Sergey Nuyanzin created FLINK-38027:
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             Summary: Apply simplify for watermark expresions
                 Key: FLINK-38027
                 URL: https://issues.apache.org/jira/browse/FLINK-38027
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
            Reporter: Sergey Nuyanzin
            Assignee: Sergey Nuyanzin


Currently watermark expressions are not simplified
for instance
{code}
      "`ts` - ( - ( - (INTERVAL '10' SECOND)))",
      "`ts` - ARRAY[INTERVAL '10' SECOND, INTERVAL '1' SECOND][1]",
      "`ts` - CASE WHEN true THEN INTERVAL '10' SECOND ELSE INTERVAL '2' SECOND 
END"
{code}

every row could be simplified to
{code}
  "`ts` - INTERVAL '10' SECOND"
{code}



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