HPCC-11921 Create the correct node type from a readspill

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #6243 from ghalliday/issue11921

HPCC-11921 Create the correct node type from a readspill

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>