CreateQuery test_table_nullable (children 4)
 Identifier test_table_nullable
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration key (children 1)
    DataType UInt64
   ColumnDeclaration value (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType UInt16
 Storage definition (children 1)
  Function Memory (children 1)
   ExpressionList
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 2)
     Identifier number
     Function if (children 1)
      ExpressionList (children 3)
       Function equals (children 1)
        ExpressionList (children 2)
         Function modulo (children 1)
          ExpressionList (children 2)
           Identifier number
           Literal UInt64_2
         Literal UInt64_0
       Literal NULL
       Identifier number
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Function numbers (children 1)
        ExpressionList (children 1)
         Literal Float64_100000