Github user mathieulongtin commented on the pull request:
https://github.com/apache/spark/pull/12494#issuecomment-212934930
Whether null is acceptable for a given data source's options is beside the
point. If I give bad options, I should get an exception, the same way I get an
exception if I give any other wrong value. For example, I get an exception if I
set the quote to "XYZ" with the csv datasource because it only accepts a single
character.
The PR I submitted was about allowing Python to do the same thing as Scala.
This brings one question, can you specify NULL in SQL, like this:
```
CREATE TABLE cars
USING com.databricks.spark.csv
OPTIONS (path "cars.csv", header "true", inferSchema "true", quote NULL)
```
If not, then we should disable it entirely so that SQL, Scala and Python
all can do the same thing.
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