Fixed the NPE caused by concurrent "check for createTimeSeries" and deleteTimeSeries (apache#16742)

* befix

* shi

Author: Caideyipi

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/ISchemaRegion.java

@@ -146,7 +146,10 @@ void createTimeSeries(final ICreateTimeSeriesPlan plan, final long offset)
    * @param aliasList a list of alias that you want to check
    * @return returns a map contains index of the measurements or alias that threw the exception, and
    *     exception details. The exceptions describe whether the measurement or alias exists. For
-   *     example, a MeasurementAlreadyExistException means this measurement exists.
+   *     example, a MeasurementAlreadyExistException means this measurement exists. If there are
+   *     exceptions during check, this may return an empty map, then all the measurements will be
+   *     re-checked under consensus layer, which guarantees safety(Yet may cause unnecessary replay
+   *     of raft log)
    */
   Map<Integer, MetadataException> checkMeasurementExistence(
       final PartialPath devicePath,

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/impl/SchemaRegionMemoryImpl.java

@@ -874,7 +874,11 @@ public void createAlignedTimeSeries(final ICreateAlignedTimeSeriesPlan plan)
   @Override
   public Map<Integer, MetadataException> checkMeasurementExistence(
       PartialPath devicePath, List<String> measurementList, List<String> aliasList) {
-    return mTree.checkMeasurementExistence(devicePath, measurementList, aliasList);
+    try {
+      return mTree.checkMeasurementExistence(devicePath, measurementList, aliasList);
+    } catch (final Exception e) {
+      return Collections.emptyMap();
+    }
   }
 
   @Override

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/impl/SchemaRegionPBTreeImpl.java

@@ -855,7 +855,11 @@ public void createAlignedTimeSeries(final ICreateAlignedTimeSeriesPlan plan)
   @Override
   public Map<Integer, MetadataException> checkMeasurementExistence(
       PartialPath devicePath, List<String> measurementList, List<String> aliasList) {
-    return mtree.checkMeasurementExistence(devicePath, measurementList, aliasList);
+    try {
+      return mtree.checkMeasurementExistence(devicePath, measurementList, aliasList);
+    } catch (final Exception e) {
+      return Collections.emptyMap();
+    }
   }
 
   @Override