Github user jurriaan commented on the pull request:
https://github.com/apache/spark/pull/13267#issuecomment-221380701
@rxin
An example using the following dataframe:
```
spark.createDataFrame([['test "quote"', 123, 'it "works"!', '"very" well']])
```
The default CSV behaviour will save the data like this when you specify `"`
as quote and as escape char:
```
test "quote",123,it "works"!,"""very"" well"
```
With quoteEscapingEnabled set to true the output looks like this:
```
"test ""quote""",123,"it ""works""!","""very"" well"
```
As you can see the default does wrap a value in quotes only if it starts
with quotes. When quoteEscapingEnabled is turned on it wraps all values
containing quotation characters in quotes. This is needed in some CSV dialects.
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