Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/574#discussion_r80650009
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/DropFunctionHandler.java
---
@@ -48,54 +48,77 @@ public DropFunctionHandler(SqlHandlerConfig config) {
}
/**
- * Drops UDFs dynamically.
+ * Unregisters UDFs dynamically. Process consists of several steps:
+ * <ol>
+ * <li>Registering jar in jar registry to ensure that several jars with
the same name is not being unregistered.</li>
+ * <li>Starts remote unregistration process, gets list of all jars and
excludes jar to be deleted.</li>
+ * <li>Signals drill bits to start local unregistration process.</li>
+ * <li>Removes source and binary jars from registry area.</li>
+ * </ol>
--- End diff --
As noted in previous comments, the expected behavior is to fail.
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