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Xargin 2018-07-11 11:27:14 +08:00
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ch6-cloud/ch6-x-dist-search-engine.md
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@ -48,13 +48,11 @@ elasticsearch 是开源分布式搜索引擎的霸主，其依赖于 Lucene 实
对 es 中的数据进行查询时，本质就是求多个排好序的序列求交集。非数值类型字段涉及到分词问题，大多数内部使用场景下，我们可以直接使用默认的 bi-gram 分词。什么是 bi-gram 分词呢：
```
今天天气很好
+-------+ +-------+ +------+ +-------+ +--------+
| 今天 | | 天天 | | 天气 | | 气很 | | 很好 |
+-------+ +-------+ +------+ +-------+ +--------+
```
今天天气很好
+---------+ +---------+ +---------+ +---------+ +---------+
| 今天 | | 天天 | | 天气 | | 气很 | | 很好 |
+---------+ +---------+ +---------+ +---------+ +---------+
```