Jark Wu created FLINK-14323:
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Summary: 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
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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