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https://issues.apache.org/jira/browse/SPARK-26215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16707099#comment-16707099
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Takeshi Yamamuro commented on SPARK-26215:
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I found some useful documents about the reserved words;
https://developer.mimer.com/mimer-sql-standard-compliance/
https://developer.mimer.com/wp-content/uploads/2018/05/Standard-SQL-Reserved-Words-Summary.pdf
> define reserved keywords after SQL standard
> -------------------------------------------
>
> Key: SPARK-26215
> URL: https://issues.apache.org/jira/browse/SPARK-26215
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Wenchen Fan
> Priority: Major
>
> There are 2 kinds of SQL keywords: reserved and non-reserved. Reserved
> keywords can't be used as identifiers.
> In Spark SQL, we are too tolerant about non-reserved keywors. A lot of
> keywords are non-reserved and sometimes it cause ambiguity (IIRC we hit a
> problem when improving the INTERVAL syntax).
> I think it will be better to just follow other databases or SQL standard to
> define reserved keywords, so that we don't need to think very hard about how
> to avoid ambiguity.
> For reference: https://www.postgresql.org/docs/8.1/sql-keywords-appendix.html
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