[jira] [Created] (FLINK-24588) Optimisation of chained cast calls can lead to unexpected behaviour

["Marios Trivyzas (Jira)" <ji...@apache.org>]

Marios Trivyzas created FLINK-24588:
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             Summary: Optimisation of chained cast calls can lead to unexpected behaviour
                 Key: FLINK-24588
                 URL: https://issues.apache.org/jira/browse/FLINK-24588
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / Planner
    Affects Versions: 1.15.0
            Reporter: Marios Trivyzas


Simplification of Cast chained calls can lead to unexpected behaviour:
CAST(CAST(CAST(123456 AS TINYINT) AS INT) AS BIGINT)
is simplified to 
{noformat}
CAST(123456 AS BIGINT){noformat}
and returns *123456* with *BIGINT* data type, where the first inner cast as TINYINT should already fail because the value is out of range.

For example, for PostgreSQL:
{noformat}
postgres=# select 123456::smallint::int::bigint;
ERROR: smallint out of range

{noformat}
Corresponding issue has been create at calcite: https://issues.apache.org/jira/browse/CALCITE-4861



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