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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4963) Issues when overloading Drill native functions with dynamic UDFs
Date Mon, 06 Feb 2017 18:39:41 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15854521#comment-15854521
] 

ASF GitHub Bot commented on DRILL-4963:
---------------------------------------

Github user paul-rogers commented on the issue:

    https://github.com/apache/drill/pull/701
  
    It seems that the concept of overloading, is, itself, ambiguous. If I define a function
`foo(long)`, but call it with an `int`, we won't get an exact match, will we? So, on every
call we'd have to check if there is a new, better, match for `foo()` in the registry. This
means a call to ZK for every function in every query where we don't have an exact parameter
match. My suspicion is that this will be a performance issue, but we won't know until someone
tests it.
    
    I wonder if we should do this fix incrementally. This PR is better than the original,
as it does handle overloads. After that, we can do a bit of performance testing to see the
impact of checking ZK for the version on every overloaded method. Any performance improvement
can be done as separate JIRA and PR.


> Issues when overloading Drill native functions with dynamic UDFs
> ----------------------------------------------------------------
>
>                 Key: DRILL-4963
>                 URL: https://issues.apache.org/jira/browse/DRILL-4963
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Functions - Drill
>    Affects Versions: 1.9.0
>            Reporter: Roman
>            Assignee: Arina Ielchiieva
>             Fix For: Future
>
>         Attachments: subquery_udf-1.0.jar, subquery_udf-1.0-sources.jar, test_overloading-1.0.jar,
test_overloading-1.0-sources.jar
>
>
> I created jar file which overloads 3 DRILL native functions (LOG(VARCHAR-REQUIRED), CURRENT_DATE(VARCHAR-REQUIRED)
and ABS(VARCHAR-REQUIRED,VARCHAR-REQUIRED)) and registered it as dynamic UDF.
> If I try to use my functions I will get errors:
> {code:xml}
> SELECT CURRENT_DATE('test') FROM (VALUES(1));
> {code}
> Error: FUNCTION ERROR: CURRENT_DATE does not support operand types (CHAR)
> SQL Query null
> {code:xml}
> SELECT ABS('test','test') FROM (VALUES(1));
> {code}
> Error: FUNCTION ERROR: ABS does not support operand types (CHAR,CHAR)
> SQL Query null
> {code:xml}
> SELECT LOG('test') FROM (VALUES(1));
> {code}
> Error: SYSTEM ERROR: DrillRuntimeException: Failure while materializing expression in
constant expression evaluator LOG('test').  Errors: 
> Error in expression at index -1.  Error: Missing function implementation: castTINYINT(VARCHAR-REQUIRED).
 Full expression: UNKNOWN EXPRESSION.
> But if I rerun all this queries after "DrillRuntimeException", they will run correctly.
It seems that Drill have not updated the function signature before that error. Also if I add
jar as usual UDF (copy jar to /drill_home/jars/3rdparty and restart drillbits), all queries
will run correctly without errors.



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