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https://issues.apache.org/jira/browse/FLINK-39358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18069844#comment-18069844
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Sergey Nuyanzin commented on FLINK-39358:
-----------------------------------------
Merged as
[dc6d1288fb1ae2493e8e697d6bbfe32c2ef82cac|https://github.com/apache/flink/commit/dc6d1288fb1ae2493e8e697d6bbfe32c2ef82cac]
> Constraint and watermark should stay while CoA MT if there is no explicit
> change with schema or constraint definition
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-39358
> URL: https://issues.apache.org/jira/browse/FLINK-39358
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
> Reporter: Sergey Nuyanzin
> Assignee: Sergey Nuyanzin
> Priority: Major
> Labels: pull-request-available
>
> The idea is that if existing table has a constraint or watermark
> and then there is CoA DDL without schema or constraint definition then the
> existing constraint/watermark should stay.
>
> If there are explicit schema/constraint, then they should be applied
> like
> {code:sql}
> CREATE MATERIALIZED TABLE mt (
> CONSTRAINT ct1 PRIMARY KEY(a) NOT ENFORCED
> )
> COMMENT 'materialized table comment'
> PARTITIONED BY (a, d)
> WITH (
> 'connector' = 'filesystem',
> 'format' = 'json'
> )
> FRESHNESS = INTERVAL '30' SECOND
> REFRESH_MODE = FULL
> AS SELECT * FROM t1
> {code}
> and then
> this query should drop the constraint
> {code:sql}
> CREATE OR ALTER MATERIALIZED TABLE mt (a BIGINT NOT NULL, b STRING, c INT, d
> STRING)
> AS SELECT * FROM t1;
> {code}
> and this should not
> {code:sql}
> CREATE OR ALTER MATERIALIZED TABLE mt
> AS SELECT * FROM t1;
> {code}
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