CreateQuery nullable_division (children 3)
 Identifier nullable_division
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration x (children 1)
    DataType UInt32
   ColumnDeclaration y (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType UInt32
   ColumnDeclaration a (children 1)
    DataType Decimal (children 1)
     ExpressionList (children 2)
      Literal UInt64_7
      Literal UInt64_2
   ColumnDeclaration b (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Decimal (children 1)
       ExpressionList (children 2)
        Literal UInt64_7
        Literal UInt64_2
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier x