support information_schema.PARAMETERS query in cluster mod

infra/common/src/main/java/org/apache/shardingsphere/infra/metadata/statistics/builder/dialect/MySQLShardingSphereStatisticsBuilder.java

@@ -28,38 +28,60 @@
 import org.apache.shardingsphere.infra.metadata.database.schema.model.ShardingSphereSchema;
 import org.apache.shardingsphere.infra.metadata.database.schema.model.ShardingSphereTable;
 
-import java.util.Optional;
+import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.Map.Entry;
+import java.util.Optional;
+import java.util.Set;
 
 /**
  * ShardingSphere statistics builder for MySQL.
  */
 
 public final class MySQLShardingSphereStatisticsBuilder implements ShardingSphereStatisticsBuilder {
 
+    private static final Set<String> CURRENT_SUPPORT = new HashSet<>(Arrays.asList("PARAMETERS"));
+
     private static final String SHARDING_SPHERE = "shardingsphere";
 
+    private static final String INFORMATION_SCHEMA = "information_schema";
+
     private static final String CLUSTER_INFORMATION = "cluster_information";
 
     @Override
     public ShardingSphereStatistics build(final ShardingSphereMetaData metaData) {
         ShardingSphereStatistics result = new ShardingSphereStatistics();
         Optional<ShardingSphereSchema> shardingSphereSchema = Optional.ofNullable(metaData.getDatabase(SHARDING_SPHERE)).map(database -> database.getSchema(SHARDING_SPHERE));
-        if (!shardingSphereSchema.isPresent()) {
-            return result;
+        if (shardingSphereSchema.isPresent()) {
+            ShardingSphereSchemaData schemaData = new ShardingSphereSchemaData();
+            for (Entry<String, ShardingSphereTable> entry : shardingSphereSchema.get().getTables().entrySet()) {
+                ShardingSphereTableData tableData = new ShardingSphereTableData(entry.getValue().getName());
+                if (CLUSTER_INFORMATION.equals(entry.getKey())) {
+                    tableData.getRows().add(new ShardingSphereRowData(Collections.singletonList(ShardingSphereVersion.VERSION)));
+                }
+                schemaData.getTableData().put(entry.getKey(), tableData);
+            }
+            ShardingSphereDatabaseData databaseData = new ShardingSphereDatabaseData();
+            databaseData.getSchemaData().put(SHARDING_SPHERE, schemaData);
+            result.getDatabaseData().put(SHARDING_SPHERE, databaseData);
         }
-        ShardingSphereSchemaData schemaData = new ShardingSphereSchemaData();
-        for (Entry<String, ShardingSphereTable> entry : shardingSphereSchema.get().getTables().entrySet()) {
-            ShardingSphereTableData tableData = new ShardingSphereTableData(entry.getValue().getName());
-            if (CLUSTER_INFORMATION.equals(entry.getKey())) {
-                tableData.getRows().add(new ShardingSphereRowData(Collections.singletonList(ShardingSphereVersion.VERSION)));
+
+        Optional<ShardingSphereSchema> informationSchemaSchema = Optional.ofNullable(metaData.getDatabase("information_schema")).map(database -> database.getSchema("information_schema"));
+        if (informationSchemaSchema.isPresent()) {
+            ShardingSphereSchemaData schemaData = new ShardingSphereSchemaData();
+            for (Entry<String, ShardingSphereTable> entry : informationSchemaSchema.get().getTables().entrySet()) {
+                if (!CURRENT_SUPPORT.contains(entry.getValue().getName())) {
+                    continue;
+                }
+                ShardingSphereTableData tableData = new ShardingSphereTableData(entry.getValue().getName());
+                schemaData.getTableData().put(entry.getValue().getName(), tableData);
             }
-            schemaData.getTableData().put(entry.getKey(), tableData);
+            ShardingSphereDatabaseData informationSchemaResult = new ShardingSphereDatabaseData();
+            informationSchemaResult.getSchemaData().put(INFORMATION_SCHEMA, schemaData);
+            result.getDatabaseData().put(INFORMATION_SCHEMA, informationSchemaResult);
         }
-        ShardingSphereDatabaseData databaseData = new ShardingSphereDatabaseData();
-        databaseData.getSchemaData().put(SHARDING_SPHERE, schemaData);
-        result.getDatabaseData().put(SHARDING_SPHERE, databaseData);
+
         return result;
     }
 

kernel/data-pipeline/core/src/main/java/org/apache/shardingsphere/data/pipeline/core/listener/ShardingSphereStatisticsScheduleCollector.java

@@ -113,7 +113,7 @@ private void collectForTable(final String databaseName, final String schemaName,
                 log.error("Collect data failed!", ex);
             }
             tableData.ifPresent(optional -> statistics.getDatabaseData().computeIfAbsent(databaseName.toLowerCase(), key -> new ShardingSphereDatabaseData())
-                    .getSchemaData().computeIfAbsent(schemaName, key -> new ShardingSphereSchemaData()).getTableData().put(table.getName().toLowerCase(), optional));
+                    .getSchemaData().computeIfAbsent(schemaName, key -> new ShardingSphereSchemaData()).getTableData().put(table.getName(), optional));
         }
 
         private void compareUpdateAndSendEvent(final ShardingSphereStatistics statistics, final ShardingSphereStatistics changedStatistics,
@@ -139,7 +139,7 @@ private void compareUpdateAndSendEventForTable(final String databaseName, final
             if (tableData.equals(changedTableData)) {
                 return;
             }
-            statistics.getDatabaseData().get(databaseName).getSchemaData().get(schemaName).getTableData().put(changedTableData.getName().toLowerCase(), changedTableData);
+            statistics.getDatabaseData().get(databaseName).getSchemaData().get(schemaName).getTableData().put(changedTableData.getName(), changedTableData);
             ShardingSphereSchemaDataAlteredEvent event = getShardingSphereSchemaDataAlteredEvent(databaseName, schemaName, tableData, changedTableData, table);
             contextManager.getInstanceContext().getEventBusContext().post(event);
         }

proxy/backend/core/src/main/java/org/apache/shardingsphere/proxy/backend/collector/MySQLInformationSchemaParameterTableCollector.java

@@ -0,0 +1,65 @@
+/*
+ * 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.proxy.backend.collector;
+
+import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
+import org.apache.shardingsphere.infra.metadata.database.schema.model.ShardingSphereTable;
+import org.apache.shardingsphere.infra.metadata.statistics.ShardingSphereRowData;
+import org.apache.shardingsphere.infra.metadata.statistics.ShardingSphereTableData;
+import org.apache.shardingsphere.infra.metadata.statistics.collector.ShardingSphereStatisticsCollector;
+import org.apache.shardingsphere.infra.metadata.statistics.collector.ShardingSphereTableDataCollectorUtils;
+import org.apache.shardingsphere.proxy.backend.context.ProxyContext;
+
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Optional;
+
+/**
+ * MySQLInformationSchemaParameterTableCollector.
+ */
+public final class MySQLInformationSchemaParameterTableCollector implements ShardingSphereStatisticsCollector {
+
+    private static final String PARAMETER_TABLE_NAME = "PARAMETERS";
+
+    private static final String COLLECT_SQL = "select * from information_schema.PARAMETERS";
+
+    @Override
+    public Optional<ShardingSphereTableData> collect(final String databaseName, final ShardingSphereTable table,
+                                                     final Map<String, ShardingSphereDatabase> shardingSphereDatabases) throws SQLException {
+        Optional<String> databaseWithDatasource = ProxyContext.getInstance().getAllDatabaseNames().stream().filter(MySQLInformationSchemaParameterTableCollector::hasDataSource).findFirst();
+        if (databaseWithDatasource.isPresent()) {
+            Collection<ShardingSphereRowData> rows = ShardingSphereTableDataCollectorUtils.collectRowData(shardingSphereDatabases.get(databaseWithDatasource.get()),
+                    table, table.getColumnNames(), COLLECT_SQL);
+            ShardingSphereTableData result = new ShardingSphereTableData(PARAMETER_TABLE_NAME);
+            result.getRows().addAll(rows);
+            return Optional.of(result);
+        }
+        return Optional.empty();
+    }
+
+    private static Boolean hasDataSource(final String databaseName) {
+        return ProxyContext.getInstance().getDatabase(databaseName).containsDataSource();
+    }
+
+    @Override
+    public Object getType() {
+        return PARAMETER_TABLE_NAME;
+    }
+
+}

proxy/backend/core/src/main/resources/META-INF/services/org.apache.shardingsphere.infra.metadata.statistics.collector.ShardingSphereStatisticsCollector

@@ -0,0 +1,18 @@
+#
+# 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.
+#
+
+org.apache.shardingsphere.proxy.backend.collector.MySQLInformationSchemaParameterTableCollector