benkrug opened a new issue #11145:
URL: https://github.com/apache/druid/issues/11145
A select count(*) will return nothing rather than 0, if no rows pass the
WHERE conditions.
Eg, load wikipedia.
`select count(*) from wikipedia` - returns 24433 (for me, in my load)
`select count(*) from wikipedia where channel = 'abc'` - returns nothing,
not 0.
This is true running in the console, or using the API. There I get
`[{"EXPR$0":24433}]` for the first query, and `[]` for the second.
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