[
https://issues.apache.org/jira/browse/CALCITE-5268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Julian Hyde updated CALCITE-5268:
---------------------------------
Description:
{{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}
was:
QUALIFY is to Window functions what HAVING is to GROUP BY
For example:
```
SELECT a, b, c, ROW_NUMBER() OVER (PARTITION BY b ORDER BY c) as row_num
FROM t1
QUALIFY row_num = 1
```
Is the same as:
```
SELECT *
FROM (
SELECT a, b, c, ROW_NUMBER() OVER (PARTITION BY b ORDER BY c) as row_num
FROM t1)
WHERE row_num = 1
```
> Add QUALIFY clause
> ------------------
>
> Key: CALCITE-5268
> URL: https://issues.apache.org/jira/browse/CALCITE-5268
> Project: Calcite
> Issue Type: New Feature
> Reporter: Brandon Chong
> Priority: Major
>
> {{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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