[jira] [Created] (FLINK-40481) SHOW CREATE MATERIALIZED TABLE displays a future timestamp for FROM_NOW() instead of past

["Arvid Heise (Jira)" <ji...@apache.org>]

Arvid Heise created FLINK-40481:
-----------------------------------

             Summary: SHOW CREATE MATERIALIZED TABLE displays a future timestamp for FROM_NOW(<interval>) instead of past
                 Key: FLINK-40481
                 URL: https://issues.apache.org/jira/browse/FLINK-40481
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / API
    Affects Versions: 2.3.0
            Reporter: Arvid Heise
            Assignee: Arvid Heise



{noformat}
CREATE MATERIALIZED TABLE mt
START_MODE = FROM_NOW(INTERVAL '3' MINUTE)
AS SELECT ...

SHOW CREATE TABLE mt;
-- START_MODE = FROM_NOW(INTERVAL '3' MINUTE) /* Evaluated to FROM_TIMESTAMP(TIMESTAMP '2026-08-27 09:43:12') at execution */
{noformat}


Statement created at {{2026-08-27 09:40:12}}. The comment claims resolution to {{09:43:12}} — three minutes in the future. The actual runtime resolution of {{FROM_NOW(<interval>)}} reads from three minutes in the past (documented semantics, matching Kafka's relative-offset behavior); only the {{SHOW CREATE}} annotation is wrong.

{{ShowCreateUtil.extractStartMode}} builds the comment with:
{code:java}
LocalDateTime.now().plus(amount).toInstant(ZoneOffset.UTC)
{code}
which should be {{.minus(amount)}}. Introduced in FLINK-39323.



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