CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType UInt8
   ColumnDeclaration b (children 2)
    DataType String
    Function plus (children 1)
     ExpressionList (children 2)
      Literal UInt64_1
      Literal UInt64_2
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
