kkhatua commented on issue #1491: DRILL-6084: Show Drill functions in WebUI for 
autocomplete
URL: https://github.com/apache/drill/pull/1491#issuecomment-429644361
 
 
   That's a good point. Under the `sys.functions` implementation, there were 
2700+ built in functions (when accounting for the different signatures), while  
there are over 450 unique function names. From these, I've pruned out 
non-alphabetical functions, but I am certain there are many functions like 
`converttonullabledecimal18`.
   While I don't know why such functions exist in the registry if they are not 
expected to be used, my thinking is that I don't think users will use such 
functions without knowing what they do. We could define a 'black-list' of such 
function names, but that adds the task of having to maintain this in the long 
run.

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