SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 2)
      Function merge (children 1)
       ExpressionList (children 2)
        Identifier test
        Literal \'^hits_s3$\'
      SampleRatio 1 / 2
