Wrong escape character in avro.schema.url

When doing the export from hive to S3 it creates the following:
```
WITH SERDEPROPERTIES (
'avro.schema.url'='s3\\://bucket/directory/_schema.avsc')
```
and this cannot be parsed correctly
Is it possible to fix to avoid that? Because when I replace with:
```
WITH SERDEPROPERTIES (
'avro.schema.url'='s3://bucket/directory/_schema.avsc')
```
it works as expected

No file or test is identified. Start by locating the Hive-to-S3 export entry point that emits the avro.schema.url SERDEPROPERTY, then reproduce the generated SQL and compare the escaped and unescaped URLs. Done means the export produces a parsable s3:// URL without the extra escape character.

Written by the indexing model from the issue text.