rg/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala#L91
>
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> Jacek Laskowski
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Hi,
I'm using Apache Calcite to run some SQL transformations on Apache sparks
SQL statements. I would like to extract the type signature out
of spark.catalog.listFunctions to be able to register them in Calcite with
their proper signature.
>From the API, I can get the fully qualified class name
