Hi Andrew, Thanks for sharing the SPIP, Does that mean the MERGE statement would be deprecated? Also I think there was a small typo I have suggested in the doc.
Regards, Vaibhav On Fri, Mar 27, 2026 at 10:15 AM DB Tsai <[email protected]> wrote: > +1 > > DB Tsai | https://www.dbtsai.com/ | PGP 42E5B25A8F7A82C1 > > On Mar 26, 2026, at 6:08 PM, Andreas Neumann <[email protected]> wrote: > > Hi all, > > I’d like to start a discussion on a new SPIP to introduce Auto CDC > support to Apache Spark. > > - SPIP Document: > > https://docs.google.com/document/d/1Hp5BGEYJRHbk6J7XUph3bAPZKRQXKOuV1PEaqZMMRoQ/ > - > > JIRA: <https://issues.apache.org/jira/browse/SPARK-55668> > https://issues.apache.org/jira/browse/SPARK-5566 > > Motivation > > With the upcoming introduction of standardized CDC support > <https://issues.apache.org/jira/browse/SPARK-55668>, Spark will soon have > a unified way to produce change data feeds. However, consuming these > feeds and applying them to a target table remains a significant challenge. > > Common patterns like SCD Type 1 (maintaining a 1:1 replica) and SCD Type 2 > (tracking full change history) often require hand-crafted, complex MERGE > logic. In distributed systems, these implementations are frequently > error-prone when handling deletions or out-of-order data. > Proposal > > This SPIP proposes a new "Auto CDC" flow type for Spark. It encapsulates > the complex logic for SCD types and out-of-order data, allowing data > engineers to configure a declarative flow instead of writing manual MERGE > statements. This feature will be available in both Python and SQL. > Example SQL: > -- Produce a change feed > CREATE STREAMING TABLE cdc.users AS > SELECT * FROM STREAM my_table CHANGES FROM VERSION 10; > > -- Consume the change feed > CREATE FLOW flow > AS AUTO CDC INTO > target > FROM stream(cdc_data.users) > KEYS (userId) > APPLY AS DELETE WHEN operation = "DELETE" > SEQUENCE BY sequenceNum > COLUMNS * EXCEPT (operation, sequenceNum) > STORED AS SCD TYPE 2 > TRACK HISTORY ON * EXCEPT (city); > > > Please review the full SPIP for the technical details. Looking forward to > your feedback and discussion! > > Best regards, > > Andreas > > >
