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https://issues.apache.org/jira/browse/SOLR-16810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17817924#comment-17817924
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Eric Pugh commented on SOLR-16810:
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I like your suggestion [~janhoy]! If you created two new JIRA's to reflect
each of the bullets that you suggested (and I think the work can be done in
separate pieces), and link them to this JIRA, then could we go ahead and close
this JIRA and the associated PR as "Won't Do"?
> Under certain situations Solr produces managed schema XML that cannot be
> loaded
> -------------------------------------------------------------------------------
>
> Key: SOLR-16810
> URL: https://issues.apache.org/jira/browse/SOLR-16810
> Project: Solr
> Issue Type: Bug
> Components: Schema and Analysis
> Affects Versions: 9.2.1
> Reporter: Thiruvalluvan M. G.
> Assignee: Eric Pugh
> Priority: Major
> Time Spent: 40m
> Remaining Estimate: 0h
>
> While persisting the {{ManagedIndexSchema}} as XML, non-printable characters
> in field names get escaped as {{{}#nn;{}}}, where {{nn}} is the decimal
> representation of the non-printable character. For example, if the field name
> has the byte {{{}0x14{}}}, it gets escaped as {{{}#20;{}}}. This in
> indistinguishable from the literal {{#20;}} in the field name. If we have two
> fields - one with the non-printable character and the other with the literal
> string, two fields get generated with the same name. Loading the resulting
> XML, naturally, causes an exception. To fix this, any occurrence of literal
> {{#}} in the field name should be escaped, with say {{{}##{}}}.
> A second problem is that while escaping happens when generating XML, the
> corresponding unescaping does not happen on loading it. This asymmetry should
> be fixed as well.
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