shizhengchao opened a new issue #7578: How to user BloomFilter in SQL
URL: https://github.com/apache/incubator-druid/issues/7578
 
 
   ### Description
   
   `SELECT BLOOM_FILTER(<expression>, <max number of entries>) FROM druid.foo 
WHERE dim2 = 'abc'`
   
   i want to know ,whant means `<expression>`? can you give a example? 

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