CreateQuery lc_nullable_string (children 3)
 Identifier lc_nullable_string
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration c1 (children 2)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType Nullable (children 1)
       ExpressionList (children 1)
        DataType String
    Function CAST (children 1)
     ExpressionList (children 2)
      Literal NULL
      Literal \'LowCardinality(Nullable(String))\'
 Storage definition (children 1)
  Function Memory
