fixed MAX aggregation for negative double values

common/script/script-api/src/main/java/org/thingsboard/script/api/tbel/TbelCfTsRollingArg.java

@@ -73,7 +73,7 @@ public class TbelCfTsRollingArg implements TbelCfArg, Iterable<TbelCfTsDoubleVal
             throw new IllegalArgumentException("Rolling argument values are empty.");
         }
 
-        double max = Double.MIN_VALUE;
+        double max = -Double.MAX_VALUE;
         for (TbelCfTsDoubleVal value : values) {
             double val = value.getValue();
             if (!ignoreNaN && Double.isNaN(val)) {

common/script/script-api/src/test/java/org/thingsboard/script/api/tbel/TbelCfTsRollingArgTest.java

@@ -57,6 +57,19 @@ public class TbelCfTsRollingArgTest {
         assertThat(rollingArg.max(false)).isNaN();
     }
 
+    @Test
+    void testMaxOverAllNegativeValues() {
+        TbelCfTsRollingArg negativeArg = new TbelCfTsRollingArg(
+                new TbTimeWindow(ts - 30000, ts - 10),
+                List.of(
+                        new TbelCfTsDoubleVal(ts - 10, -50.0),
+                        new TbelCfTsDoubleVal(ts - 20, -100.0),
+                        new TbelCfTsDoubleVal(ts - 30, -75.0)
+                )
+        );
+        assertThat(negativeArg.max()).isEqualTo(-50.0);
+    }
+
     @Test
     void testMin() {
         assertThat(rollingArg.min()).isEqualTo(2.0);

dao/src/main/java/org/thingsboard/server/dao/sqlts/ts/TsKvRepository.java

@@ -61,8 +61,10 @@ public interface TsKvRepository extends JpaRepository<TsKvEntity, TsKvCompositeK
                              @Param("startTs") long startTs,
                              @Param("endTs") long endTs);
 
+    // -1.7976931348623157E308 = -Double.MAX_VALUE — the most negative finite double, used as a "less than any value" sentinel for MAX.
+    // Double.MIN_VALUE is +4.9E-324 (smallest positive), which would beat any negative real value and corrupt MAX.
     @Query("SELECT new TsKvEntity(MAX(COALESCE(tskv.longValue, -9223372036854775807)), " +
-            "MAX(COALESCE(tskv.doubleValue, java.lang.Double.MIN_VALUE)), " +
+            "MAX(COALESCE(tskv.doubleValue, -1.7976931348623157E308)), " +
             "SUM(CASE WHEN tskv.longValue IS NULL THEN 0 ELSE 1 END), " +
             "SUM(CASE WHEN tskv.doubleValue IS NULL THEN 0 ELSE 1 END), " +
             "'MAX', MAX(tskv.ts)) FROM TsKvEntity tskv " +

dao/src/main/java/org/thingsboard/server/dao/timeseries/AggregatePartitionsFunction.java

@@ -277,7 +277,7 @@ public class AggregatePartitionsFunction implements com.google.common.util.concu
     private Optional<TsKvEntry> processMinOrMaxResult(AggregationResult aggResult) {
         if (aggResult.dataType == DataType.DOUBLE || aggResult.dataType == DataType.LONG) {
             if (aggResult.hasDouble) {
-                double currentD = aggregation == Aggregation.MIN ? Optional.ofNullable(aggResult.dValue).orElse(Double.MAX_VALUE) : Optional.ofNullable(aggResult.dValue).orElse(Double.MIN_VALUE);
+                double currentD = aggregation == Aggregation.MIN ? Optional.ofNullable(aggResult.dValue).orElse(Double.MAX_VALUE) : Optional.ofNullable(aggResult.dValue).orElse(-Double.MAX_VALUE);
                 double currentL = aggregation == Aggregation.MIN ? Optional.ofNullable(aggResult.lValue).orElse(Long.MAX_VALUE) : Optional.ofNullable(aggResult.lValue).orElse(Long.MIN_VALUE);
                 return Optional.of(new BasicTsKvEntry(ts, new DoubleDataEntry(key, aggregation == Aggregation.MIN ? Math.min(currentD, currentL) : Math.max(currentD, currentL))));
             } else {

dao/src/test/java/org/thingsboard/server/dao/service/timeseries/BaseTimeseriesServiceTest.java

@@ -710,6 +710,18 @@ public abstract class BaseTimeseriesServiceTest extends AbstractServiceTest {
         assertEquals(java.util.Optional.of(2L), list.get(2).getLongValue());
     }
 
+    @Test
+    public void testFindDeviceMaxAggregationOverNegativeMixedLongAndDoubleTsData() throws Exception {
+        save(deviceId, 5000, -100L);
+        save(deviceId, 15000, -50.0);
+
+        List<TsKvEntry> list = tsService.findAll(tenantId, deviceId, Collections.singletonList(new BaseReadTsKvQuery(LONG_KEY, 0,
+                60000, 60000, 1, Aggregation.MAX))).get(MAX_TIMEOUT, TimeUnit.SECONDS);
+
+        assertEquals(1, list.size());
+        assertEquals(java.util.Optional.of(-50.0), list.get(0).getDoubleValue());
+    }
+
     @Test
     public void testSaveTs_RemoveTs_AndSaveTsAgain() throws Exception {
         save(deviceId, 2000000L, 95);