Fix #7342

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-merge/src/main/java/org/apache/shardingsphere/sharding/merge/dal/show/LogicTablesMergedResult.java

@@ -53,7 +53,7 @@ protected final List<MemoryQueryResultRow> init(final ShardingRule shardingRule,
                 String actualTableName = memoryResultSetRow.getCell(1).toString();
                 Optional<TableRule> tableRule = shardingRule.findTableRuleByActualTable(actualTableName);
                 if (!tableRule.isPresent()) {
-                    if (shardingRule.getTableRules().isEmpty() || schemaMetaData.containsTable(actualTableName) && tableNames.add(actualTableName)) {
+                    if (shardingRule.getTableRules().isEmpty() || tableNames.add(actualTableName)) {
                         result.add(memoryResultSetRow);
                     }
                 } else if (tableNames.add(tableRule.get().getLogicTable())) {

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-merge/src/test/java/org/apache/shardingsphere/sharding/merge/dal/show/ShowTablesMergedResultTest.java

@@ -82,10 +82,4 @@ public void assertNextForActualTableNameInTableRule() throws SQLException {
         LogicTablesMergedResult actual = new LogicTablesMergedResult(shardingRule, mock(SQLStatementContext.class), schemaMetaData, Collections.singletonList(createQueryResult("table_0")));
         assertTrue(actual.next());
     }
-
-    @Test
-    public void assertNextForActualTableNameNotInTableRule() throws SQLException {
-        LogicTablesMergedResult actual = new LogicTablesMergedResult(shardingRule, mock(SQLStatementContext.class), schemaMetaData, Collections.singletonList(createQueryResult("table_3")));
-        assertFalse(actual.next());
-    }
 }

shardingsphere-infra/shardingsphere-infra-route/src/main/java/org/apache/shardingsphere/infra/route/DataNodeRouter.java

@@ -17,19 +17,20 @@
 
 package org.apache.shardingsphere.infra.route;
 
-import org.apache.shardingsphere.infra.spi.ShardingSphereServiceLoader;
-import org.apache.shardingsphere.infra.spi.order.OrderedSPIRegistry;
-import org.apache.shardingsphere.sql.parser.binder.SQLStatementContextFactory;
-import org.apache.shardingsphere.sql.parser.binder.statement.CommonSQLStatementContext;
-import org.apache.shardingsphere.sql.parser.binder.statement.SQLStatementContext;
-import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
 import org.apache.shardingsphere.infra.config.properties.ConfigurationProperties;
 import org.apache.shardingsphere.infra.metadata.ShardingSphereMetaData;
-import org.apache.shardingsphere.infra.rule.ShardingSphereRule;
 import org.apache.shardingsphere.infra.route.context.RouteContext;
 import org.apache.shardingsphere.infra.route.context.RouteResult;
 import org.apache.shardingsphere.infra.route.decorator.RouteDecorator;
+import org.apache.shardingsphere.infra.route.decorator.UnconfiguredSchemaRouteDecorator;
 import org.apache.shardingsphere.infra.route.hook.SPIRoutingHook;
+import org.apache.shardingsphere.infra.rule.ShardingSphereRule;
+import org.apache.shardingsphere.infra.spi.ShardingSphereServiceLoader;
+import org.apache.shardingsphere.infra.spi.order.OrderedSPIRegistry;
+import org.apache.shardingsphere.sql.parser.binder.SQLStatementContextFactory;
+import org.apache.shardingsphere.sql.parser.binder.statement.CommonSQLStatementContext;
+import org.apache.shardingsphere.sql.parser.binder.statement.SQLStatementContext;
+import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
 
 import java.util.Collection;
 import java.util.List;
@@ -89,7 +90,7 @@ private RouteContext executeRoute(final SQLStatement sqlStatement, final List<Ob
         for (Entry<ShardingSphereRule, RouteDecorator> entry : decorators.entrySet()) {
             result = entry.getValue().decorate(result, metaData, entry.getKey(), props);
         }
-        return result;
+        return new UnconfiguredSchemaRouteDecorator().decorate(result, metaData);
     }
 
     private RouteContext createRouteContext(final SQLStatement sqlStatement, final List<Object> parameters) {

shardingsphere-infra/shardingsphere-infra-route/src/main/java/org/apache/shardingsphere/infra/route/decorator/UnconfiguredSchemaRouteDecorator.java

@@ -0,0 +1,54 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shardingsphere.infra.route.decorator;
+
+import org.apache.shardingsphere.infra.metadata.ShardingSphereMetaData;
+import org.apache.shardingsphere.infra.route.context.RouteContext;
+import org.apache.shardingsphere.infra.route.context.RouteMapper;
+import org.apache.shardingsphere.infra.route.context.RouteUnit;
+import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.statement.mysql.dal.MySQLShowTablesStatement;
+
+import java.util.Collections;
+
+/**
+ * Unconfigured schema route decorator.
+ */
+public final class UnconfiguredSchemaRouteDecorator {
+
+    /**
+     * Decorate route context.
+     *
+     * @param routeContext route context
+     * @param metaData meta data of ShardingSphere
+     * @return decorated route context
+     */
+    public RouteContext decorate(final RouteContext routeContext, final ShardingSphereMetaData metaData) {
+        if (isNeedUnconfiguredSchema(routeContext.getSqlStatementContext().getSqlStatement())) {
+            for (String each : metaData.getRuleSchemaMetaData().getUnconfiguredSchemaMetaDataMap().keySet()) {
+                routeContext.getRouteResult().getRouteUnits().add(new RouteUnit(new RouteMapper(each, each), Collections.emptyList()));
+            }
+        }
+        return routeContext;
+    }
+
+    // TODO use dynamic config to judge UnconfiguredSchema
+    private boolean isNeedUnconfiguredSchema(final SQLStatement sqlStatement) {
+        return sqlStatement instanceof MySQLShowTablesStatement;
+    }
+}