CreateQuery src (children 4)
 Identifier src
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration y (children 1)
    DataType Int8
 Storage definition (children 2)
  Function MergeTree
  Identifier y
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 1)
     Literal UInt64_1
