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https://issues.apache.org/jira/browse/FLINK-14323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu closed FLINK-14323.
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Resolution: Won't Fix
> Serialize Expression to String and parse String to Expression
> -------------------------------------------------------------
>
> Key: FLINK-14323
> URL: https://issues.apache.org/jira/browse/FLINK-14323
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API, Table SQL / Planner
> Reporter: Jark Wu
> Priority: Major
>
> In order to persist/store the watermark strategy expression (and the future
> computed column expression), we should find a way to serialize Expression to
> String and parse String back to Expression.
> More details can be discussed under this JIRA issue, and this may need
> another FLIP.
> There are two ways:
> 1) introduce a {{SqlExpression}} which wraps the raw SQL string and resolved
> DataType. Only implement the asSerializableString for {{SqlExpression}}.
> 2) support all of the ResolvedExpressions’ asSerializableString.
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