JJJJude created FLINK-35313: ------------------------------- Summary: Add upsert changelog mode to avoid UPDATE_BEFORE records push down Key: FLINK-35313 URL: https://issues.apache.org/jira/browse/FLINK-35313 Project: Flink Issue Type: New Feature Components: Flink CDC Reporter: JJJJude
I try to use flink sql to write mysql cdc-data into redis as a dimension table for other business use. When executing {{UPDATE}} DML, the cdc-data will be converted into {{-D (UPDATE_BEFORE)}} and {{+I (UPDATE_AFTER)}} two records to sink redis. However, delete first will cause other data streams to be lost(NULL) when join data, which is unacceptable. I think we can add support for [upser changelog mode|https://nightlies.apache.org/flink/flink-docs-master/docs/dev/table/concepts/dynamic_tables/#table-to-stream-conversion] by adding changelogMode option with mandatory primary key configuration.Basically, with {{changelogMode=upsert}} we will avoid {{UPDATE_BEFORE}} rows and we will require a primary key for the table. -- This message was sent by Atlassian Jira (v8.20.10#820010)