Ingo Bürk created FLINK-24050:
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Summary: Support primary keys on metadata columns
Key: FLINK-24050
URL: https://issues.apache.org/jira/browse/FLINK-24050
Project: Flink
Issue Type: Improvement
Components: Table SQL / API
Reporter: Ingo Bürk
Currently, primary keys are required to consist solely of physical columns.
However, there might be scenarios where the actual payload/records do not
contain a suitable primary key, but a unique identifier is available through
metadata. In this case it would make sense to define the primary key on such a
metadata column:
{code:java}
CREATE TABLE T (
uid METADATA,
content STRING
PRIMARY KEY (uid) NOT ENFORCED
) WITH (…)
{code}
A simple example for this would be IMAP: there is nothing unique about any
single email as a record, but each email in a specific folder on an IMAP server
has a unique UID (I'm excluding some irrelevant technical details here).
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