for the method
> |https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql/validate/SqlValidator.java#L717-L728]however
> suggests that the return from this method should always be four entries
> long, although it would seem this doesn't account for nesting. Is this
> intended behavior, or should {{column}} entry of this list be of variable
> length?
--
This message was sent by Atlassian Jira
(v8.20.1#820001)
