Harpsichord1207 opened a new issue #10029:
URL: https://github.com/apache/druid/issues/10029
### Affected Version
Druid 0.13.0
### Description
I use csv in aws s3 as lookup table, when query a lookuped dimension, the
log reported `java.lang.NullPointerException: Lookup [advertiser_lookup_table]
not found`
but I can get response from
`/druid/coordinator/v1/lookups/config/__default/advertiser_lookup_table`, which
gets
```
{"version":"v0","lookupExtractorFactory":{"type":"cachedNamespace","extractionNamespace":{"fileRegex":".*csv","uriPrefix":"s3://XXX/data/metadata/20200609/XXX/","type":"uri","namespaceParseSpec":{"valueColumn":"advertiser","keyColumn":"advertiserID","columns":["advertiserID","advertiser","campaignID","campaign","siteID","site","placementID","placement","adSection","adFormLoc","adCreativity","adSize","purchaseUnit","adCarModelName","adGoal","hasEstimatedImp","hasEstimatedClick","impressionMonitoring","clickMonitoring","activityMonitoring"],"format":"csv"},"pollPeriod":"PT5M"}}}
```
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