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https://issues.apache.org/jira/browse/DRILL-2443?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kristine Hahn resolved DRILL-2443.
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Resolution: Fixed
Rules about implicit casting are posted on the Drill wiki and ready for review:
http://drill.apache.org/docs/data-types/#implicit-casting
> Document implicit casting rules
> -------------------------------
>
> Key: DRILL-2443
> URL: https://issues.apache.org/jira/browse/DRILL-2443
> Project: Apache Drill
> Issue Type: Improvement
> Components: Documentation
> Reporter: Victoria Markman
> Assignee: Kristine Hahn
>
> This document should describe the implicit casting rules in different
> operations: joins, "union all" and functions.
> For example,
> if t1.a1 is defined as an INTEGER and t2.a2 is defined as BIGINT, using these
> two columns in a join predicate will result in t1.a1 to be converted to
> BIGINT implicitly and explicit cast will not be needed:
> select * from t1, t2 where t1.a1 = t2.a2;
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