feat: add support for set operations

voltrondata / spark-substrait-gateway

Implements a gateway that speaks the SparkConnect protocol and drives a backend using Substrait (over ADBC Flight SQL).

Apache License 2.0

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feat: add support for set operations #26

Closed EpsilonPrime closed 5 months ago

EpsilonPrime commented 5 months ago

Basic union, subtract, and intersect support is added. Substrait does not define some forms so those will return errors. Also backends have their own varying support.