Github user nagarajanchinnasamy commented on the issue:
https://github.com/apache/drill/pull/685
@arina-ielchiieva @sudheeshkatkam I have made the following changes to
support invocation of UDFs without parenthesis.
1. Introduced `isNiladic` option in FunctionTemplate and added a property
in DrillFuncHolder, FunctionAttributes, DrillSqlOperator classes
2. Overridden DrillSqlOperator.getSyntax() to return SqlSyntax.FUNCTION_ID
when isNiladic is true
3. Modified all the places to pass false for isNiladic parameter to
DrillSqlOperator constructor -- so that existing behavior is not impacted
4. In DrillOperatorTable, adding an operator to operatorList when the
syntax of an operator is either FUNCTION or FUNCTION_ID
5. Modified tests to invoke session_id without parenthesis.
Please review the changes.
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