fix: validate internal tsfile paths for files only

iotdb-core/datanode/src/main/i18n/en/org/apache/iotdb/db/i18n/DataNodeQueryMessages.java

@@ -3677,6 +3677,8 @@ private DataNodeQueryMessages() {}
   public static final String EXCEPTION_UDFNAME_IS_NULL_83E9039B = "udfName is null";
   public static final String EXCEPTION_URISTRING_IS_NULL_E7458C6A = "uriString is null";
   public static final String EXCEPTION_FILEPATH_IS_NULL_84CE8A66 = "filePath is null";
+  public static final String EXCEPTION_LOAD_TSFILE_PATH_CANNOT_BE_EMPTY_2B106181 =
+      "The LOAD TSFILE path cannot be empty.";
   public static final String EXCEPTION_DETAILS_IS_NULL_8EDEEA03 = "details is null";
   public static final String EXCEPTION_COLUMNCATEGORY_IS_NULL_0075924B = "columnCategory is null";
   public static final String EXCEPTION_ARGUMENTNAME_IS_NULL_7F8F665F = "argumentName is null";

iotdb-core/datanode/src/main/i18n/zh/org/apache/iotdb/db/i18n/DataNodeQueryMessages.java

@@ -4420,6 +4420,8 @@ private DataNodeQueryMessages() {}
   public static final String EXCEPTION_UDFNAME_IS_NULL_83E9039B = "udfName 不能为空";
   public static final String EXCEPTION_URISTRING_IS_NULL_E7458C6A = "uriString 不能为空";
   public static final String EXCEPTION_FILEPATH_IS_NULL_84CE8A66 = "filePath 不能为空";
+  public static final String EXCEPTION_LOAD_TSFILE_PATH_CANNOT_BE_EMPTY_2B106181 =
+      "LOAD TSFILE 路径不能为空。";
   public static final String EXCEPTION_DETAILS_IS_NULL_8EDEEA03 = "details 不能为空";
   public static final String EXCEPTION_COLUMNCATEGORY_IS_NULL_0075924B = "columnCategory 不能为空";
   public static final String EXCEPTION_ARGUMENTNAME_IS_NULL_7F8F665F = "argumentName 不能为空";

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/sql/ast/LoadTsFile.java

@@ -111,6 +111,7 @@ private LoadTsFile(
     initAttributes();
 
     try {
+      LoadTsFileStatement.validateLoadTsFilePath(filePath);
       this.tsFiles =
           validateInternalDataDir
               ? LoadTsFileStatement.processTsFile(new File(filePath), validateSourcePath)

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/statement/crud/LoadTsFileStatement.java

@@ -94,6 +94,7 @@ public static LoadTsFileStatement createForPipe(String filePath) throws FileNotF
   private LoadTsFileStatement(
       String filePath, boolean validateSourcePath, boolean validateInternalDataDir)
       throws FileNotFoundException {
+    validateLoadTsFilePath(filePath);
     this.file = new File(filePath).getAbsoluteFile();
     this.databaseLevel = IoTDBDescriptor.getInstance().getConfig().getDefaultDatabaseLevel();
     this.verifySchema = true;
@@ -111,6 +112,13 @@ private LoadTsFileStatement(
     this.statementType = StatementType.MULTI_BATCH_INSERT;
   }
 
+  public static void validateLoadTsFilePath(final String filePath) throws FileNotFoundException {
+    if (filePath == null || filePath.isEmpty()) {
+      throw new FileNotFoundException(
+          DataNodeQueryMessages.EXCEPTION_LOAD_TSFILE_PATH_CANNOT_BE_EMPTY_2B106181);
+    }
+  }
+
   public static List<File> processTsFile(final File file) throws FileNotFoundException {
     return processTsFile(file, true, true);
   }

iotdb-core/datanode/src/test/java/org/apache/iotdb/db/queryengine/plan/analyze/load/LoadTsFileAnalyzerTest.java

@@ -120,6 +120,16 @@ public void testAnalyzeSingleTableFileShouldNotCountTimestampInPointCount() thro
     Assert.assertEquals(2, schemaCache.getVerifiedDeviceCount());
   }
 
+  @Test
+  public void testTableLoadEmptyPathIsRejected() {
+    try {
+      new LoadTsFile(null, "", Collections.emptyMap());
+      Assert.fail("Expected empty LOAD TSFILE path to be rejected.");
+    } catch (final RuntimeException e) {
+      Assert.assertTrue(e.getMessage().contains("The LOAD TSFILE path cannot be empty."));
+    }
+  }
+
   @Test
   public void testTableSchemaCacheShouldThrowMismatchWhenVerifyingDataType() throws Exception {
     final LoadTsFileTableSchemaCache schemaCache = createTableSchemaCache(true);

iotdb-core/datanode/src/test/java/org/apache/iotdb/db/queryengine/plan/statement/crud/LoadTsFileStatementTest.java

@@ -21,6 +21,7 @@
 
 import org.apache.iotdb.db.conf.IoTDBConfig;
 import org.apache.iotdb.db.conf.IoTDBDescriptor;
+import org.apache.iotdb.db.queryengine.plan.parser.StatementGenerator;
 
 import org.junit.Assert;
 import org.junit.Test;
@@ -29,6 +30,7 @@
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.time.ZoneId;
 import java.util.Comparator;
 import java.util.List;
 import java.util.stream.Stream;
@@ -144,6 +146,16 @@ public void testLoadInternalTsFileIsRejectedWithoutLeakingPath() throws Exceptio
     }
   }
 
+  @Test
+  public void testTreeLoadEmptyPathIsRejected() {
+    try {
+      StatementGenerator.createStatement("LOAD TSFILE ''", ZoneId.systemDefault());
+      Assert.fail("Expected empty LOAD TSFILE path to be rejected.");
+    } catch (final RuntimeException e) {
+      Assert.assertTrue(e.getMessage().contains("The LOAD TSFILE path cannot be empty."));
+    }
+  }
+
   @Test
   public void testLoadPipeReceiverTsFileOutsideDataDirIsAllowed() throws Exception {
     final IoTDBConfig config = IoTDBDescriptor.getInstance().getConfig();