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https://issues.apache.org/jira/browse/DRILL-2116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14297338#comment-14297338
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Julian Hyde commented on DRILL-2116:
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The following statement will be ambiguous if you make LEFT non-reserved:
{code}select * from t1 left join t2 rite on left.x = rite.y{code}
> Add non-reserved keywords to non-reserved keyword list in parser
> ----------------------------------------------------------------
>
> Key: DRILL-2116
> URL: https://issues.apache.org/jira/browse/DRILL-2116
> Project: Apache Drill
> Issue Type: Bug
> Components: SQL Parser
> Reporter: Jacques Nadeau
> Assignee: Aman Sinha
>
> There are a number of keywords in Drill that shouldn't be considered reserved
> when parsing. Calcite allows us to customize the list of un-reserved
> keywords and we should update the list to allow more words. Things that I've
> run across include value, user, left, etc.
> This is a very common usability problem.
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