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https://issues.apache.org/jira/browse/LUCENE-7609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15799061#comment-15799061
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Adrien Grand commented on LUCENE-7609:
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Also this change seems to be changing expression values to not have a value if
any of the sub sources does not have a value while in the past it looks like
all documents would have a value and we would treat sub sources that do not
have a value as zero. I think we should either preserve this behaviour or
document the new one?
> Refactor expressions module to use DoubleValuesSource
> -----------------------------------------------------
>
> Key: LUCENE-7609
> URL: https://issues.apache.org/jira/browse/LUCENE-7609
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Attachments: LUCENE-7609.patch
>
>
> With DoubleValuesSource in core, we can refactor the expressions module to
> use these instead of ValueSource, and remove the dependency of expressions on
> the queries module in master.
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