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https://issues.apache.org/jira/browse/CALCITE-5268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17635426#comment-17635426
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Brandon Chong commented on CALCITE-5268:
----------------------------------------
Thank you for the kind words and support :) I am very excited to work on this!
* I added SqlParserTests
* Added SqlValidatorTests
** For now we do not support ordinals in QUALIFY
** The code for ambiguous columns works in QUALIFY and rejects deptno without
emp or dept prefix
** Non boolean expressions throw an error
** I added a check to make sure the the expression is a window function
** Can you give me an example of "applying windowed aggregate functions to
aggregate functions"?
** Mixing windowed and non windowed aggregates causes the query to fail
* I added a test for Correlated Subqueries in SqlToRelConverter
* Added a qualify.iq
* Updated reference.md
Please let me know anything else you would like to see :)
> Add QUALIFY clause
> ------------------
>
> Key: CALCITE-5268
> URL: https://issues.apache.org/jira/browse/CALCITE-5268
> Project: Calcite
> Issue Type: New Feature
> Reporter: Brandon Chong
> Assignee: Brandon Chong
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {{QUALIFY}} is to Window functions what {{HAVING}} is to {{GROUP BY}}.
> For example:
> {code}
> SELECT a, b, c, ROW_NUMBER() OVER (PARTITION BY b ORDER BY c) as row_num
> FROM t1
> QUALIFY row_num = 1
> {code}
> Is the same as:
> {code}
> SELECT *
> FROM (
> SELECT a, b, c, ROW_NUMBER() OVER (PARTITION BY b ORDER BY c) as row_num
> FROM t1)
> WHERE row_num = 1
> {code}
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