yjshen opened a new issue #2092:
URL: https://github.com/apache/arrow-datafusion/issues/2092


   It would be nice if we also support three arguments substring for Ballista.
   
   substring impl: 
https://github.com/apache/arrow-datafusion/blob/master/datafusion-physical-expr/src/unicode_expressions.rs#L413
   
   For DataFrame API: 
https://github.com/apache/arrow-datafusion/blob/master/datafusion-expr/src/expr_fn.rs#L256
   
   For Ballista:  
https://github.com/apache/arrow-datafusion/blob/master/datafusion-proto/src/from_proto.rs#L1138-L1141


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