AngersZhuuuu opened a new pull request #34616:
URL: https://github.com/apache/spark/pull/34616
### What changes were proposed in this pull request?
Before Spark 3, if we pass a SQL like
`select split('Spark SQL', '\;')`
to spark-sql, after process, it will actually execute
`select split('Spark SQL', ';')`
spark-sql with verbose
```
[info] 2021-11-16 18:05:34.86 - stdout> spark-sql> select
split('dawdawdawd','\;');
[info] 2021-11-16 18:05:34.875 - stdout> select split('dawdawdawd',';')
```
But after Spark 3
It will execute `select split('Spark SQL', '\;')` as origin.
spark-sql with verbose
```
[info] 2021-11-16 18:05:34.86 - stdout> spark-sql> select
split('dawdawdawd','\;');
[info] 2021-11-16 18:05:34.875 - stdout> select split('dawdawdawd','\;')
```
In this PR we doc this change.
### Why are the changes needed?
Update migration guide
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Not need
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