jiangML opened a new issue, #26659: URL: https://github.com/apache/shardingsphere/issues/26659
## Bug Report **For English only**, other languages will not accept. Before report a bug, make sure you have: - Searched open and closed [GitHub issues](https://github.com/apache/shardingsphere/issues). - Read documentation: [ShardingSphere Doc](https://shardingsphere.apache.org/document/current/en/overview). Please pay attention on issues you submitted, because we maybe need more details. If no response anymore and we cannot reproduce it on current information, we will **close it**. Please answer these questions before submitting your issue. Thanks! ### Which version of ShardingSphere did you use? master ### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy? proxy ### Expected behavior search successful ### Actual behavior fail ```shell mysql> select * from information_schema.PLUGINS; ERROR 30000 (HY000): Unknown exception: Cannot invoke "org.apache.shardingsphere.sqlfederation.executor.enumerable.EnumerablePushDownTableScanExecutor.execute(org.apache.shardingsphere.infra.metadata.database.schema.model.ShardingSphereTable, org.apache.shardingsphere.sqlfederation.executor.enumerable.EnumerablePushDownTableScanExecutorContext)" because "this.pushDownTableScanExecutor" is null ``` Proxy Error ```shell [ERROR] 2023-06-28 16:34:30.325 [ShardingSphere-Command-0] o.a.s.p.f.c.CommandExecutorTask - Exception occur: java.lang.NullPointerException: Cannot invoke "org.apache.shardingsphere.sqlfederation.executor.enumerable.EnumerablePushDownTableScanExecutor.execute(org.apache.shardingsphere.infra.metadata.database.schema.model.ShardingSphereTable, org.apache.shardingsphere.sqlfederation.executor.enumerable.EnumerablePushDownTableScanExecutorContext)" because "this.pushDownTableScanExecutor" is null at org.apache.shardingsphere.sqlfederation.compiler.metadata.schema.SQLFederationTable.project(SQLFederationTable.java:107) at Baz.bind(Unknown Source) at org.apache.shardingsphere.sqlfederation.engine.SQLFederationEngine.executeQuery(SQLFederationEngine.java:160) at org.apache.shardingsphere.proxy.backend.connector.DatabaseConnector.doExecuteFederation(DatabaseConnector.java:249) at org.apache.shardingsphere.proxy.backend.connector.DatabaseConnector.execute(DatabaseConnector.java:166) at org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.execute(MySQLComQueryPacketExecutor.java:99) at org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.doExecuteCommand(CommandExecutorTask.java:126) at org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:121) at org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:78) at com.alibaba.ttl.TtlRunnable.run(TtlRunnable.java:60) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:833) ``` ### Reason analyze (If you can) The name in ShardingSphereTable is capitalized SQLFederationSchema.class ```java private Map<String, Table> createTableMap(final ShardingSphereSchema schema, final DatabaseType protocolType, final JavaTypeFactory javaTypeFactory) { Map<String, Table> result = new LinkedHashMap<>(schema.getTables().size(), 1F); for (ShardingSphereTable each : schema.getTables().values()) { if (schema.containsView(each.getName())) { result.put(each.getName(), getViewTable(schema, each, protocolType, javaTypeFactory)); } else { // TODO implement table statistic logic after using custom operators result.put(each.getName(), new SQLFederationTable(each, new SQLFederationStatistic(), protocolType)); } } return result; } ``` SQLFederationEngine.class `metaData.getDatabase(databaseName).getSchema(schemaName).getAllTableNames()` gets lowercase table names ```java private void registerTableScanExecutor(final Schema sqlFederationSchema, final DriverExecutionPrepareEngine<JDBCExecutionUnit, Connection> prepareEngine, final JDBCExecutorCallback<? extends ExecuteResult> callback, final SQLFederationExecutorContext federationContext, final OptimizerContext optimizerContext) { if (null == sqlFederationSchema) { return; } TableScanExecutorContext executorContext = new TableScanExecutorContext(databaseName, schemaName, metaData.getProps(), federationContext); EnumerablePushDownTableScanExecutor pushDownTableScanExecutor = new EnumerablePushDownTableScanExecutor(prepareEngine, jdbcExecutor, callback, optimizerContext, metaData.getGlobalRuleMetaData(), executorContext, statistics); // TODO register only the required tables for (String each : metaData.getDatabase(databaseName).getSchema(schemaName).getAllTableNames()) { Table table = sqlFederationSchema.getTable(each); if (table instanceof SQLFederationTable) { ((SQLFederationTable) table).setPushDownTableScanExecutor(pushDownTableScanExecutor); } } } ``` ### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc. ### Example codes for reproduce this issue (such as a github link). -- This is an automated message from the Apache Git Service. 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