haj8888888 opened a new issue #2396: Execute the query statement，sharding-proxy An exception occurred in the background ,java.lang.NullPointerException: null URL: https://github.com/apache/incubator-shardingsphere/issues/2396 Which version of ShardingSphere did you use? sharding-proxy-4.0.0-RC1 Which project did you use? Sharding-JDBC or Sharding-Proxy? sharding-proxy-4.0.0-RC1 Exception description：`java.lang.NullPointerException: null at org.apache.shardingsphere.core.parse.antlr.extractor.impl.dml.select.item.FunctionSelectItemSegmentExtractor.extractFunctionSelectItemSegment(FunctionSelectItemSegmentExtractor.java:50) at org.apache.shardingsphere.core.parse.antlr.extractor.impl.dml.select.item.FunctionSelectItemSegmentExtractor.extract(FunctionSelectItemSegmentExtractor.java:46) at org.apache.shardingsphere.core.parse.antlr.extractor.impl.dml.select.item.SelectItemExtractor.extract(SelectItemExtractor.java:54) at org.apache.shardingsphere.core.parse.antlr.extractor.impl.dml.select.SelectClauseExtractor.setSelectItemSegment(SelectClauseExtractor.java:61) at org.apache.shardingsphere.core.parse.antlr.extractor.impl.dml.select.SelectClauseExtractor.extract(SelectClauseExtractor.java:48) at org.apache.shardingsphere.core.parse.antlr.extractor.SQLSegmentsExtractorEngine.extract(SQLSegmentsExtractorEngine.java:47) at org.apache.shardingsphere.core.parse.antlr.AntlrParsingEngine.parse(AntlrParsingEngine.java:71) at org.apache.shardingsphere.core.parse.SQLParsingEngine.parse(SQLParsingEngine.java:61) at org.apache.shardingsphere.core.route.router.sharding.ParsingSQLRouter.parse(ParsingSQLRouter.java:78) at org.apache.shardingsphere.core.route.StatementRoutingEngine.route(StatementRoutingEngine.java:56) at org.apache.shardingsphere.core.SimpleQueryShardingEngine.route(SimpleQueryShardingEngine.java:60) at org.apache.shardingsphere.core.BaseShardingEngine.shard(BaseShardingEngine.java:64) at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.wrapper.StatementExecutorWrapper.doShardingRoute(StatementExecutorWrapper.java:86) at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.wrapper.StatementExecutorWrapper.route(StatementExecutorWrapper.java:57) at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:79) at org.apache.shardingsphere.shardingproxy.backend.text.query.QueryBackendHandler.execute(QueryBackendHandler.java:54) at org.apache.shardingsphere.shardingproxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.execute(MySQLComQueryPacketExecutor.java:71) at org.apache.shardingsphere.shardingproxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:86) at org.apache.shardingsphere.shardingproxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:66) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) ` Execute SQL： `select * from t_order t join t_order_item ti on t.order_id = ti.order_id;`
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