FYI: if there's only one fieled you have to (occasionally) worry about being absent from all docs, you can circumvent the whole issue (and avoid needing to patch) by using a TermEnum to check if you date field has any values before doing the search, if not - sort on something else.
: Date: Tue, 28 Jun 2005 11:02:27 -0400 : From: Chris D <[EMAIL PROTECTED]> : Reply-To: java-user@lucene.apache.org, Chris D <[EMAIL PROTECTED]> : To: java-user@lucene.apache.org : Subject: Sorting on an occasionally empty field : : Hello, : : I'm indexing one lucene document in a couple of steps, For a short : period of time the sorted field (a date in this case) may be empty, : depending on the order the files are indexed. It's perfectly : acceptable (and likely ideal) for that document to not be returned. : There are other cases where I would like to sort on a field that isn't : always present. : : This has been dicussed before in bug 34477 : (http://issues.apache.org/bugzilla/show_bug.cgi?id=34477). : : I was wondering is this going to be implemented in 1.9/2.0? : : I tried implementing the template patch to all of the places in : FieldCacheImpl to see how that works, and got snagged on getAuto(). : (see starred lines) : : public Object getAuto (IndexReader reader, String field) : throws IOException { : field = field.intern(); : Object ret = lookup (reader, field, SortField.AUTO); : if (ret == null) { : TermEnum enumerator = reader.terms (new Term (field, "")); : try { : Term term = enumerator.term(); : if (term == null) { : /*********I'm pretty sure this one doesn't matter*********/ : throw new RuntimeException ("no terms in field " + field + " : - cannot determine sort type"); : } : if (term.field() == field) { : String termtext = term.text().trim(); : : // Java 1.3 level code: : try { : Integer.parseInt (termtext); : ret = getInts (reader, field); : } catch (NumberFormatException nfe1) { : try { : Float.parseFloat (termtext); : ret = getFloats (reader, field); : } catch (NumberFormatException nfe2) { : ret = getStringIndex (reader, field); : } : } : if (ret != null) { : store (reader, field, SortField.AUTO, ret); : } : } else { : throw new RuntimeException ("field \"" + field + "\" does : not appear to be indexed"); : /***************What should be returned here??******************/ : } : } finally { : enumerator.close(); : } : : } : return ret; : } : : : Any suggestions? : : Thanks, : Chris : : --------------------------------------------------------------------- : To unsubscribe, e-mail: [EMAIL PROTECTED] : For additional commands, e-mail: [EMAIL PROTECTED] : -Hoss --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
