Does anyone know where the retract of flinksql can be specified? Only api code settings can be seen in online materials

Excuse me, does anyone know FlinkSQL Of Retrack Where can I specify ？ Online materials only see API How the code is set , And the way to look is deprecated Of .

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Take the answer 1：

If you don't specify it, it depends on the situation . For example, if it is join Words , Without aggregation regular join yes retract,interval join The output is append flow . For example, use flink upsert-kafka connector The output is upsert flow . I don't know anything else . But I still suggest reading this article https://nightlies.apache.org/flink/flink-docs-release-1.13/docs/dev/table/data_stream_api/ and https://nightlies.apache.org/flink/flink-docs-release-（ This answer is collated from 【③ Group 】Apache Flink China Community ）

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