Stanislav Livotov created SOLR-13720:
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Summary: Impossible to create effective ToParenBlockJoinQuery in
custom QParser
Key: SOLR-13720
URL: https://issues.apache.org/jira/browse/SOLR-13720
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Stanislav Livotov
According to Solr
[ducumentation|[https://cwiki.apache.org/confluence/display/solr/SolrPlugins#SolrPlugins-QParserPlugin]]
QParser is treated as a legal plugin.
However, it is impossible to create an effective ToParentBlockJoin query
without copy-pasting(BitDocIdSetFilterWrapper class and getCachedFilter method
from BlockJoinParentQParser) or dirty hacks(like creating
org.apache.solr.search.join package with some accessor method to
package-private methodsin plugin code and adding it it WEB-INF/lib directory in
order to be loaded by the same ClassLoader).
I don't see a truly clean way how to fix it, but at least we can help custom
plugin developers to create it a little bit easier by making
BlockJoinParentQParser#getCachedFilter public and
BlockJoinParentQParser#BitDocIdSetFilterWrapper and providing getter for
BitDocIdSetFilterWrapper#filter.
In order to create
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