CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration a (children 1)
    DataType UInt8
   ColumnDeclaration b (children 1)
    DataType UInt8
   ColumnDeclaration c (children 2)
    DataType UInt16
    Function plus (children 1)
     ExpressionList (children 2)
      Identifier a
      Identifier b
 Storage definition (children 2)
  Function MergeTree
  Identifier a