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https://issues.apache.org/jira/browse/SPARK-28696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16905162#comment-16905162
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Sean Owen commented on SPARK-28696:
-----------------------------------
[~cloud_fan] may be a better contact. I guess Hive compatibility is a good
idea, and a DB named "_" sounds odd, but I don't know if there is another
standard that dictates what is supported. I think it could be OK to disallow
for 3.0 if there's a reason, as I highly doubt there are real user tables with
this DB name out there (?)
> create database _; allowing in Spark but Hive throws Parse Exception
> --------------------------------------------------------------------
>
> Key: SPARK-28696
> URL: https://issues.apache.org/jira/browse/SPARK-28696
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: ABHISHEK KUMAR GUPTA
> Priority: Minor
>
> In Spark
> spark-sql> create database _;
> Time taken: 0.062 seconds
> spark-sql> show databases;
> _
> adap
> adaptive
> adaptive_tc8
> In Hive
> 0: jdbc:hive2://10.18.98.147:21066/> create database _;
> Error: Error while compiling statement: FAILED: ParseException line 1:16
> cannot recognize input near '_--0' '<EOF>' '<EOF>' in create database
> statement (state=42000,code=40000)
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