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https://issues.apache.org/jira/browse/DRILL-4963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15854511#comment-15854511
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ASF GitHub Bot commented on DRILL-4963:
---------------------------------------
Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/701#discussion_r99454180
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/FunctionImplementationRegistry.java
---
@@ -178,22 +192,41 @@ private String functionReplacement(FunctionCall
functionCall) {
}
/**
- * Find the Drill function implementation that matches the name, arg
types and return type.
- * If exact function implementation was not found,
- * loads all missing remote functions and tries to find Drill
implementation one more time.
+ * Finds the Drill function implementation that matches the name, arg
types and return type.
+ *
+ * @param name function name
+ * @param argTypes input parameters types
+ * @param returnType function return type
+ * @return exactly matching function holder
--- End diff --
Thanks for adding the Javadoc! Very helpful.
> 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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