Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/22396#discussion_r217897114
--- Diff: docs/sql-programming-guide.md ---
@@ -1898,6 +1898,7 @@ working with timestamps in `pandas_udf`s to get the
best performance, see
- Since Spark 2.4, File listing for compute statistics is done in
parallel by default. This can be disabled by setting
`spark.sql.parallelFileListingInStatsComputation.enabled` to `False`.
- Since Spark 2.4, Metadata files (e.g. Parquet summary files) and
temporary files are not counted as data files when calculating table size
during Statistics computation.
- Since Spark 2.4, empty strings are saved as quoted empty strings `""`.
In version 2.3 and earlier, empty strings are equal to `null` values and do not
reflect to any characters in saved CSV files. For example, the row of `"a",
null, "", 1` was writted as `a,,,1`. Since Spark 2.4, the same row is saved as
`a,,"",1`. To restore the previous behavior, set the CSV option `emptyValue` to
empty (not quoted) string.
+ - Since Spark 2.4 load command from local filesystem supports wildcards
in the folder level paths(e.g. LOAD DATA LOCAL INPATH 'tmp/folder*/).Also in
Older versions space in folder/file names has been represented using '%20'(e.g.
LOAD DATA INPATH 'tmp/folderName/myFile%20Name.csv), this usage will not be
supported from spark 2.4 version. Since Spark 2.4, Spark supports normal space
character in folder/file names (e.g. LOAD DATA INPATH
'hdfs://tmp/folderName/file Name.csv') and wildcard character '?' can be used.
(e.g. LOAD DATA INPATH 'hdfs://tmp/folderName/fileName?.csv')
--- End diff --
Why we only mention the space character?
```
val p2 = new Path(new URI("a%30b"))
print(p2)
val p = new Path("a%30b")
print(p)
```
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