presto-main/src/main/java/io/prestosql/cost/TableScanStatsRule.java/TableScanStatsRule/TableScanStatsRule
class TableScanStatsRule:    public TableScanStatsRule(Metadata metadata, StatsNormalizer normalizer)
    {
        super(normalizer); // Use stats normalization since connector can return inconsistent stats values
        this.metadata = requireNonNull(metadata, "metadata is null");
    }