presto-memory/src/main/java/io/prestosql/plugin/memory/MemoryMetadata.java/MemoryMetadata/getViews
class MemoryMetadata:    @Override
    public synchronized Map<SchemaTableName, ConnectorViewDefinition> getViews(ConnectorSession session, Optional<String> schemaName)
    {
        SchemaTablePrefix prefix = schemaName.map(SchemaTablePrefix::new).orElseGet(SchemaTablePrefix::new);
        return ImmutableMap.copyOf(Maps.filterKeys(views, prefix::matches));
    }