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https://issues.apache.org/jira/browse/IOTDB-430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17049995#comment-17049995
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Julian Feinauer commented on IOTDB-430:
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Agree with [~haonan] here. In an RDBMS the query is different for count(*) and
for count(1) and in our case it would be equal (and as pointed out by [~haonan]
it would be ambigious with a count on a specific series). So I would opt for
not implementing this.
> using star to get records count is poor efficiency than using integer
> ---------------------------------------------------------------------
>
> Key: IOTDB-430
> URL: https://issues.apache.org/jira/browse/IOTDB-430
> Project: Apache IoTDB
> Issue Type: Improvement
> Reporter: lming
> Priority: Major
>
> when I want to get records count in postgresql and other relational database
> , I will using form of count(1) for high efficiency than count(*)
> But in release 0.9.0 I only could get count by star .
> select count(*) is poor efficiency than select count(1)
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