vthacker commented on a change in pull request #1559:
URL: https://github.com/apache/lucene-solr/pull/1559#discussion_r437848904



##########
File path: 
solr/core/src/test/org/apache/solr/search/TestReRankQParserPlugin.java
##########
@@ -645,5 +650,95 @@ public void testReRankQueriesWithDefType() throws 
Exception {
       );
     }
   }
+  
+  @Test
+  public void testMinExactCount() throws Exception {
+
+    assertU(delQ("*:*"));
+    assertU(commit());
+    
+    int numDocs = 200;
+    
+    for (int i = 0 ; i < numDocs ; i ++) {
+      assertU(adoc(
+          "id", String.valueOf(i),
+          "id_p_i", String.valueOf(i),
+          "field_t", IntStream.range(0, numDocs).mapToObj(val -> 
Integer.toString(val)).collect(Collectors.joining(" "))));
+    }
+    assertU(commit());
+    
+    ModifiableSolrParams params = new ModifiableSolrParams();
+    params.add("q", "field_t:0");
+    params.add("start", "0");
+    params.add("rows", "10");
+    params.add("fl", "id");
+    assertQ(req(params),
+        "*[count(//doc)=10]",
+        "//result[@numFound='" + numDocs + "']",
+        "//result[@numFoundExact='true']",
+        "//result/doc[1]/str[@name='id'][.='0']",
+        "//result/doc[2]/str[@name='id'][.='1']",
+        "//result/doc[3]/str[@name='id'][.='2']",
+        "//result/doc[4]/str[@name='id'][.='3']",
+        "//result/doc[5]/str[@name='id'][.='4']",
+        "//result/doc[6]/str[@name='id'][.='5']",
+        "//result/doc[7]/str[@name='id'][.='6']",
+        "//result/doc[8]/str[@name='id'][.='7']",
+        "//result/doc[9]/str[@name='id'][.='8']",
+        "//result/doc[10]/str[@name='id'][.='9']"
+        );
+    
+    params.add("rq", "{!"+ReRankQParserPlugin.NAME+" 
"+ReRankQParserPlugin.RERANK_QUERY+"=$rrq 
"+ReRankQParserPlugin.RERANK_DOCS+"=20}");
+    params.add("rrq", "id:10");
+    assertQ(req(params),
+        "*[count(//doc)=10]",
+        "//result[@numFound='" + numDocs + "']",
+        "//result[@numFoundExact='true']",
+        "//result/doc[1]/str[@name='id'][.='10']",
+        "//result/doc[2]/str[@name='id'][.='0']",
+        "//result/doc[3]/str[@name='id'][.='1']",
+        "//result/doc[4]/str[@name='id'][.='2']",
+        "//result/doc[5]/str[@name='id'][.='3']",
+        "//result/doc[6]/str[@name='id'][.='4']",
+        "//result/doc[7]/str[@name='id'][.='5']",
+        "//result/doc[8]/str[@name='id'][.='6']",
+        "//result/doc[9]/str[@name='id'][.='7']",
+        "//result/doc[10]/str[@name='id'][.='8']"
+        );
+    
+    params.add(CommonParams.MIN_EXACT_COUNT, "2");

Review comment:
       So we are allowed to set `MIN_EXACT_COUNT` < 
`ReRankQParserPlugin.RERANK_DOCS` ?
   
   In this case should we tell the re-rank collector to 
`ReRankQParserPlugin.RERANK_DOCS` ?




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