split function behave differently between spark 2.3 and spark 3.2

while use split function in sql, it behave differently between 2.3 and 3.2, which cause incorrect problem.

we can use this sql to reproduce this problem:

create table split_test ( id int,name string)

insert into split_test values(1,"abc;def")

explain extended select split(name,'\\\\;') from split_test

spark3:

spark-sql> Explain extended select split(name,'\\\\;') from split_test;

== Parsed Logical Plan ==

'Project [unresolvedalias('split('name, \\;), None)]

+- 'UnresolvedRelation [split_test], [], false

spark2:

spark-sql> Explain extended select split(name,'\\\\;') from split_test;

== Parsed Logical Plan ==

'Project [unresolvedalias('split('name, \;), None)]

+- 'UnresolvedRelation split_test

It looks like the deal of escape is different