wch661 opened a new issue #8971: No match found for function signature STDDEV_POP(<NUMERIC>) URL: https://github.com/apache/incubator-druid/issues/8971 I'm using apache druid 0.15.1. This exception occurs when using the std function to aggregate data. ``` Unknown exception / org.apache.calcite.runtime.CalciteContextException: From line 3, column 5 to line 3, column 33: No match found for function signature STDDEV_POP(<NUMERIC>) / org.apache.calcite.tools.ValidationException ``` Sql： ``` SELECT TIME_FLOOR("__time", 'PT1M') AS "dt_1min", STDDEV_POP ("XXXXXXXX_Speed") AS std_1min FROM "test" GROUP BY TIME_FLOOR("__time", 'PT1M') ORDER BY TIME_FLOOR("__time", 'PT1M') ``` I have read about this page: https://druid.apache.org/docs/latest/development/extensions-core/stats.html. Added the extension `druid-stats`.  Extensions are loaded in all nodes.  But this exception still occurs when using the std function. Can anyone help me?
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