Jark Wu created FLINK-20370:
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Summary: Result is wrong when sink primary key is not the same with query
Key: FLINK-20370
URL:
https://issues.apache.org/jira/browse/FLINK-20370 Project: Flink
Issue Type: Bug
Components: Table SQL / Planner
Reporter: Jark Wu
Both sources are upsert-kafka which synchronizes the changes from MySQL tables (source_city, source_customer). The sink is another MySQL table which is in upsert mode with "city_name" primary key. The join key is "city_id".
In this case, the result will be wrong when updating {{source_city.city_name}} column in MySQL, as the UPDATE_BEFORE is ignored and the old city_name is retained in the sink table.
{code}
Sink(table=[default_catalog.default_database.sink_kafka_count_city], fields=[city_name, count_customer, sum_gender], changelogMode=[NONE])
+- Calc(select=[city_name, CAST(count_customer) AS count_customer, CAST(sum_gender) AS sum_gender], changelogMode=[I,UA,D])
+- Join(joinType=[InnerJoin], where=[=(city_id, id)], select=[city_id, count_customer, sum_gender, id, city_name], leftInputSpec=[JoinKeyContainsUniqueKey], rightInputSpec=[JoinKeyContainsUniqueKey], changelogMode=[I,UA,D])
:- Exchange(distribution=[hash[city_id]], changelogMode=[I,UA,D])
: +- GlobalGroupAggregate(groupBy=[city_id], select=[city_id, COUNT_RETRACT(count1$0) AS count_customer, SUM_RETRACT((sum$1, count$2)) AS sum_gender], changelogMode=[I,UA,D])
: +- Exchange(distribution=[hash[city_id]], changelogMode=[I])
: +- LocalGroupAggregate(groupBy=[city_id], select=[city_id, COUNT_RETRACT(*) AS count1$0, SUM_RETRACT(gender) AS (sum$1, count$2)], changelogMode=[I])
: +- Calc(select=[city_id, gender], changelogMode=[I,UB,UA,D])
: +- ChangelogNormalize(key=[customer_id], changelogMode=[I,UB,UA,D])
: +- Exchange(distribution=[hash[customer_id]], changelogMode=[UA,D])
: +- MiniBatchAssigner(interval=[3000ms], mode=[ProcTime], changelogMode=[UA,D])
: +- TableSourceScan(table=[[default_catalog, default_database, source_customer]], fields=[customer_id, city_id, age, gender, update_time], changelogMode=[UA,D])
+- Exchange(distribution=[hash[id]], changelogMode=[I,UA,D])
+- ChangelogNormalize(key=[id], changelogMode=[I,UA,D])
+- Exchange(distribution=[hash[id]], changelogMode=[UA,D])
+- MiniBatchAssigner(interval=[3000ms], mode=[ProcTime], changelogMode=[UA,D])
+- TableSourceScan(table=[[default_catalog, default_database, source_city]], fields=[id, city_name], changelogMode=[UA,D])
{code}
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