samples/doris-demo/remote-udaf-python-demo/README.md

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# Remote UDAF Function Service In Python Demo

## Compile 
1. `pip install grpcio-tools`
2. `python -m grpc_tools.protoc -Iproto --python_out=. --grpc_python_out=. proto/function_service.proto &&  python -m grpc_tools.protoc -Iproto --python_out=. proto/types.proto`

# Run

`python function_server_demo.py 9000`
`9000` is the port that the server will listen on

# Demo


```
//create one table such as table2
CREATE TABLE `table2` (
  `event_day` date NULL,
  `siteid` int(11) NULL DEFAULT "10",
  `citycode` smallint(6) NULL,
  `visitinfo` varchar(1024) NULL DEFAULT "",
  `pv` varchar(1024) REPLACE NULL DEFAULT "0"
) ENGINE=OLAP
AGGREGATE KEY(`event_day`, `siteid`, `citycode`, `visitinfo`)
COMMENT 'OLAP'
DISTRIBUTED BY HASH(`siteid`) BUCKETS 10
PROPERTIES (
"replication_allocation" = "tag.location.default: 1",
"in_memory" = "false",
"storage_format" = "V2"
)
//import some data 
MySQL [test_db]> select * from table2;
+------------+--------+----------+------------------------------------+------+
| event_day  | siteid | citycode | visitinfo                           | pv   |
+------------+--------+----------+------------------------------------+------+
| 2017-07-03 |      8 |       12 | {"ip":"192.168.0.5","source":"pc"} | 81   |
| 2017-07-03 |     37 |       12 | {"ip":"192.168.0.3","source":"pc"} | 81   |
| 2017-07-03 |     67 |       16 | {"ip":"192.168.0.2","source":"pc"} | 79   |
| 2017-07-03 |    101 |       11 | {"ip":"192.168.0.5","source":"pc"} | 65   |
| 2017-07-03 |     32 |       15 | {"ip":"192.168.0.1","source":"pc"} | 188  |
| 2017-07-03 |    103 |       12 | {"ip":"192.168.0.5","source":"pc"} | 123  |
| 2017-07-03 |    104 |       16 | {"ip":"192.168.0.5","source":"pc"} | 79   |
| 2017-07-03 |      3 |       12 | {"ip":"192.168.0.3","source":"pc"} | 123  |
| 2017-07-03 |      3 |       15 | {"ip":"192.168.0.2","source":"pc"} | 188  |
| 2017-07-03 |     13 |       11 | {"ip":"192.168.0.1","source":"pc"} | 65   |
| 2017-07-03 |     53 |       12 | {"ip":"192.168.0.2","source":"pc"} | 123  |
| 2017-07-03 |      1 |       11 | {"ip":"192.168.0.1","source":"pc"} | 65   |
| 2017-07-03 |      7 |       16 | {"ip":"192.168.0.4","source":"pc"} | 79   |
| 2017-07-03 |    102 |       15 | {"ip":"192.168.0.5","source":"pc"} | 188  |
| 2017-07-03 |    105 |       12 | {"ip":"192.168.0.5","source":"pc"} | 81   |
+------------+--------+----------+------------------------------------+------+
```

### 1. find most visit top 3 ip 
```
MySQL [test_db]> CREATE AGGREGATE FUNCTION  rpc_count_visit_info(varchar(1024)) RETURNS varchar(1024) PROPERTIES (
    "TYPE"="RPC",
    "OBJECT_FILE"="127.0.0.1:9000",
    "update_fn"="rpc_count_visit_info_update",
    "merge_fn"="rpc_count_visit_info_merge",
    "finalize_fn"="rpc_count_visit_info_finalize"
);
MySQL [test_db]> select rpc_count_visit_info(visitinfo) from table2;
+--------------------------------------------+
| rpc_count_visit_info(`visitinfo`)           |
+--------------------------------------------+
| 192.168.0.5:6 192.168.0.2:3 192.168.0.1:3  |
+--------------------------------------------+
1 row in set (0.036 sec)
MySQL [test_db]> select citycode, rpc_count_visit_info(visitinfo) from table2 group by citycode;
+----------+--------------------------------------------+
| citycode | rpc_count_visit_info(`visitinfo`)           |
+----------+--------------------------------------------+
|       15 | 192.168.0.2:1 192.168.0.1:1 192.168.0.5:1  |
|       11 | 192.168.0.1:2 192.168.0.5:1                |
|       12 | 192.168.0.5:3 192.168.0.3:2 192.168.0.2:1  |
|       16 | 192.168.0.2:1 192.168.0.4:1 192.168.0.5:1  |
+----------+--------------------------------------------+
4 rows in set (0.050 sec)
```
### 2. sum pv 
```
CREATE AGGREGATE FUNCTION  rpc_sum(bigint) RETURNS bigint PROPERTIES (
    "TYPE"="RPC",
    "OBJECT_FILE"="127.0.0.1:9700",
    "update_fn"="rpc_sum_update",
    "merge_fn"="rpc_sum_merge",
    "finalize_fn"="rpc_sum_finalize"
);
MySQL [test_db]> select citycode, rpc_sum(pv) from table2 group by citycode;
+----------+---------------+
| citycode | rpc_sum(`pv`) |
+----------+---------------+
|       15 |           564 |
|       11 |           195 |
|       12 |           612 |
|       16 |           237 |
+----------+---------------+
4 rows in set (0.067 sec)
MySQL [test_db]> select rpc_sum(pv) from table2;
+---------------+
| rpc_sum(`pv`) |
+---------------+
|          1608 |
+---------------+
1 row in set (0.030 sec)
```

### 3. avg pv

```
CREATE AGGREGATE FUNCTION  rpc_avg(int) RETURNS double PROPERTIES (
    "TYPE"="RPC",
    "OBJECT_FILE"="127.0.0.1:9000",
    "update_fn"="rpc_avg_update",
    "merge_fn"="rpc_avg_merge",
    "finalize_fn"="rpc_avg_finalize"
);
MySQL [test_db]> select citycode, rpc_avg(pv) from table2 group by citycode;
+----------+---------------+
| citycode | rpc_avg(`pv`) |
+----------+---------------+
|       15 |           188 |
|       11 |            65 |
|       12 |           102 |
|       16 |            79 |
+----------+---------------+
4 rows in set (0.039 sec)
MySQL [test_db]> select rpc_avg(pv) from table2;
+---------------+
| rpc_avg(`pv`) |
+---------------+
|         107.2 |
+---------------+
1 row in set (0.028 sec)
```