Add support to read DateTime offsets about clickhouse-net

[killwort]

It is impossible.
Check clickhouse docs:
https://clickhouse.com/docs/en/sql-reference/data-types/date32

That type does not store TZ offset information, only number of seconds since unix epoch. No cast on C# side would get that info back.

[rsibanez89]

@killwort Sure you are right, Clickhouse Date32 doesn't support offset.
But I'm talking about Clickhouse DateTime.

Check this simple query:

SELECT toDateTime(now(), 'Australia/Sydney') AS column, toTypeName(column) AS column_type;

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I just need to get back the offset, and I think if I read as string with row.GetString(i) I should be able to read it.

[killwort]

DateTime does not contain TZ info too. Actually, column type contains it DateTime('Australia/Sydney') however it is not contained in the values. Thus, all values in the column have same TZ and you actually supplied that TZ in your SQL. That's not driver's responsibility to parse and convert TZ offset, moreover, TZs in clickhouse are represented in 'unix style' strings and .net doesn't know anything about these values and cannot convert them to correct TZ offset.

Although it might seem easy to retain full TZ info while reading response (see ColumnType.cs, line 116) yet from the client code you'll never be able to read it in any reasonable way as ADO completely hides that 'complexity'.