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Posted to dev@lucenenet.apache.org by GitBox <gi...@apache.org> on 2022/04/15 08:10:48 UTC
[GitHub] [lucenenet] bbieniek opened a new issue, #632: Cannot parse 'XX*': Encountered ""
bbieniek opened a new issue, #632:
URL: https://github.com/apache/lucenenet/issues/632
Hi,
We are right now on the following versions:
```
<PackageReference Include="Lucene.Net" Version="4.8.0-beta00016" />
<PackageReference Include="Lucene.Net.QueryParser" Version="4.8.0-beta00016" />
```
Today, we have encountered a random error, that could not be reproduced:
```
Cannot parse 'Bl*': Encountered "<EOF>" at line 1, column 18.
Was expecting one of:
<BAREOPER> ...
"(" ...
"*" ...
<QUOTED> ...
<TERM> ...
<PREFIXTERM> ...
<WILDTERM> ...
<REGEXPTERM> ...
"[" ...
"{" ...
<NUMBER> ...
<TERM> ...
"*" ...
```
We use MultiFieldQueryParser with two fields and the following call:
`Parse($"{input}*")`
What could be the cause of it?
The data is read from Azure Blob storage, using AzureDirectory package.
Thank you for your help.
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[GitHub] [lucenenet] NightOwl888 commented on issue #632: Cannot parse 'XX*': Encountered ""
Posted by GitBox <gi...@apache.org>.
NightOwl888 commented on issue #632:
URL: https://github.com/apache/lucenenet/issues/632#issuecomment-1100187973
What datatype is `{input}`?
I suspect you might be having parse issues due to the culture of the current thread in your application, which may be formatting `{input}` in an unexpected way. You may need to use [`FormattableString.Invariant()`](https://docs.microsoft.com/en-us/dotnet/api/system.formattablestring.invariant?view=net-6.0).
Note also that the parsing may be failing because a new `QueryParser` instance uses the culture of the current thread by default and you may need to change the culture.
```c#
var parser = new MultiFieldQueryParser(LuceneVersion.LUCENE_48, new string[] { "foo", "bar" }, analyzer)
{
Locale = CultureInfo.InvariantCulture
};
```
Whatever the case, you should be able to debug what is happening by recording the culture and value to be parsed during a failure and then you should reproduce the issue in a debug environment so you can step through to debug. Note that you can [enable Source Link](https://lucenenet.apache.org/docs/4.8.0-beta00016/api/core/source-stepping.html) on 4.8.0-beta00016 so you can step into the QueryParser code also.
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[GitHub] [lucenenet] bbieniek commented on issue #632: Cannot parse 'XX*': Encountered ""
Posted by GitBox <gi...@apache.org>.
bbieniek commented on issue #632:
URL: https://github.com/apache/lucenenet/issues/632#issuecomment-1104820839
After deploying the fix, it did not help.
Still getting the exception:
```
Cannot parse '"a"': Encountered "<EOF>" at line 1, column 2.
Was expecting one of:
<NOT> ...
"+" ...
"-" ...
<BAREOPER> ...
"(" ...
"*" ...
<QUOTED> ...
<TERM> ...
<PREFIXTERM> ...
<WILDTERM> ...
<REGEXPTERM> ...
"[" ...
"{" ...
<NUMBER> ...
<TERM> ...
"*" ...
```
One more thing, I am using the AzureDirectory package. I have noticed that this *may* occur when the cache is being downloaded from a blob container. I will ask the person that takes care of the Lucene.Net.Store.AzureDirectory package
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[GitHub] [lucenenet] bbieniek commented on issue #632: Cannot parse 'XX*': Encountered ""
Posted by GitBox <gi...@apache.org>.
bbieniek commented on issue #632:
URL: https://github.com/apache/lucenenet/issues/632#issuecomment-1100190923
It's a string.
The problem is that this happened just in one instance. I wasn't able to reproduce it when running the parsing on exactly the same string.
Thanks for the tip regarding Locale, I will try that and see if the error repeats
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