Explain EXPLAIN (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 5)
    ExpressionList (children 2)
     Identifier _table
     Function count (children 1)
      ExpressionList
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier test_03217_all_replicas
    Function and (children 1)
     ExpressionList (children 2)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier _table
        Literal \'test_03217_merge_replica_1\'
      Function greaterOrEquals (children 1)
       ExpressionList (children 2)
        Identifier x
        Literal UInt64_0
    ExpressionList (children 1)
     Identifier _table
    Set
