Explain EXPLAIN ESTIMATE (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 2)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Function count (children 1)
      ExpressionList
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier test.hits
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier CounterID
      Literal UInt64_29103473
   SelectQuery (children 3)
    ExpressionList (children 1)
     Function count (children 1)
      ExpressionList
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier test.hits
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier CounterID
      Literal UInt64_1704509