presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/MetadataDao.java/MetadataDao/insertDistribution
class MetadataDao:    @SqlUpdate("INSERT INTO distributions (distribution_name, column_types, bucket_count)\n" +
            "VALUES (:distributionName, :columnTypes, :bucketCount)")
    @GetGeneratedKeys
    long insertDistribution(
            @Bind("distributionName") String distributionName,
            @Bind("columnTypes") String columnTypes,
            @Bind("bucketCount") int bucketCount);