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https://issues.apache.org/jira/browse/TINKERPOP-2605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17413091#comment-17413091
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ASF GitHub Bot commented on TINKERPOP-2605:
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spmallette merged pull request #1471:
URL: https://github.com/apache/tinkerpop/pull/1471
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> Further enforce and refine null semantics
> -----------------------------------------
>
> Key: TINKERPOP-2605
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2605
> Project: TinkerPop
> Issue Type: Improvement
> Components: process, test-suite
> Affects Versions: 3.5.1
> Reporter: Stephen Mallette
> Assignee: Stephen Mallette
> Priority: Major
>
> A number of areas where {{null}} is used in traversals result in some odd
> looking errors. Identify these situations and improve them to be more user
> friendly. Some specific items to take care of:
> {code}
> hasLabel(null) // currently results in exception, should just filter
> P.within(null) // TINKERPOP-2598
> sum() // NPE if null is present, should ignore nulls in calculation and
> return null if all values are null
> mean() // NPE if null is present, should ignore nulls in calculation and
> return null if all values are null
> max() // NPE if null is present, should ignore nulls in calculation and
> return null if all values are null
> min() // NPE if null is present, should ignore nulls in calculation and
> return null if all values are null
> inject(null) // NPE
> hasValue(null) // NPE if accidentally applied to hasValue(P), should just
> filter
> hasKey(null) // NPE, should just filter
> withSideEffect('k',null) // NPE, should just allow the assignment
> g.inject(1,null).as('a') // NPE and won't allow labelling
> path() // NPE when encountering nulls
> {code}
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