pgsql: Add tests for UNBOUNDED syntax ambiguity

From: Peter Eisentraut <peter(at)eisentraut(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Add tests for UNBOUNDED syntax ambiguity
Date: 2021-07-01 07:34:20
Message-ID: E1lyrDI-000762-Vg@gemulon.postgresql.org
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Add tests for UNBOUNDED syntax ambiguity

There is a syntactic ambiguity in the SQL standard. Since UNBOUNDED
is a non-reserved word, it could be the name of a function parameter
and be used as an expression. There is a grammar hack to resolve such
cases as the keyword. Add some tests to record this behavior.

Reviewed-by: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
Discussion: https://www.postgresql.org/message-id/flat/b2a09a77-3c8f-7c68-c9b7-824054f87d98%40enterprisedb.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/71ba45a3602da0bdbb518e16e3990cfcf21e5f73

Modified Files
--------------
src/test/regress/expected/window.out | 140 +++++++++++++++++++++++++++++++++++
src/test/regress/sql/window.sql | 66 +++++++++++++++++
2 files changed, 206 insertions(+)

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