gabotechs commented on PR #22689:
URL: https://github.com/apache/datafusion/pull/22689#issuecomment-4934207444
Ok, did some research, and it looks like in Spark and Trino there's these
functions:
```
- transform_values(map, function) — transforms each value, keeping keys
unchanged. Function signature: (k, v) -> new_v.
- transform_keys(map, function) — transforms each key, keeping values
unchanged. Function signature: (k, v) -> new_k.
```
Spark
- transform_keys
(https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.functions.transform_keys.html)
(PySpark) / SQL version
(https://docs.databricks.com/gcp/en/sql/language-manual/functions/transform_keys)
- transform_values
(https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.functions.transform_values.html)
(PySpark) / SQL version
(https://docs.databricks.com/sql/language-manual/functions/transform_values.html)
Trino
- Map functions and operators
(https://trino.io/docs/current/functions/map.html) — covers both transform_keys
and transform_values on the same
page (Trino doesn't split them into separate doc pages like
Spark/Databricks does)
So indeed this project might be a good place to host them.
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