godfrey he created FLINK-18731:
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Summary: The monotonicity of UNIX_TIMESTAMP function is not correct
Key: FLINK-18731
URL: https://issues.apache.org/jira/browse/FLINK-18731
Project: Flink
Issue Type: Bug
Components: Table SQL / Planner
Reporter: godfrey he
Fix For: 1.12.0
Currently, the monotonicity of {{UNIX_TIMESTAMP}} function is always
{{INCREASING}}, actually, when it has empty function arguments
({{UNIX_TIMESTAMP()}}, is equivalent to {{NOW}}), its monotonicity is
INCREASING. otherwise its monotonicity should be NOT_MONOTONIC. (e.g.
UNIX_TIMESTAMP(string))
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