Trino: Output omits time zone information when using CAST

Answered

When using a CAST of a timestamp querying a Trino data source, the timezone information is omitted in the Output and the output is converted to the current_timezone() value. This may confuse people and waste time on solving the issue.

SELECT
raw_ts
, CAST(raw_ts AS TIMESTAMP) AT TIME ZONE 'Europe/Berlin'
, CAST(raw_ts AS TIMESTAMP WITH TIME ZONE) AT TIME ZONE 'Europe/Berlin'
FROM
(SELECT TIMESTAMP '2012-10-31 01:00 Europe/Berlin' raw_ts) d;

Expectation would be to get

  • _col1: 2012-10-31 02:00:00 +01:00 (because the timezone information got lost during the CAST to TIMESTAMP and its using current_timezone which is set to UTC)
  • _col2: 2012-10-31 01:00:00 +01:00

Interesting enough - the information is stored correctly as using to_iso8601() is showing the correct values

SELECT
raw_ts
, to_iso8601(CAST(raw_ts AS TIMESTAMP) AT TIME ZONE 'Europe/Berlin')
, to_iso8601(CAST(raw_ts AS TIMESTAMP WITH TIME ZONE) AT TIME ZONE 'Europe/Berlin')
FROM
(SELECT TIMESTAMP '2012-10-31 01:00 Europe/Berlin' raw_ts) d;

Used system:

  • DataGrip 2021.2.4 and IDEA 2021.2.3
  • Trino driver 351.0

Using Presto driver 0.245.1 instead, the results show up as expected:

Can you please check this issue? Thanks

 

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6 comments

Hello Matthias,
It's probably related to metadata returned by a driver.
Could you please tell us type names of all columns in your first example? To do it hover over column name in result view like shown on screenshot:


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Hi Liudmila Kornilova,

thanks for looking into this. The data types of the first example are as follows:

raw_ts: timestamp with time zone(0) (yyyy-MM-dd HH:mm:ss)
_col1: timestamp with time zone(3)
_col1: timestamp with time zone(3)

 

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Thanks!
I've found the cause of the problem
It will be fixed in v2021.3

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Great to hear! Awesome support. Thanks a lot.

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Was it fixed after all? Query from OP's post returns the same output for me.

Using DataGrip 2023.2.3, Trino 425.0

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Yes, it should be fixed. Please check query examples from the related issue: https://youtrack.jetbrains.com/issue/DBE-13928

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