> switching is done in Solr on field.hasDocValues. The code would be amended > to (field.hasDocValues && field.useDocValues) throughout. >
This is correct. Currently we use DocValues if they are available, and to check the availabilty we check the schema attribute. This can be problematic in the scenarios you described ( for example half the index has docValues for a field and the other half not yet ). Your proposal is interesting. Technically it should work and should allow transparent migration from not docValues to docValues. But it is a risky one, because we are decreasing the readability a bit ( althought a user will specify the attribute only in special cases like yours) . The only problem I see is that the same discussion we had for docValues actually applies to all other invasive schema changes : 1) you change the field type 2) you enable or disable term vectors 3) you enable/disable term positions,offsets ect ect So basically this is actually a general problem, that probably would require a general re-think . So although can be a quick fix that will work, I fear can open the road to messy configuration attributes. Cheers -- -------------------------- Benedetti Alessandro Visiting card : http://about.me/alessandro_benedetti "Tyger, tyger burning bright In the forests of the night, What immortal hand or eye Could frame thy fearful symmetry?" William Blake - Songs of Experience -1794 England
