SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 5)
    Identifier step
    Function countDistinct (children 1)
     ExpressionList (children 1)
      Identifier metric_id
    Function count (children 1)
     ExpressionList
    Function min (children 1)
     ExpressionList (children 1)
      Identifier grid_timestamp
    Function max (children 1)
     ExpressionList (children 1)
      Identifier grid_timestamp
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_resampled_timeseries
   ExpressionList (children 1)
    Identifier step
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier step
