HyukjinKwon commented on a change in pull request #34905:
URL: https://github.com/apache/spark/pull/34905#discussion_r769305397
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File path: docs/sql-migration-guide.md
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@@ -52,6 +52,8 @@ license: |
- Since Spark 3.3, the `strfmt` in `format_string(strfmt, obj, ...)` and
`printf(strfmt, obj, ...)` will no longer support to use "0$" to specify the
first argument, the first argument should always reference by "1$" when use
argument index to indicating the position of the argument in the argument list.
+ - Since Spark 3.3, nulls are written as empty strings in CSV data source by
default. In Spark 3.2 or earlier, nulls were written as empty strings as quoted
empty strings, `""`. To restore the previous behavior, set `nullValue` to `""`.
Review comment:
Let me just merge as is ...
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