[jira] [Created] (TOREE-501) Function type conversion error - but the code seems work

["Hendrik Gärtner (JIRA)" <ji...@apache.org>]

Hendrik Gärtner created TOREE-501:
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             Summary: Function type conversion error - but the code seems work 
                 Key: TOREE-501
                 URL: https://issues.apache.org/jira/browse/TOREE-501
             Project: TOREE
          Issue Type: Bug
          Components: Kernel
    Affects Versions: 0.3.0
         Environment: Python 3.6.4 |Anaconda, Inc.| (default, Jan 16 2018, 18:10:19) 
[GCC 7.2.0], notebook server: 5.4.0 Apache Toree 0.3.0
            Reporter: Hendrik Gärtner


Dear Toree Developers,

the following function definition results in a confusing type error:

def appmodel[C,D] (testdata: Seq[Map[String,Any]], idKey:String) (m:(Map[String,Any],String) => (D,C)):Seq[(D,C)] = {

     
    testdata.map (m(_,idKey))
    
} 

The code seems to work but sometimes the following error appears after execution:

<console>:146: error: missing argument list for method appmodel Unapplied methods are only converted to functions when a function type is expected. You can make this conversion explicit by writing `appmodel _` or `appmodel(_,_)(_)` instead of `appmodel`. appmodel ^

 

With best wishes & thanks for your great efforts on Toree



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