hi,all
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tableEnv.createTemporaryView("sensor", sensorTable);
val resultSqlTable = tableEnv.sqlQuery("select country, count(order_id) as cnt from sensor group by country");??????socket?????????????? 001 usa 002 usa 003 china 002 china 004 usa ?????????????????????????????? usa, 2 china, 2 ?????????????? usa, 3 china, 2 ??????usa??????????????????????????????????????usa???????????? ???????????????????????? ?????????????????????????????????????????? thanks
