Github user sunjincheng121 commented on the issue:
https://github.com/apache/flink/pull/4111
For example (from test case):
You can run
`org.apache.flink.table.api.java.batch.TableEnvironmentITCase#testAsFromAndToPrivateFieldPojo`
* input1:
```
0=age(Integer)
1=department(String)
2=name(String)
3=(Double)
```
* input1Mapping:
```
0=1
1=0
2=3
3=2
```
Using this PR code logic,we get:
input1AccessExprs:
```
0=String
1=Integer
2=Double
3=String
```
If Using `for (i <- 0 until input1.getArity if input1Mapping.contains(i))`
and delete you mentioned code.we get:
input1AccessExprs:
```
0=Integer
1=String
2=String
3=Double
```
That not we want, then the following code will throw exception:
`Incompatible types of expression and result type.`
I try to express my point clearly. But feel free to tell me If there
something not enough.
Thanks,
SunJincheng
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