CreateQuery join_test (children 3)
 Identifier join_test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType Int64
   ColumnDeclaration y (children 1)
    DataType UInt64
 Storage definition (children 2)
  Function MergeTree
  Identifier id
