### Question:
TpcdsMetadata implements ConnectorMetadata { @Override public boolean schemaExists(ConnectorSession session, String schemaName) { return schemaNameToScaleFactor(schemaName) > 0; } TpcdsMetadata(); @Override boolean schemaExists(ConnectorSession session, String schemaName); @Override List<String> listSchemaNames(ConnectorSession session); @Override ConnectorTableHandle getTableHandle(ConnectorSession session, SchemaTableName tableName); @Override List<ConnectorTableLayoutResult> getTableLayouts(
            ConnectorSession session,
            ConnectorTableHandle table,
            Constraint constraint,
            Optional<Set<ColumnHandle>> desiredColumns); @Override ConnectorTableLayout getTableLayout(ConnectorSession session, ConnectorTableLayoutHandle handle); @Override ConnectorTableMetadata getTableMetadata(ConnectorSession session, ConnectorTableHandle tableHandle); @Override TableStatistics getTableStatistics(ConnectorSession session, ConnectorTableHandle tableHandle, Constraint constraint); @Override Map<String, ColumnHandle> getColumnHandles(ConnectorSession session, ConnectorTableHandle tableHandle); @Override ColumnMetadata getColumnMetadata(ConnectorSession session, ConnectorTableHandle tableHandle, ColumnHandle columnHandle); @Override Map<SchemaTableName, List<ColumnMetadata>> listTableColumns(ConnectorSession session, SchemaTablePrefix prefix); @Override List<SchemaTableName> listTables(ConnectorSession session, Optional<String> filterSchema); static double schemaNameToScaleFactor(String schemaName); static Type getPrestoType(ColumnType tpcdsType); static final String TINY_SCHEMA_NAME; static final double TINY_SCALE_FACTOR; static final List<String> SCHEMA_NAMES; }### Answer:
@Test public void testHiddenSchemas() { assertTrue(tpcdsMetadata.schemaExists(session, "sf1")); assertTrue(tpcdsMetadata.schemaExists(session, "sf3000.0")); assertFalse(tpcdsMetadata.schemaExists(session, "sf0")); assertFalse(tpcdsMetadata.schemaExists(session, "hf1")); assertFalse(tpcdsMetadata.schemaExists(session, "sf")); assertFalse(tpcdsMetadata.schemaExists(session, "sfabc")); }