[jira] [Created] (FLINK-30227) Add LeafEmptyFunction for predicate without fields

[Shammon (Jira)]

Shammon created FLINK-30227:
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             Summary: Add LeafEmptyFunction for predicate without fields
                 Key: FLINK-30227
                 URL: https://issues.apache.org/jira/browse/FLINK-30227
             Project: Flink
          Issue Type: Improvement
          Components: Table Store
    Affects Versions: table-store-0.3.0
            Reporter: Shammon


In addition to `LeafBinaryFunction` and `LeafUnaryFunction`, we should add 
`LeafEmptyFunction` for predicate



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