SOLR-11316: date support for min/max, fix missing bug for int/long fields

solr/CHANGES.txt

@@ -86,6 +86,9 @@ New Features
 * SOLR-11317: JSON Facet API: min/max aggregations on numeric fields are now typed better so int/long
   fields return an appropriate integral type rather than a double. (yonik)
 
+* SOLR-11316: JSON Facet API: min/max aggregations are now supported on single-valued date fields.
+  (yonik)
+
 
 Bug Fixes
 ----------------------

solr/core/src/java/org/apache/solr/search/facet/MinMaxAgg.java

@@ -18,6 +18,7 @@ package org.apache.solr.search.facet;
 
 import java.io.IOException;
 import java.util.Arrays;
+import java.util.Date;
 
 import org.apache.lucene.index.LeafReaderContext;
 import org.apache.lucene.index.MultiDocValues;
@@ -70,8 +71,9 @@ public class MinMaxAgg extends SimpleAggValueSource {
           return new DFuncAcc(vs, fcontext, numSlots);
         case INTEGER:
         case LONG:
-        case DATE:
           return new LFuncAcc(vs, fcontext, numSlots);
+        case DATE:
+          return new DateFuncAcc(vs, fcontext, numSlots);
       }
     }
 
@@ -185,7 +187,7 @@ public class MinMaxAgg extends SimpleAggValueSource {
     @Override
     public Object getValue(int slot) {
       long val = result[slot];
-      if (val == 0 && exists.get(slot)) {
+      if (val == 0 && !exists.get(slot)) {
         return null;
       } else {
         return val;
@@ -221,6 +223,31 @@ public class MinMaxAgg extends SimpleAggValueSource {
 
   }
 
+  class DateFuncAcc extends LongFuncSlotAcc {
+    private static final long MISSING = Long.MIN_VALUE;
+    public DateFuncAcc(ValueSource values, FacetContext fcontext, int numSlots) {
+      super(values, fcontext, numSlots, MISSING);
+    }
+
+    @Override
+    public void collect(int doc, int slotNum) throws IOException {
+      long val = values.longVal(doc);
+      if (val == 0 && !values.exists(doc)) return; // depend on fact that non existing values return 0 for func query
+
+      long currVal = result[slotNum];
+      if (Long.compare(val, currVal) * minmax < 0 || currVal == MISSING) {
+        result[slotNum] =  val;
+      }
+    }
+
+    // let compare be the default for now (since we can't yet correctly handle sortMissingLast
+
+    @Override
+    public Object getValue(int slot) {
+      return result[slot] == MISSING ? null : new Date(result[slot]);
+    }
+  }
+
 
   abstract class OrdAcc extends SlotAcc {
     final static int MISSING = -1;

solr/core/src/test/org/apache/solr/search/facet/TestJsonFacets.java

@@ -695,11 +695,29 @@ public class TestJsonFacets extends SolrTestCaseHS {
             "}"
         )
         , "facets=={count:6 " +
-            ",f1:{ buckets:[{val:-1,count:2,a:-5},{val:3,count:2,a:-5},{val:-5,count:1,a:2},{val:2,count:1,a:2},{val:0,count:2,a:3}, ] } " +
-            ",f2:{ buckets:[{val:0,count:2,a:7},{val:3,count:2,a:3},{val:-5,count:1,a:2},{val:2,count:1,a:2},{val:-1,count:2,a:-5}, ] } " +
+            ",f1:{ buckets:[{val:-1,count:2,a:-5},{val:3,count:2,a:-5},{val:-5,count:1,a:2},{val:2,count:1,a:2},{val:0,count:2,a:3} ] } " +
+            ",f2:{ buckets:[{val:0,count:2,a:7},{val:3,count:2,a:3},{val:-5,count:1,a:2},{val:2,count:1,a:2},{val:-1,count:2,a:-5} ] } " +
             "}"
     );
 
+
+    // Same thing for dates
+    // test min/max of string field
+    if (date.equals("date_dt") || date.equals("date_dtd")) {  // supports only single valued currently...
+      client.testJQ(params(p, "q", "*:*"
+          , "json.facet", "{" +
+              " f3:{${terms}  type:field, field:${num_is}, facet:{a:'min(${date})'}, sort:'a desc' }" +
+              ",f4:{${terms}  type:field, field:${num_is}, facet:{a:'max(${date})'}, sort:'a asc' }" +
+              "}"
+          )
+          , "facets=={count:6 " +
+              ",f3:{ buckets:[{val:-1,count:2,a:'2002-02-02T02:02:02Z'},{val:3,count:2,a:'2002-02-02T02:02:02Z'},{val:0,count:2,a:'2001-02-03T01:02:03Z'},{val:-5,count:1,a:'2001-01-01T01:01:01Z'},{val:2,count:1,a:'2001-01-01T01:01:01Z'} ] } " +
+              ",f4:{ buckets:[{val:-5,count:1,a:'2001-01-01T01:01:01Z'},{val:2,count:1,a:'2001-01-01T01:01:01Z'},{val:-1,count:2,a:'2002-03-01T03:02:01Z'},{val:0,count:2,a:'2003-03-03T03:03:03Z'},{val:3,count:2,a:'2003-03-03T03:03:03Z'} ] } " +
+              "}"
+      );
+    }
+
+
     // percentiles 0,10,50,90,100
     // catA: 2.0 2.2 3.0 3.8 4.0
     // catB: -9.0 -8.2 -5.0 7.800000000000001 11.0