### Question:
TpchMetadata implements ConnectorMetadata { @Override public boolean schemaExists(ConnectorSession session, String schemaName) { return schemaNameToScaleFactor(schemaName) > 0; } TpchMetadata();  TpchMetadata(ColumnNaming columnNaming, boolean predicatePushdownEnabled, boolean partitioningEnabled); @Override boolean schemaExists(ConnectorSession session, String schemaName); @Override List<String> listSchemaNames(ConnectorSession session); @Override TpchTableHandle getTableHandle(ConnectorSession session, SchemaTableName tableName); @Override ConnectorTableHandle getTableHandleForStatisticsCollection(ConnectorSession session, SchemaTableName tableName, Map<String, Object> analyzeProperties); @Override ConnectorTableMetadata getTableMetadata(ConnectorSession session, ConnectorTableHandle tableHandle); @Override Map<String, ColumnHandle> getColumnHandles(ConnectorSession session, ConnectorTableHandle tableHandle); @Override Map<SchemaTableName, List<ColumnMetadata>> listTableColumns(ConnectorSession session, SchemaTablePrefix prefix); @Override TableStatistics getTableStatistics(ConnectorSession session, ConnectorTableHandle tableHandle, Constraint constraint); @Override TableStatisticsMetadata getStatisticsCollectionMetadata(ConnectorSession session, ConnectorTableMetadata tableMetadata); @Override ConnectorTableHandle beginStatisticsCollection(ConnectorSession session, ConnectorTableHandle tableHandle); @Override void finishStatisticsCollection(ConnectorSession session, ConnectorTableHandle tableHandle, Collection<ComputedStatistics> computedStatistics); @Override ColumnMetadata getColumnMetadata(ConnectorSession session, ConnectorTableHandle tableHandle, ColumnHandle columnHandle); @Override List<SchemaTableName> listTables(ConnectorSession session, Optional<String> filterSchema); @Override boolean usesLegacyTableLayouts(); @Override ConnectorTableProperties getTableProperties(ConnectorSession session, ConnectorTableHandle table); @Override Optional<ConstraintApplicationResult<ConnectorTableHandle>> applyFilter(ConnectorSession session, ConnectorTableHandle table, Constraint constraint); static double schemaNameToScaleFactor(String schemaName); static Type getPrestoType(TpchColumn<?> column); static final String TINY_SCHEMA_NAME; static final double TINY_SCALE_FACTOR; static final List<String> SCHEMA_NAMES; static final String ROW_NUMBER_COLUMN_NAME; }### Answer:
@Test public void testHiddenSchemas() { assertTrue(tpchMetadata.schemaExists(session, "sf1")); assertTrue(tpchMetadata.schemaExists(session, "sf3000.0")); assertFalse(tpchMetadata.schemaExists(session, "sf0")); assertFalse(tpchMetadata.schemaExists(session, "hf1")); assertFalse(tpchMetadata.schemaExists(session, "sf")); assertFalse(tpchMetadata.schemaExists(session, "sfabc")); }