Feng Jin created FLINK-33070:
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Summary: Add doc for 'unnest'
Key: FLINK-33070
URL: https://issues.apache.org/jira/browse/FLINK-33070
Project: Flink
Issue Type: Improvement
Components: Table SQL / Runtime
Reporter: Feng Jin
Row and column transformation is a commonly used approach. In Flink SQL, we can
use unnest for this purpose.
However, the usage and support of unnest are not explained in the documentation.
I think we can at least add it to the built-in functions section
(https://nightlies.apache.org/flink/flink-docs-master/docs/dev/table/functions/systemfunctions/#scalar-functions)
， or we provide some examples.
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