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https://issues.apache.org/jira/browse/FLINK-36547?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yubin Li updated FLINK-36547:
-----------------------------
Summary: Add option to retain `RowKind` sematics after
serialization/deserialization for cdc formats (was: Add option to retain
`RowKind` sematics after serialization/deserialization)
> Add option to retain `RowKind` sematics after serialization/deserialization
> for cdc formats
> -------------------------------------------------------------------------------------------
>
> Key: FLINK-36547
> URL: https://issues.apache.org/jira/browse/FLINK-36547
> Project: Flink
> Issue Type: Improvement
> Components: Formats (JSON, Avro, Parquet, ORC, SequenceFile)
> Affects Versions: 2.0.0
> Reporter: Yubin Li
> Priority: Major
> Attachments: image-2024-10-16-11-01-54-790.png,
> image-2024-10-16-11-02-34-406.png
>
>
> As official docs said, `RowKind` sematics have been changed: -U -> -D, +D ->
> +I
> {code:java}
> Flink also supports to encode the INSERT/UPDATE/DELETE messages in Flink SQL
> as Debezium JSON or Avro messages, and emit to external systems like Kafka.
> However, currently Flink can’t combine UPDATE_BEFORE and UPDATE_AFTER into a
> single UPDATE message. Therefore, Flink encodes UPDATE_BEFORE and
> UDPATE_AFTER as DELETE and INSERT Debezium messages. {code}
> In fact, we also have a demand to make the `RowKind` sematics consistent in
> many scenarios. we have taken advantage of the difference between
> UPDATE_BEFORE and UPDATE_AFTER to implement the feature and made it run well
> in bussiness.
> {code:java}
> create table datagen1 (id int, name string) with
> ('connector'='datagen','number-of-rows'='5', 'fields.id.min'='1',
> 'fields.id.max'='2');
> // add 'debezium-json.retain.rowkind' = 'true'
> create table t2 (id int, name string, num bigint) WITH (
> 'topic' = 't2',
> 'connector' = 'kafka',
> 'properties.bootstrap.servers' = 'xx',
> 'properties.group.id' = 'test',
> 'scan.startup.mode' = 'earliest-offset',
> 'format' = 'debezium-json',
> 'key.format' = 'json',
> 'key.fields' = 'id',
> 'debezium-json.timestamp-format.standard' = 'ISO-8601',
> 'debezium-json.schema-include' = 'false',
> 'debezium-json.retain.rowkind' = 'true'
> );
> insert into t2 select id, max(name) as name, count(1) as num from datagen1
> group by id;
> insert into print1 select * from t2;
> {code}
> output result:
> !image-2024-10-16-11-02-34-406.png|width=660,height=153!
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