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https://issues.apache.org/jira/browse/FLINK-21978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17309258#comment-17309258
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Timo Walther commented on FLINK-21978:
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My first impression was that this is issue is actually incorrect.
{{TIMESTAMP_LTZ}} was supposed to be the only timestamp type that can be easily
converted back and forth numeric types. It should have `java.time.Instant`
semantics and in Java `java.time.Instant#toEpochMilli` is provided.
> Disable cast conversion between Numeric type and TIMESTAMP_LTZ type
> -------------------------------------------------------------------
>
> Key: FLINK-21978
> URL: https://issues.apache.org/jira/browse/FLINK-21978
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
> Affects Versions: 1.13.0
> Reporter: Leonard Xu
> Assignee: Leonard Xu
> Priority: Major
> Labels: pull-request-available
>
> Currently we has supported the cast conversion between Numeric type and
> TIMESTAMP_LTZ type, we suppose the numeric value e.g `Long type 1000L` as
> epoch seconds and then cast to TIMESTAMP_LTZ, but the java.lang.Long is a
> conversion class of `LocalZonedTimestampType` and treats as milliseconds.
> To avoid the inconsistency, we should disable it and encourage user to use
> `TO_TIMESTAMP_LTZ(numeric, precisoon)` function.
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