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From: findepi (@findepi) <[email protected]>
To: pgjdbc/pgjdbc <[email protected]>
Subject: Re: [pgjdbc/pgjdbc] issue #1225: Java 8 Time Support for Postgres Arrays
Date: Tue, 30 Jul 2019 11:38:51 +0000
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

@davecramer AFAIU, PostgreSQL `timestamp [without time zone]` and Java `LocalDateTime` are both unrelated to any time zone (session, client's, server's).

Time zones are implicated only because JDBC wants you to use `java.sql.Timestamp` which (AFAICT) is always interpreted in correspondence to JVM zone. (This has inherent pitfalls: `java.sql.Timestamp` cannot represent (zone-less) date/time where JVM has forward DST change or forward policy change.)

I've investigated this in Presto SQL (https://github.com/prestosql/presto/issues/37 & related issues and PRs) and my opinion is that we we should use no time zone at all when handling `timestamp` values and treat them as "year/month/day hour/minute/second/millis" "structs".
(I don't know how this plays with PostgreSQL protocol. This is beyond my knowledge.)

cc @electrum

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