aa87b0aba3
### What changes were proposed in this pull request?
In the PR, I propose to fix an issue with LibSVM datasource when both of the following are true:
* no user specified schema
* some file paths contain escaped glob metacharacters, such as `[``]`, `{``}`, `*` etc.
The fix is based on another bug fix for CSV/JSON datasources https://github.com/apache/spark/pull/29659.
### Why are the changes needed?
To fix the issue when the follow two queries try to read from paths `[abc]`:
```scala
spark.read.format("libsvm").load("""/tmp/\[abc\].csv""").show
```
but would end up hitting an exception:
```
Path does not exist: file:/private/var/folders/p3/dfs6mf655d7fnjrsjvldh0tc0000gn/T/spark-6ef0ae5e-ff9f-4c4f-9ff4-0db3ee1f6a82/[abc]/part-00000-26406ab9-4e56-45fd-a25a-491c18a05e76-c000.libsvm;
org.apache.spark.sql.AnalysisException: Path does not exist: file:/private/var/folders/p3/dfs6mf655d7fnjrsjvldh0tc0000gn/T/spark-6ef0ae5e-ff9f-4c4f-9ff4-0db3ee1f6a82/[abc]/part-00000-26406ab9-4e56-45fd-a25a-491c18a05e76-c000.libsvm;
at org.apache.spark.sql.execution.datasources.DataSource$.$anonfun$checkAndGlobPathIfNecessary$3(DataSource.scala:770)
at org.apache.spark.util.ThreadUtils$.$anonfun$parmap$2(ThreadUtils.scala:373)
at scala.concurrent.Future$.$anonfun$apply$1(Future.scala:659)
at scala.util.Success.$anonfun$map$1(Try.scala:255)
at scala.util.Success.map(Try.scala:213)
```
### Does this PR introduce _any_ user-facing change?
Yes
### How was this patch tested?
Added UT to `LibSVMRelationSuite`.
Closes #29670 from MaxGekk/globbing-paths-when-inferring-schema-ml.
Authored-by: Max Gekk <max.gekk@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
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