CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration t (children 1)
    DataType Tuple (children 1)
     ExpressionList (children 2)
      NameTypePair a (children 1)
       DataType UInt64
      NameTypePair b (children 1)
       DataType Array (children 1)
        ExpressionList (children 1)
         DataType Tuple (children 1)
          ExpressionList (children 2)
           NameTypePair c (children 1)
            DataType UInt64
           NameTypePair d (children 1)
            DataType UInt64
 Storage definition (children 3)
  Function MergeTree
  Identifier id
  Set
