[teiid-issues] [JBoss JIRA] (TEIID-1600) Exact numeric issues

[Steven Hawkins (Commented) (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-1600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646968#comment-12646968 ] 

Steven Hawkins commented on TEIID-1600:
---------------------------------------

Changed org.teiid.parseDecimalAsDouble to org.teiid.decimalAsDouble so that it can cover backwards compatibility for AVG as well.
                
> Exact numeric issues
> --------------------
>
>                 Key: TEIID-1600
>                 URL: https://issues.jboss.org/browse/TEIID-1600
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 6.0.0
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 8.0
>
>
> Teiid diverges from the SQL spec by parsing numerical expressions of the form <integral value>.<integral value> as doubles rather than as an exact numeric type (which for us would be BigDecimal).  I believe this was originally done to match Java parsing semantics and potentially to avoid performance overhead of using BigBecimal.  However this can lead to a loss of precision that is not expected by ANSI SQL.
> inexact numeric values entered in scientific notation would not be affected by this change.  They would still be parsed as doubles.
> The SQL spec also requires that the result of AVG on an exact type be returned as an exact type (although precision and scale are implementation dependent).

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