all:
person_module/1 DateTime('1979/09/13') young
person_module/2 DateTime('1939/12/03') old
young:
person_module/1 DateTime('1979/09/13') young
1939/12/03:
person_module/1 DateTime('1979/09/13') young
person_module/2 DateTime('1939/12/03') old
src for birth_name:
SELECT DISTINCT
   catalog.path,   catalog.uid    
FROM
   catalog AS catalog, persondata AS persondata    
WHERE 
  1 = 1 
  AND (persondata.birth_name = 'old') AND (catalog.portal_type = 'Person') AND (((catalog.security_uid IN ('1', '2', '3', '4', '5', '6', '7', '9')) OR (((catalog.owner = 'zope'))))) AND (catalog.uid = persondata.uid)
LIMIT 1000

src for normal start_date:
SELECT DISTINCT
   catalog.path,   catalog.uid    
FROM
   catalog AS catalog    
WHERE 
  1 = 1 
  AND (((catalog.security_uid IN ('1', '2', '3', '4', '5', '6', '7', '9')) OR (((catalog.owner = 'zope'))))) AND (catalog.portal_type = 'Person') AND (1)
LIMIT 1000

src for prefixed start_date:
SELECT DISTINCT
   catalog.path,   catalog.uid    
FROM
   catalog AS catalog, persondata AS persondata    
WHERE 
  1 = 1 
  AND (((catalog.security_uid IN ('1', '2', '3', '4', '5', '6', '7', '9')) OR (((catalog.owner = 'zope'))))) AND (catalog.portal_type = 'Person') AND (persondata.start_date = '1939/12/03') AND (catalog.uid = persondata.uid)
LIMIT 1000

data for prefixed start_date: