Glauber M Dantas created FLINK-35392:
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Summary: SQL Lookup Join on external database failing when using
'FOR SYSTEM_TIME AS OF' statement
Key: FLINK-35392
URL: https://issues.apache.org/jira/browse/FLINK-35392
Project: Flink
Issue Type: Bug
Components: Table SQL / Planner
Affects Versions: 1.18.1
Reporter: Glauber M Dantas
When transforming a DataStream to a Table and then using that table in a Join
Lookup, an exception is raised: {{{}"Temporal table join currently only
supports 'FOR SYSTEM_TIME AS OF' left table's time attribute field"{}}}.
>From what I understood from the issue, it happens as the planner expects that
>the Tables part of the Join are registered previously on the Catalog.
The solution was to avoid using the DataStream to Table conversion:
```
Table kinesisStreamTbl = tblEnv.fromDataStream(
kinesisDataStream,
Schema.newBuilder()
// "proc_time" would be needed to make the lookup using
'FOR SYSTEM_TIME AS OF'; see:
https://nightlies.apache.org/flink/flink-docs-master/docs/dev/table/sql/queries/joins/#processing-time-temporal-join
.columnByExpression("proc_time", "PROCTIME()")
.build()
);
```
And instead create and use a Table registered on the Catalog:
```
tblEnv.createTable("KinesisInput", TableDescriptor.forConnector("kinesis")...);
```
If you need more details, you may access the discussion at:
https://stackoverflow.com/questions/78485099/sedona-flink-sql-lookup-on-external-database-failing-when-using-for-system-time
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