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      2. Lucene不是空查询?

        Lucene not null query?(Lucene不是空查询?)

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                  本文介绍了Lucene不是空查询?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我们如何构造一个查询来搜索不为空的特定字段?

                  How can we construct a query to search for particular field to be not null?

                  field_name:* 不起作用.我试过 field_name:[a* to z*] 这适用于英语,但不涵盖所有语言.

                  field_name:* is not working. I tried field_name:[a* to z*] this works fine for English, but does not cover all languages.

                  还有其他建议吗?

                  推荐答案

                  目前 Lucene 不支持.请参阅 this 进行讨论.

                  This is currently not supported by Lucene. See this for a discussion.

                  另一种选择可能是将一些预定义的字符串(如 nullnullnullnull)存储为字段值(如果它为空).然后您可以使用否定过滤器来删除这些记录.(我不太喜欢这个,但想不出更好的选择)

                  An alternative option may be to store some pre-defined string (like nullnullnullnull) as the field value if it is null. Then you can use a negative filter to remove these records. (I don't like this much, but can't think of a better option)

                  这篇关于Lucene不是空查询?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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