Github user ppadma commented on a diff in the pull request:
https://github.com/apache/drill/pull/757#discussion_r103285068
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/ExecConstants.java ---
@@ -413,4 +413,8 @@
String DYNAMIC_UDF_SUPPORT_ENABLED = "exec.udf.enable_dynamic_support";
BooleanValidator DYNAMIC_UDF_SUPPORT_ENABLED_VALIDATOR = new
BooleanValidator(DYNAMIC_UDF_SUPPORT_ENABLED, true, true);
+
+ String USE_DYNAMIC_UDFS = "exec.udf.use_dynamic";
--- End diff --
ok, we need to use readWriteLocks if we update the table each time a
function gets added/removed. That is unnecessary overhead and will cause
contention with concurrency. One option is to split the table into two, one for
built-in functions (which can be accessed without locks) and other for dynamic
functions. That will be a bigger change and like I mentioned before, is not
considered worth the effort.
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