Fixed the calculation error of schema cache (#16818)

* ff

* back-roll

Author: Caideyipi

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/metadata/fetcher/cache/TableDeviceLastCache.java

@@ -120,14 +120,14 @@ int initOrInvalidate(
           (measurementKey, tvPair) -> {
             if (Objects.isNull(newPair)) {
               diff.addAndGet(
-                  -((isTableModel ? 0 : (int) RamUsageEstimator.sizeOf(finalMeasurement))
-                      + getTVPairEntrySize(tvPair)));
+                  -(isTableModel ? 0 : (int) RamUsageEstimator.sizeOf(finalMeasurement))
+                      + getTVPairEntrySize(tvPair));
               return null;
             }
             if (Objects.isNull(tvPair)) {
               diff.addAndGet(
                   (isTableModel ? 0 : (int) RamUsageEstimator.sizeOf(finalMeasurement))
-                      + (int) RamUsageEstimator.HASHTABLE_RAM_BYTES_PER_ENTRY);
+                      + getTVPairEntrySize(newPair));
               return newPair;
             }
             return tvPair;

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/metadata/fetcher/cache/TreeDeviceNormalSchema.java

@@ -88,7 +88,10 @@ private int putEntry(
     final SchemaCacheEntry putEntry = new SchemaCacheEntry(schema, tagMap);
     final SchemaCacheEntry cachedEntry = measurementMap.put(measurement, putEntry);
     return Objects.isNull(cachedEntry)
-        ? (int) (RamUsageEstimator.sizeOf(measurement) + SchemaCacheEntry.estimateSize(putEntry))
+        ? (int)
+            (RamUsageEstimator.sizeOf(measurement)
+                + SchemaCacheEntry.estimateSize(putEntry)
+                + RamUsageEstimator.HASHTABLE_RAM_BYTES_PER_ENTRY)
         : SchemaCacheEntry.estimateSize(putEntry) - SchemaCacheEntry.estimateSize(cachedEntry);
   }
 
@@ -101,7 +104,8 @@ public int estimateSize() {
                 entry ->
                     Math.toIntExact(
                         RamUsageEstimator.sizeOf(entry.getKey())
-                            + SchemaCacheEntry.estimateSize(entry.getValue())))
+                            + SchemaCacheEntry.estimateSize(entry.getValue())
+                            + RamUsageEstimator.HASHTABLE_RAM_BYTES_PER_ENTRY))
             .reduce(0, Integer::sum);
   }
 }