string_to_array, array_to_string function without separator

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: string_to_array, array_to_string function without separator
Date: 2019-03-15 04:04:02
Message-ID: CAFj8pRD81hrWV3h9soFHLcBbHAjJWsAiJxfVgYcdb4kjUw-D1w@mail.gmail.com
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Hi

I propose mentioned functions without specified separator. In this case the
string is transformed to array of chars, in second case, the array of chars
is transformed back to string.

Comments, notes?

Regards

Pavel

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