CreateQuery mass_table_312 (children 3)
 Identifier mass_table_312
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration d (children 2)
    DataType Date
    Literal \'2000-01-01\'
   ColumnDeclaration x (children 1)
    DataType UInt64
   ColumnDeclaration n (children 1)
    DataType Nested (children 1)
     ExpressionList (children 2)
      NameTypePair a (children 1)
       DataType String
      NameTypePair b (children 1)
       DataType String
 Storage definition (children 1)
  Function MergeTree (children 1)
   ExpressionList (children 3)
    Identifier d
    Identifier x
    Literal UInt64_1