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https://issues.apache.org/jira/browse/DRILL-3704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14720616#comment-14720616
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Daniel Barclay (Drill) commented on DRILL-3704:
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For determining the precedence (for documenting it):
The root of the expression hierarchy seems to be the non-terminal "<value
expression>" in the SQL specification's grammar. (It's at least the recursion
entry point, where <parenthesized value expression> leads back to <value
expression>.)
Traversing through grammar productions from that starting point, or Drill's
parser's grammar's equivalent, should reveal the precedence of operators and
other expression constructs in Drill.
> Document precedence of operators in Drill
> -----------------------------------------
>
> Key: DRILL-3704
> URL: https://issues.apache.org/jira/browse/DRILL-3704
> Project: Apache Drill
> Issue Type: Improvement
> Components: Documentation
> Reporter: Abhishek Girish
> Assignee: Kristine Hahn
>
> I couldn't find documentation of precedence of SQL operators in Apache Drill.
> If they aren't added already, we should include them similar to
> (1)
> https://docs.oracle.com/cd/E17952_01/refman-5.1-en/operator-precedence.html
> (2) https://msdn.microsoft.com/en-us/library/ms190276.aspx
> (3) https://dev.mysql.com/doc/refman/5.0/en/operator-precedence.html
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