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Update 09-udf.md

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docs/en/07-develop/09-udf.md
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@ -503,7 +503,7 @@ Now, we have finished the first PDF in Python, and learned some basic debugging
The `myfun` UDF example in sample 1 has passed, but it has two drawbacks.
1. It accepts only one column of data as input, and doesn't throw exception if you passes multiple columns.
1. It the program accepts only one column of data as input, but it doesn't throw exception if you passes multiple columns.
```sql
taos> select myfun(v1, v2) from t;
@ -514,7 +514,7 @@ taos> select myfun(v1, v2) from t;
2.302585093 |
```
2. `null` value is not processed. We except the program to throw exception and terminate if `null` is passed as input.
2. `null` value is not processed. We expect the program to throw exception and terminate if `null` is passed as input.
So, we try to optimize the process() function as below.
@ -642,7 +642,7 @@ Create and test the UDF.
create function nextsunday as '/root/udf/nextsunday.py' outputtype binary(10) language 'Python';
```
If your `taosd` is started using `systemd`, you man encounter the error below. Next we will show how to debug.
If your `taosd` is started using `systemd`, you may encounter the error below. Next we will show how to debug.
```sql
taos> select ts, nextsunday(ts) from t;
@ -826,7 +826,7 @@ CREATE OR REPLACE FUNCTION function_name AS OUTPUTTYPE int LANGUAGE 'Python';
CREATE OR REPLACE AGGREGATE FUNCTION function_name AS OUTPUTTYPE BUFSIZE buf_size int LANGUAGE 'Python';
```
Note: If keyword `AGGREGATE` used, the UDF will be treated as aggregate UDF despite what it was before; Similarly, if there is no keyword `aggregate`, the UDF will be treated as scalar function despite what it was before. 更
Note: If keyword `AGGREGATE` used, the UDF will be treated as aggregate UDF despite what it was before; Similarly, if there is no keyword `aggregate`, the UDF will be treated as scalar function despite what it was before.
5. Show the UDF