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| -rw-r--r-- | topics/xapian-search-queries.gmi | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/topics/xapian-search-queries.gmi b/topics/xapian-search-queries.gmi index 0364344..74966f7 100644 --- a/topics/xapian-search-queries.gmi +++ b/topics/xapian-search-queries.gmi @@ -90,3 +90,25 @@ Alternatively, this same query may be expressed using kilo or mega suffixes. Hs:chr4:9130k..9980k species:mouse Hs:chr4:9.13M..9.98M species:mouse ``` + +## Gotchas + +### Pure `NOT` queries are not supported + +Due to +=> https://xapian.org/docs/apidoc/html/classXapian_1_1QueryParser.html#ae96a58a8de9d219ca3214a5a66e0407eacafc7c8cf7c90adac0fc07d02125aed0 performance reasons, +pure `NOT` queries are not supported. + +A search such as: + +``` +NOT author:hager +``` + +will fail. + +You will need to add something to the query to prevent the error, e.g. + +``` +species:mouse NOT author:hager +``` |