[teiid-issues] [JBoss JIRA] (TEIID-3722) Add an option to not widen comparisons to string
Steven Hawkins (JIRA)
issues at jboss.org
Mon Sep 28 06:53:00 EDT 2015
[ https://issues.jboss.org/browse/TEIID-3722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins resolved TEIID-3722.
-----------------------------------
Resolution: Done
Added a system property org.teiid.widenComparisonToString and updated the release notes / docs. We should consider having this default to false for Teiid 9.
> Add an option to not widen comparisons to string
> ------------------------------------------------
>
> Key: TEIID-3722
> URL: https://issues.jboss.org/browse/TEIID-3722
> Project: Teiid
> Issue Type: Quality Risk
> Components: Query Engine
> Reporter: Steven Hawkins
> Assignee: Steven Hawkins
> Fix For: 8.12
>
>
> Our resolving logic considers anything with an implicit conversion to string to be a valid widening conversion in a comparison. For example:
> int_col = '1a'
> will effectively become cast(int_col as string) = '1a'
> Or with timestamps:
> timestamp_col = '1970-01-01'
> becomes cast(timestamp_col as string) = '1970-01-01'
> In equality cases the optimizer will infer that the predicate is simply false, but when used with greater/less than comparison we'll still attempt the query with the widening conversion.
> This is most likely not the intent of the user. It would be best to provide an option that would allow an exception to be thrown rather than assuming a query that may not match the user's expectations.
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