Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/storm/pull/1169#discussion_r54837625
--- Diff: external/sql/storm-sql-core/src/codegen/includes/parserImpls.ftl
---
@@ -83,4 +83,23 @@ SqlNode SqlCreateTable() :
input_format_class_name, output_format_class_name, location,
tbl_properties, select);
}
+}
+
+/**
+ * CREATE FUNCTION functionname AS 'classname'
+ */
+SqlNode SqlCreateFunction() :
+{
+ SqlParserPos pos;
+ SqlIdentifier functionName;
+ SqlNode className;
+}
+{
+ <CREATE> { pos = getPos(); }
+ <FUNCTION>
+ functionName = CompoundIdentifier()
+ <AS>
+ className = StringLiteral() {
--- End diff --
The syntax closely follows the hive syntax for defining UDFs. Whats
required is each UDF should map to a unique class with an `evaluate` method.
Multiple such classes can be in the same jar and added to the classpath. (for
storm, it could be placed under extlib directory). Will update the docs with
this info.
Hive has an additional syntax to specify jar file in its DDL syntax which
is not supported as of now.
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