dsmiley commented on code in PR #4369:
URL: https://github.com/apache/solr/pull/4369#discussion_r3192929931


##########
solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java:
##########
@@ -133,6 +133,7 @@
  */
 public class QueryComponent extends SearchComponent {
   public static final String COMPONENT_NAME = "query";
+  private static final String FIELD_EXISTS_QUERY_REQUIRES_PREFIX = 
"FieldExistsQuery requires";

Review Comment:
   just inline this please; the constant isn't useful



##########
solr/core/src/test/org/apache/solr/handler/component/QueryComponentFieldExistsQueryErrorHandlingTest.java:
##########
@@ -0,0 +1,106 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.handler.component;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import org.apache.solr.SolrTestCaseJ4;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.request.SolrQueryRequest;
+import org.apache.solr.response.SolrQueryResponse;
+import org.apache.solr.search.QueryCommand;
+import org.apache.solr.search.SolrIndexSearcher;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+public class QueryComponentFieldExistsQueryErrorHandlingTest extends 
SolrTestCaseJ4 {

Review Comment:
   I don't trust Mocking to reflect the real world we want, not to mention it 
can be rather invasive as this test shows.  And invasiveness leads to a bigger 
maintenance burden over time.  Can you not provoke the problem as reported in a 
realistic test?  I can try to help if needed or we just provoke it in a manual 
way and not even have an automated test.  It's questionable if the problem is 
worth an extensive test.



##########
solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java:
##########
@@ -435,6 +436,9 @@ public void process(ResponseBuilder rb) throws IOException {
         }
       } catch (SyntaxError e) {
         throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, e);
+      } catch (IllegalStateException e) {
+        maybeThrowBadRequestForFieldExistsQueryFailure(e);
+        throw e;

Review Comment:
   copilot is rightfully suspicious.



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