Flaky test TestCachingJdbcClient.testConcurrentSchemaCreateAndDrop

[hashhar]

io.trino.plugin.jdbc.TestCachingJdbcClient.testConcurrentSchemaCreateAndDrop  Time elapsed: 0.087 s  <<< FAILURE!
com.google.common.util.concurrent.UncheckedExecutionException: 
io.trino.spi.TrinoException: General error: "java.lang.NullPointerException"; SQL statement:
SELECT SCHEMA_NAME TABLE_SCHEM, CATALOG_NAME TABLE_CATALOG,  IS_DEFAULT FROM INFORMATION_SCHEMA.SCHEMATA WHERE CATALOG_NAME LIKE ? ESCAPE ? AND SCHEMA_NAME LIKE ? ESCAPE ? ORDER BY SCHEMA_NAME [50000-200]
	at com.google.common.util.concurrent.Futures.wrapAndThrowUnchecked(Futures.java:1396)
	at com.google.common.util.concurrent.Futures.getUnchecked(Futures.java:1382)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
	at io.trino.plugin.jdbc.TestCachingJdbcClient.testConcurrentSchemaCreateAndDrop(TestCachingJdbcClient.java:621)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:104)
	at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:54)
	at org.testng.internal.InvokeMethodRunnable.run(InvokeMethodRunnable.java:44)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: io.trino.spi.TrinoException: General error: "java.lang.NullPointerException"; SQL statement:
SELECT SCHEMA_NAME TABLE_SCHEM, CATALOG_NAME TABLE_CATALOG,  IS_DEFAULT FROM INFORMATION_SCHEMA.SCHEMATA WHERE CATALOG_NAME LIKE ? ESCAPE ? AND SCHEMA_NAME LIKE ? ESCAPE ? ORDER BY SCHEMA_NAME [50000-200]
	at io.trino.plugin.jdbc.BaseJdbcClient.listSchemas(BaseJdbcClient.java:155)
	at io.trino.plugin.jdbc.BaseJdbcClient.getSchemaNames(BaseJdbcClient.java:132)
	at io.trino.plugin.jdbc.ForwardingJdbcClient.getSchemaNames(ForwardingJdbcClient.java:71)
	at io.trino.plugin.jdbc.CachingJdbcClient.lambda$getSchemaNames$1(CachingJdbcClient.java:143)
	at io.trino.plugin.base.cache.EvictableCache.get(EvictableCache.java:109)
	at io.trino.plugin.jdbc.CachingJdbcClient.get(CachingJdbcClient.java:679)
	at io.trino.plugin.jdbc.CachingJdbcClient.getSchemaNames(CachingJdbcClient.java:143)
	at io.trino.plugin.jdbc.TestCachingJdbcClient.lambda$testConcurrentSchemaCreateAndDrop$44(TestCachingJdbcClient.java:614)
	... 4 more
Caused by: org.h2.jdbc.JdbcSQLNonTransientException: General error: "java.lang.NullPointerException"; SQL statement:
SELECT SCHEMA_NAME TABLE_SCHEM, CATALOG_NAME TABLE_CATALOG,  IS_DEFAULT FROM INFORMATION_SCHEMA.SCHEMATA WHERE CATALOG_NAME LIKE ? ESCAPE ? AND SCHEMA_NAME LIKE ? ESCAPE ? ORDER BY SCHEMA_NAME [50000-200]
	at org.h2.message.DbException.getJdbcSQLException(DbException.java:505)
	at org.h2.message.DbException.getJdbcSQLException(DbException.java:429)
	at org.h2.message.DbException.get(DbException.java:194)
	at org.h2.message.DbException.convert(DbException.java:347)
	at org.h2.command.Command.executeQuery(Command.java:212)
	at org.h2.jdbc.JdbcPreparedStatement.executeQuery(JdbcPreparedStatement.java:114)
	at org.h2.jdbc.JdbcDatabaseMetaData.getSchemas(JdbcDatabaseMetaData.java:3176)
	at io.trino.plugin.jdbc.BaseJdbcClient.listSchemas(BaseJdbcClient.java:143)
	... 11 more
Caused by: java.lang.NullPointerException
	at org.h2.table.MetaTable.generateRows(MetaTable.java:1515)
	at org.h2.index.MetaIndex.find(MetaIndex.java:51)
	at org.h2.index.BaseIndex.find(BaseIndex.java:148)
	at org.h2.index.IndexCursor.find(IndexCursor.java:163)
	at org.h2.table.TableFilter.next(TableFilter.java:498)
	at org.h2.command.dml.Select$LazyResultQueryFlat.fetchNextRow(Select.java:1843)
	at org.h2.result.LazyResult.hasNext(LazyResult.java:101)
	at org.h2.result.LazyResult.next(LazyResult.java:60)
	at org.h2.command.dml.Select.queryFlat(Select.java:737)
	at org.h2.command.dml.Select.queryWithoutCache(Select.java:844)
	at org.h2.command.dml.Query.queryWithoutCacheLazyCheck(Query.java:201)
	at org.h2.command.dml.Query.query(Query.java:489)
	at org.h2.command.dml.Query.query(Query.java:451)
	at org.h2.command.CommandContainer.query(CommandContainer.java:285)
	at org.h2.command.Command.executeQuery(Command.java:195)
	... 14 more

observed in https://github.com/trinodb/trino/runs/5048548001?check_suite_focus=true

cc: @kokosing

[findepi]

Reproduces locally

cc @kokosing