SQL: support Grafana aggregation macros ($__timeGroup and $__timeGroupAlias)

src/connectors/utils.ts

@@ -8,6 +8,12 @@ export function processSQLLimitOffset(sql: string, limit: number, offset: number
   }
   sql = splits[0]; // removes ";" from EOL
 
+  const reAggregation = /\$__timeGroup(?:Alias)?\(\s*([^,]+)\s*,\s*\$__interval[^\)]*\)/igm;
+  const occurence = reAggregation.exec(sql);
+  if(occurence) {
+    sql = sql.replace(reAggregation, occurence[1]);
+  }
+
   let relim = /limit [0-9]+/ig;
   let reoff = /offset [0-9]+/ig;