Hi Mike, Sorry for the delay. For some use cases, Fields are implemented by numeric values, but distinct values are not so big (<50 terms). We have a Search GUI, where user can add criteria on predefined fields. For those fields, where the number of terms is limited, then we proposed the available values in a dropdown.
What are your recommendations ? Using String instead of Numeric Values ? Thanks. Ludovic -----Original Message----- From: Michael McCandless [mailto:luc...@mikemccandless.com] Sent: jeudi, 22. septembre 2016 22:34 To: Lucene Users; Ludovic Bertin Subject: Re: Migration Lucene 4.7.0 -->6.0.1 - NumericUtils LegacyNumericUtils is the right solution for your index for now, but longer term you should migrate to dimensional points instead, which are a more efficient way to index and range search numerics. But: why do you need all distinct values of a field? In general this is a very dangerous method to offer. Mike McCandless http://blog.mikemccandless.com On Tue, Sep 20, 2016 at 9:02 AM, Ludovic Bertin <l.ber...@lombardodier.com> wrote: > Hi there, > > I'm migrating an application from Lucene 4.7.0 to Lucene 6.0.1. > I'm facing a problem with this piece of code : > > public List<Object> getDistinctValues(IndexReader reader, EventField field) > throws IOException { > > List<Object> values = new ArrayList<Object>(); > Fields fields = MultiFields.getFields(reader); > if (fields == null) return values; > > Terms terms = fields.terms(field.name()); > if (terms == null) return values; > > TermsEnum iterator = terms.iterator(); > > Class<? extends Object> type = field.getJavaType(); > BytesRef value = iterator.next(); > > while (value != null) { > if (type == Long.class) { > values.add(LegacyNumericUtils.prefixCodedToLong(value)); > } else if (type == Integer.class) { > values.add(LegacyNumericUtils.prefixCodedToInt(value)); > } else if (type == Boolean.class) { > values.add(LegacyNumericUtils.prefixCodedToInt(value) == 1 ? TRUE > : FALSE); > } else if (type == Date.class) { > values.add(new Date(LegacyNumericUtils.prefixCodedToLong(value))); > } else if (type == String.class) { > values.add(value.utf8ToString()); > } else { > log.warn("getDistinctValues: ignoring field " + field + " of type > " + type); > } > > value = iterator.next(); > } > > return values; > } > > The aim of this method is to get all terms present in a field directly in the > correct java type. I'm seeing just now that NumericUtils is an internal > class, so I should not have used it. > For now, I can use LegacyNumericUtils, but that's a very temporary solution. > > What is the best approach to achieve my goal ? > > Thanks in advance for any help. > Ludovic > > ************************ DISCLAIMER ************************ > This message is intended only for use by the person to > whom it is addressed. It may contain information that is > privileged and confidential. Its content does not constitute > a formal commitment by Bank Lombard Odier & Co Ltd or any > of its branches or affiliates. If you are not the intended recipient > of this message, kindly notify the sender immediately and > destroy this message. Thank You. > ***************************************************************** [[ rethink everything. ]]<http://www.lombardodier.com> DISCLAIMER ********************************************** This message is intended only for use by the person to whom it is addressed. It may contain information that is privileged and confidential. Its content does not constitute a formal commitment by Bank Lombard Odier & Co Ltd or any of its branches or affiliates. If you are not the intended recipient of this message, kindly notify the sender immediately and destroy this message. Thank You. ***************************************************************
