Sergey Nuyanzin created FLINK-39284:
---------------------------------------

             Summary: CREATE OR ALTER MATERIALIZED TABLE doesn't respect schema 
of existing table
                 Key: FLINK-39284
                 URL: https://issues.apache.org/jira/browse/FLINK-39284
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / Planner
            Reporter: Sergey Nuyanzin
            Assignee: Sergey Nuyanzin


A number of cases like 
{code:sql}
CREATE MATERIALIZED TABLE mt1 (
   id INT, t TIMESTAMP_LTZ(3)
)
AS SELECT 1 as id, current_timestamp as t
{code}
and then
{code:sql}
CREATE OR ALTER MATERIALIZED TABLE mt1 (
   id INT, t TIMESTAMP_LTZ(3),
   WATERMARK FOR t as current_timestamp - INTERVAL '5' SECOND
)
AS SELECT 1 as id, current_timestamp as t
{code}

it will ignore watermark (all cases like create/modify/drop)
same for constraint
also similar issue for column comments



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