CreateQuery t1 (children 4)
 Identifier t1
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration a (children 1)
    DataType UInt64
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Identifier number (alias a)
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier system.numbers
    Literal UInt64_100000