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java.lang.NullPointerException: 	at com.facebook.presto.mongodb.MongoSession.guessTableFields(MongoSession.java:508)	at com.facebook.presto.mongodb.MongoSession.getTableMetadata(MongoSession.java:403)	at com.facebook.presto.mongodb.MongoSession.loadTableSchema(MongoSession.java:189)	at com.facebook.presto.mongodb.MongoSession.access$000(MongoSession.java:78)	at com.facebook.presto.mongodb.MongoSession$1.load(MongoSession.java:137)	at com.facebook.presto.mongodb.MongoSession$1.load(MongoSession.java:132)	at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527)	at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319)	at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282)	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2197)	at com.google.common.cache.LocalCache.get(LocalCache.java:3937)	at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3941)	at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4824)	at com.facebook.presto.mongodb.MongoSession.getCacheValue(MongoSession.java:241)	at com.facebook.presto.mongodb.MongoSession.getTable(MongoSession.java:169)	at com.facebook.presto.mongodb.MongoMetadata.getTableHandle(MongoMetadata.java:83)	at com.facebook.presto.mongodb.MongoMetadata.getTableHandle(MongoMetadata.java:56)	at com.facebook.presto.transaction.LegacyConnectorMetadata.getTableHandle(LegacyConnectorMetadata.java:71)	at com.facebook.presto.metadata.MetadataManager.getTableHandle(MetadataManager.java:287)	at com.facebook.presto.sql.analyzer.StatementAnalyzer.visitTable(StatementAnalyzer.java:1053)	at com.facebook.presto.sql.analyzer.StatementAnalyzer.visitTable(StatementAnalyzer.java:232)	at com.facebook.presto.sql.tree.Table.accept(Table.java:50)	at com.facebook.presto.sql.tree.AstVisitor.process(AstVisitor.java:22)	at com.facebook.presto.sql.analyzer.StatementAnalyzer.analyzeFrom(StatementAnalyzer.java:1858)	at com.facebook.presto.sql.analyzer.StatementAnalyzer.visitQuerySpecification(StatementAnalyzer.java:1165)	at com.facebook.presto.sql.analyzer.StatementAnalyzer.visitQuerySpecification(StatementAnalyzer.java:232)	at com.facebook.presto.sql.tree.QuerySpecification.accept(QuerySpecification.java:125)	at com.facebook.presto.sql.tree.AstVisitor.process(AstVisitor.java:22)	at com.facebook.presto.sql.analyzer.StatementAnalyzer.visitQuery(StatementAnalyzer.java:931)	at com.facebook.presto.sql.analyzer.StatementAnalyzer.visitQuery(StatementAnalyzer.java:232)	at com.facebook.presto.sql.tree.Query.accept(Query.java:103)	at com.facebook.presto.sql.tree.AstVisitor.process(AstVisitor.java:22)	at com.facebook.presto.sql.analyzer.Analyzer.analyze(Analyzer.java:60)	at com.facebook.presto.execution.SqlQueryExecution.doAnalyzeQuery(SqlQueryExecution.java:277)	at com.facebook.presto.execution.SqlQueryExecution.analyzeQuery(SqlQueryExecution.java:263)	at com.facebook.presto.execution.SqlQueryExecution.start(SqlQueryExecution.java:227)	at com.facebook.presto.execution.QueuedExecution.lambda$start$1(QueuedExecution.java:68)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)