presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/SemiTransactionalHiveMetastore.java/SemiTransactionalHiveMetastore/dropColumn
class SemiTransactionalHiveMetastore:    public synchronized void dropColumn(HiveIdentity identity, String databaseName, String tableName, String columnName)
    {
        setExclusive((delegate, hdfsEnvironment) -> delegate.dropColumn(identity, databaseName, tableName, columnName));
    }