zhengruifeng opened a new pull request, #46300:
URL: https://github.com/apache/spark/pull/46300
### What changes were proposed in this pull request?
`UserDefinedFunction.returnType` parse the DDL string
### Why are the changes needed?
1, the return type check is missing in Python Connect;
2, to enable a group of tests;
### Does this PR introduce _any_ user-facing change?
yes
```
In [1]: import pandas as pd
In [2]: from pyspark.sql.functions import pandas_udf
In [3]: @pandas_udf("int")
...: def slen(s: pd.Series) -> pd.Series:
...: return s.str.len()
...:
In [4]: slen.returnType
```
before:
```
Out[4]: UnparsedDataType('int')
```
after:
```
Out[4]: IntegerType()
```
### How was this patch tested?
enabled tests
### Was this patch authored or co-authored using generative AI tooling?
no
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