Load: Support "database" substitution for "database-name"

integration-test/src/test/java/org/apache/iotdb/db/it/IoTDBLoadTsFileIT.java

@@ -1054,7 +1054,9 @@ public void testLoadWithConvertOnTypeMismatchForTableModel() throws Exception {
       statement.execute(String.format("create database if not exists %s", SchemaConfig.DATABASE_0));
       statement.execute(String.format("use %s", SchemaConfig.DATABASE_0));
       statement.execute(convert2TableSQL(SchemaConfig.TABLE_0, schemaList1, columnCategories));
-      statement.execute(String.format("load '%s'", file.getAbsolutePath()));
+      statement.execute(
+          String.format(
+              "load '%s' with ('database'='%s')", file.getAbsolutePath(), SchemaConfig.DATABASE_0));
       try (final ResultSet resultSet =
           statement.executeQuery(String.format("select count(*) from %s", SchemaConfig.TABLE_0))) {
         if (resultSet.next()) {

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/parser/ASTVisitor.java

@@ -2121,6 +2121,7 @@ public Statement visitLoadFile(IoTDBSqlParser.LoadFileContext ctx) {
           LoadTsFileConfigurator.validateParameters(key, value);
           loadTsFileAttributes.put(key, value);
         }
+        LoadTsFileConfigurator.validateSynonymParameters(loadTsFileAttributes);
 
         loadTsFileStatement.setLoadAttributes(loadTsFileAttributes);
         return loadTsFileStatement;

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

@@ -996,6 +996,7 @@ public Node visitLoadTsFileStatement(RelationalSqlParser.LoadTsFileStatementCont
             : new HashMap<>();
 
     withAttributes.forEach(LoadTsFileConfigurator::validateParameters);
+    LoadTsFileConfigurator.validateSynonymParameters(withAttributes);
     return new LoadTsFile(
         getLocation(ctx), ((StringLiteral) visit(ctx.fileName)).getValue(), withAttributes);
   }

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/load/config/LoadTsFileConfigurator.java

@@ -45,6 +45,7 @@ public static void validateParameters(final String key, final String value) {
         validateOnSuccessParam(value);
         break;
       case DATABASE_NAME_KEY:
+      case DATABASE_KEY:
       case TABLET_CONVERSION_THRESHOLD_KEY:
         break;
       case CONVERT_ON_TYPE_MISMATCH_KEY:
@@ -61,6 +62,17 @@ public static void validateParameters(final String key, final String value) {
     }
   }
 
+  public static void validateSynonymParameters(final Map<String, String> parameters) {
+    if (parameters.containsKey(DATABASE_KEY) && parameters.containsKey(DATABASE_NAME_KEY)) {
+      throw new SemanticException(
+          "The parameter key '"
+              + DATABASE_KEY
+              + "' and '"
+              + DATABASE_NAME_KEY
+              + "' cannot co-exist.");
+    }
+  }
+
   public static final String DATABASE_LEVEL_KEY = "database-level";
   private static final int DATABASE_LEVEL_DEFAULT_VALUE =
       IoTDBDescriptor.getInstance().getConfig().getDefaultStorageGroupLevel();
@@ -90,9 +102,13 @@ public static int parseOrGetDefaultDatabaseLevel(final Map<String, String> loadA
   }
 
   public static final String DATABASE_NAME_KEY = "database-name";
+  public static final String DATABASE_KEY = "database";
 
   public static @Nullable String parseDatabaseName(final Map<String, String> loadAttributes) {
-    final String databaseName = loadAttributes.get(DATABASE_NAME_KEY);
+    String databaseName = loadAttributes.get(DATABASE_NAME_KEY);
+    if (Objects.isNull(databaseName)) {
+      databaseName = loadAttributes.get(DATABASE_KEY);
+    }
     return Objects.nonNull(databaseName) ? databaseName.toLowerCase(Locale.ENGLISH) : null;
   }