[GitHub] [shardingsphere] Simbafa commented on issue #6314: mysql "select * from events" cause null pointer exception

[GitBox <gi...@apache.org>]

Simbafa commented on issue #6314:
URL: https://github.com/apache/shardingsphere/issues/6314#issuecomment-656100755


   The stack trace:
   ```
   [INFO ] 19:59:25.221 [ShardingSphere-Command-0] o.a.s.s.f.m.c.MySQLCommandExecutorFactory - Execute packet type: COM_QUERY, value: MySQLComQueryPacket(sql=select * from events)
   line 1:14 no viable alternative at input 'events'
   line 1:14 mismatched input 'events' expecting {'(', '{', TRUNCATE, POSITION, VIEW, ANY, OFFSET, BEGIN, COMMIT, ROLLBACK, SAVEPOINT, BOOLEAN, DATE, TIME, TIMESTAMP, YEAR, QUARTER, MONTH, WEEK, DAY, HOUR, MINUTE, SECOND, MICROSECOND, MAX, MIN, SUM, COUNT, AVG, CURRENT, ENABLE, DISABLE, INSTANCE, DO, DEFINER, CASCADED, LOCAL, CLOSE, OPEN, NEXT, NAME, TYPE, TABLES, TABLESPACE, COLUMNS, FIELDS, INDEXES, STATUS, MODIFY, VALUE, DUPLICATE, FIRST, LAST, AFTER, OJ, ACCOUNT, USER, ROLE, START, TRANSACTION, WITHOUT, ESCAPE, SUBPARTITION, STORAGE, SUPER, TEMPORARY, THAN, UNBOUNDED, SIGNED, UPGRADE, VALIDATION, ROLLUP, SOUNDS, UNKNOWN, OFF, ALWAYS, COMMITTED, LEVEL, NO, PASSWORD, PRIVILEGES, ACTION, ALGORITHM, AUTOCOMMIT, BTREE, CHAIN, CHARSET, CHECKSUM, CIPHER, CLIENT, COALESCE, COMMENT, COMPACT, COMPRESSED, COMPRESSION, CONNECTION, CONSISTENT, DATA, DISCARD, DISK, ENCRYPTION, END, ENGINE, EVENT, EXCHANGE, EXECUTE, FILE, FIXED, FOLLOWING, GLOBAL, HASH, IMPORT_, LESS, MEMORY, NONE, PARSER, PARTIAL, PARTITIONING, PERSIST, PRECEDING, PROCESS, PROXY, QUICK, REBUILD, REDUNDANT, RELOAD, REMOVE, REORGANIZE, REPAIR, REVERSE, SESSION, SHUTDOWN, SIMPLE, SLAVE, VISIBLE, INVISIBLE, ENFORCED, AGAINST, LANGUAGE, MODE, QUERY, EXTENDED, EXPANSION, VARIANCE, MAX_ROWS, MIN_ROWS, SQL_BIG_RESULT, SQL_BUFFER_RESULT, SQL_CACHE, SQL_NO_CACHE, STATS_AUTO_RECALC, STATS_PERSISTENT, STATS_SAMPLE_PAGES, ROW_FORMAT, WEIGHT_STRING, COLUMN_FORMAT, INSERT_METHOD, KEY_BLOCK_SIZE, PACK_KEYS, PERSIST_ONLY, BIT_AND, BIT_OR, BIT_XOR, GROUP_CONCAT, JSON_ARRAYAGG, JSON_OBJECTAGG, STD, STDDEV, STDDEV_POP, STDDEV_SAMP, VAR_POP, VAR_SAMP, AUTO_INCREMENT, AVG_ROW_LENGTH, DELAY_KEY_WRITE, ROTATE, MASTER, BINLOG, ERROR, SCHEDULE, COMPLETION, EVERY, HOST, SOCKET, PORT, SERVER, WRAPPER, OPTIONS, OWNER, RETURNS, CONTAINS, SECURITY, INVOKER, TEMPTABLE, MERGE, UNDEFINED, DATAFILE, FILE_BLOCK_SIZE, EXTENT_SIZE, INITIAL_SIZE, AUTOEXTEND_SIZE, MAX_SIZE, NODEGROUP, WAIT, LOGFILE, UNDOFILE, UNDO_BUFFER_SIZE, REDO_BUFFER_SIZE, HANDLER, PREV, ORGANIZATION, DEFINITION, DESCRIPTION, REFERENCE, FOLLOWS, PRECEDES, IMPORT, CONCURRENT, XML, DUMPFILE, SHARE, CODE, CONTEXT, SOURCE, CHANNEL, CLONE, AGGREGATE, INSTALL, COMPONENT, UNINSTALL, RESOURCE, EXPIRE, NEVER, HISTORY, OPTIONAL, REUSE, MAX_QUERIES_PER_HOUR, MAX_UPDATES_PER_HOUR, MAX_CONNECTIONS_PER_HOUR, MAX_USER_CONNECTIONS, RETAIN, RANDOM, OLD, ISSUER, SUBJECT, CACHE, GENERAL, SLOW, USER_RESOURCES, EXPORT, RELAY, HOSTS, FLUSH, RESET, RESTART, IO_THREAD, SQL_THREAD, SQL_BEFORE_GTIDS, SQL_AFTER_GTIDS, MASTER_LOG_FILE, MASTER_LOG_POS, RELAY_LOG_FILE, RELAY_LOG_POS, SQL_AFTER_MTS_GAPS, UNTIL, DEFAULT_AUTH, PLUGIN_DIR, STOP, IDENTIFIER_}
   java.lang.NullPointerException
   	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitEscapedTableReference(MySQLDMLVisitor.java:496)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitEscapedTableReference(MySQLDMLVisitor.java:127)
   	at org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser$EscapedTableReferenceContext.accept(MySQLStatementParser.java:5947)
   	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitTableReferences(MySQLDMLVisitor.java:489)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitTableReferences(MySQLDMLVisitor.java:127)
   	at org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser$TableReferencesContext.accept(MySQLStatementParser.java:5891)
   	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitFromClause(MySQLDMLVisitor.java:481)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitFromClause(MySQLDMLVisitor.java:127)
   	at org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser$FromClauseContext.accept(MySQLStatementParser.java:5846)
   	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitSelectClause(MySQLDMLVisitor.java:334)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitSelectClause(MySQLDMLVisitor.java:127)
   	at org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser$SelectClauseContext.accept(MySQLStatementParser.java:4551)
   	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitUnionClause(MySQLDMLVisitor.java:322)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitUnionClause(MySQLDMLVisitor.java:127)
   	at org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser$UnionClauseContext.accept(MySQLStatementParser.java:4446)
   	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitSelect(MySQLDMLVisitor.java:314)
   	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitSelect(MySQLDMLVisitor.java:127)
   	at org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser$SelectContext.accept(MySQLStatementParser.java:3098)
   	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
   	at org.apache.shardingsphere.sql.parser.SQLParserEngine.parse0(SQLParserEngine.java:80)
   	at org.apache.shardingsphere.sql.parser.SQLParserEngine.parse(SQLParserEngine.java:61)
   	at org.apache.shardingsphere.shardingproxy.backend.text.TextProtocolBackendHandlerFactory.newInstance(TextProtocolBackendHandlerFactory.java:75)
   	at org.apache.shardingsphere.shardingproxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.<init>(MySQLComQueryPacketExecutor.java:71)
   	at org.apache.shardingsphere.shardingproxy.frontend.mysql.command.MySQLCommandExecutorFactory.newInstance(MySQLCommandExecutorFactory.java:71)
   	at org.apache.shardingsphere.shardingproxy.frontend.mysql.command.MySQLCommandExecuteEngine.getCommandExecutor(MySQLCommandExecuteEngine.java:59)
   	at org.apache.shardingsphere.shardingproxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:92)
   	at org.apache.shardingsphere.shardingproxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:71)
   	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
   	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
   	at java.lang.Thread.run(Thread.java:748)
   ```


----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org