strange evaluation Window function and SRF functions?

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: strange evaluation Window function and SRF functions?
Date: 2012-07-30 16:19:04
Message-ID: CAFj8pRAzXKJ=bkjMpV4oeJ-u=g1Ldf5gYOGGxBhJS15ueW8Dcg@mail.gmail.com
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Hello

I seen nice trick based on window function
http://stackoverflow.com/questions/11700930/how-can-i-trim-a-text-array-in-postgresql

but isn't it example of wrong evaluation? Result of row_number is not
correct

Regards

Pavel

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