Document PG CDC parameter check

[emile-00]

Info

• Description:
  Make parameters schema and slot.name optional. Note slot.name is randomly generated by default.

• Preview:
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• Related code PR:
  https://www.risingwave.dev/docs/current/ingest-from-postgres-cdc/#with-parameters

• Related doc issue:
  Resolves Document parameter check for CDC connector #661

• Notes:
  [ Any additional information? ]

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[emile-00]

@fuyufjh Is there a way for users to query the slot like in Materialize?

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[fuyufjh]

@fuyufjh Is there a way for users to query the slot like in Materialize?

I think no. Can you give an example of "query the slot like in Materialize"?

[emile-00]

@fuyufjh Is there a way for users to query the slot like in Materialize?

I think no. Can you give an example of "query the slot like in Materialize"?

In Materialize, they're able to use SELECT * FROM mz_internal.mz_postgres_sources; to look up the name of the replication slot.

[fuyufjh]

@fuyufjh Is there a way for users to query the slot like in Materialize?

I think no. Can you give an example of "query the slot like in Materialize"?

In Materialize, they're able to use SELECT * FROM mz_internal.mz_postgres_sources; to look up the name of the replication slot.

cc. @tabVersion

[tabVersion]

@fuyufjh Is there a way for users to query the slot like in Materialize?

I think no. Can you give an example of "query the slot like in Materialize"?

In Materialize, they're able to use SELECT * FROM mz_internal.mz_postgres_sources; to look up the name of the replication slot.

cc. @tabVersion

We don't support this feature. We may look into it if needed. cc @StrikeW