[jira] [Commented] (VELOCITY-979) Performance issue with comparing strings in Velocity

    [ https://issues.apache.org/jira/browse/VELOCITY-979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17822503#comment-17822503 ] 

Michael Osipov commented on VELOCITY-979:
-----------------------------------------

Can you come up with a patch and a test?

> Performance issue with comparing strings in Velocity
> ----------------------------------------------------
>
>                 Key: VELOCITY-979
>                 URL: https://issues.apache.org/jira/browse/VELOCITY-979
>             Project: Velocity
>          Issue Type: Improvement
>          Components: Engine
>    Affects Versions: 2.3
>            Reporter: Alex
>            Priority: Major
>
> Most Velocity compare expressions eventually use ASTComparisonNode which at first attempts to treat data types as numbers:
>  
> Boolean result = compareNumbers(left, right);
> if (result == null)
> {
> result = compareNonNumber(left, right);
> }
>  
> There is fairly large overhead when attempting to create BigDecimal from non-numeric strings used in comparison in the DuckType.asNumber:
>  
> if (coerceType)
> {
> String string = asString(value);// coerce to string
> if (string != null)
> {
> return new BigDecimal(string);
> }
> }
>  
> The exception is created capturing stack, etc. On large volume of compare operations it's very visible.
>  



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