Dian Fu commented on CALCITE-1911:

[~julianhyde], [~ransom] Thanks a lot for your review.
I am surprised that you needed to add so much code for intervals in 
SqlParserUtil, and indeed in reference.md. Were you not able to re-use existing 
interval literal support?
I have tried to reuse existing code, but didn't found any existing code to 
transform from {{RexLiteral}} of type {{INTERVAL_YEAR_MONTH}} or 
{{INTERVAL_DAY_TIME}} to {{SqlIntervalLiteral}}. I will investigate how this is 
done for the existing literal support.

> Support WITHIN clause in MATCH_RECOGNIZE
> ----------------------------------------
>                 Key: CALCITE-1911
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1911
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Dian Fu
>            Assignee: Julian Hyde
>              Labels: match
> Window is an important feature for pattern detection, it defines the time 
> duration for the events to match a pattern. Here is an example from 
> [doc|https://docs.oracle.com/middleware/1213/eventprocessing/cql-reference/GUID-34D4968E-C55A-4BC7-B1CE-C84B202217BD.htm#CQLLR2119]:
> {code}
> SELECT T.Ac2, T.Bc2, T.Cc2 
>     FROM S
>         MEASURES A.c2 as Ac2, B.c2 as Bc2, C.c2 as Cc2
>         PATTERN (A (B+ | C)) within 3000 milliseconds 
>         DEFINE 
>             A as A.c1=10 or A.c1=25, 
>             B as B.c1=20 or B.c1=15 or B.c1=25, 
>             C as C.c1=15
>     ) as T
> {code}

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