minh truong created SOLR-11236:
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             Summary: Facet allow paging and make bucketSizeLimit as optional 
parameter
                 Key: SOLR-11236
                 URL: https://issues.apache.org/jira/browse/SOLR-11236
             Project: Solr
          Issue Type: New Feature
      Security Level: Public (Default Security Level. Issues are Public)
          Components: streaming expressions
    Affects Versions: 6.6
            Reporter: minh truong


FacetStream in streaming expression do not have paging capability and do not 
have the ability to retrieve all the facet.

To resolve the bucketSizeLimit to be optional: 
    1. The 
"\lucene-solr\solr\solrj\src\java\org\apache\solr\client\solrj\io\stream\FacetStream.java"
 the constructor with StreamExpression parameters, comment out the checking of 
limit must be greater zero and when it is exception assign a negative value to 
bucketSizeLimit.
    2. The method read() update the logic to "if(index < tuples.size() && 
(index < bucketSizeLimit || bucketSizeLimit <= 0))" 

To add paging to facetStream:
    1. create a private variable call startAt as int (dafault 0).
    2. retrieve the value from StreamExpression variable and start the value to 
startAt.
    3. overwrite the method writeMap from tupleStream and in the method in the 
try catch before the for loop. Set index with startAt and set bucketSizeLimit 
to bucketSizeLimit plus startAt if(bucketSizeLimit is a positive integer).



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