presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/glue/GlueHiveMetastore.java/GlueHiveMetastore/addColumn
class GlueHiveMetastore:    @Override
    public void addColumn(HiveIdentity identity, String databaseName, String tableName, String columnName, HiveType columnType, String columnComment)
    {
        Table oldTable = getExistingTable(identity, databaseName, tableName);
        Table newTable = Table.builder(oldTable)
                .addDataColumn(new Column(columnName, columnType, Optional.ofNullable(columnComment)))
                .build();
        replaceTable(identity, databaseName, tableName, newTable, null);
    }