[Xapian-discuss] Patch to enable numeric sorting in Omega using scriptindex

[Yevgeny Binder]

Here is a quick patch to perform numeric sorting instead of the  
default string sort in Omega 1.0.6. This must be decided at index  
time, and is specified by replacing VALUE= with NUMERIC= in the  
database spec file (this patch is for scriptindex only). A slightly  
better approach, other than redesigning Omega (or Xapian?) to allow  
setting the sort method at search time, would be to use NUMERIC as a  
flag that modifies the VALUE= action, but I was just looking for an  
easy hack. I hope to see this patch, or something like it, added to  
the next release.

- Yevgeny Binder


30a31
 > #include <sstream>
98c99
<     "truncate", "unhtml", "unique", "value", "weight"
---
 >     "numeric", "truncate", "unhtml", "unique", "value", "weight"
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< 	TRUNCATE, UNHTML, UNIQUE, VALUE, WEIGHT
---
 > 	NUMERIC, TRUNCATE, UNHTML, UNIQUE, VALUE, WEIGHT
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 > 		    case 'n':
 > 			if (action == "numeric") {
 > 			    code = Action::NUMERIC;
 > 			    arg = YES;
 > 			    takes_integer_argument = true;
 > 			}
 > 			break;
593a602,612
 > 		    case Action::NUMERIC:
 > 			if (!value.empty())
 > 			{
 > 				std::istringstream to_double(value);
 > 				double		value_double;
 > 				
 > 				to_double >> value_double;
 > 				
 > 			    doc.add_value(i->get_num_arg(),  
Xapian::sortable_serialise(value_double));
 > 			}
 > 			break;