LuceneNotes » History » Version 9
Andreas Kohlbecker, 09/23/2013 12:09 PM
| 1 | 1 | Andreas Kohlbecker | |
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| 2 | # Various notes and links on Lucene |
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| 5 | {{>toc}} |
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| 10 | ### Joins in Lucene |
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| 13 | 2 | Andreas Kohlbecker | |
| 14 | #### joins using BlockJoinQuery |
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| 16 | 1 | Andreas Kohlbecker | * possible since v3.4.0 |
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| 18 | * http://blog.mikemccandless.com/2012/01/searching-relational-content-with.html |
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| 19 | 2 | Andreas Kohlbecker | |
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| 21 | 3 | Andreas Kohlbecker | |
| 22 | #### joins using the JoinUtil |
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| 23 | 2 | Andreas Kohlbecker | |
| 24 | 1 | Andreas Kohlbecker | |
| 25 | is slower than BlockJoinQuery but seems more flexible and does not require special indexing |
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| 27 | 4 | Andreas Kohlbecker | |
| 28 | * possisble since 3.6, 4.0-ALPHA |
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| 30 | * https://issues.apache.org/jira/browse/LUCENE-3602 |
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| 31 | 5 | Andreas Kohlbecker | |
| 32 | * http://lucene.apache.org/core/3_6_2/api/all/org/apache/lucene/search/join/JoinUtil.html |
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| 37 | ### Filters |
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| 40 | 7 | Andreas Kohlbecker | |
| 41 | #### General rules |
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| 43 | * I you are using multiple filters, place these filters inside of a Boolean Filter. The Boolean Filter internally benefits from the BitSets produced by Filters. |
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| 45 | 9 | Andreas Kohlbecker | * If you need to use And/Or/Not Filters, your “heaviest” filter should always be placed last – typically Geo filters since they can perform some heavy computations to determine distance. |
| 46 | 7 | Andreas Kohlbecker | |
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| 49 | #### Links to docs |
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| 51 | 6 | Andreas Kohlbecker | * on bitsets and filters: http://www.elasticsearch.org/blog/all-about-elasticsearch-filter-bitsets/ |