[teiid-issues] [JBoss JIRA] (TEIID-3722) Add an option to not widen comparisons to string

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-3722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins closed TEIID-3722.
---------------------------------


> 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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