Github user zuotingbing commented on the issue:
https://github.com/apache/spark/pull/17858
In this case, Hive will create the staging directory under the table
directory, and when moving staging directory to table directory, Hive will
still empty the table directory, but will exclude the staging directory which
start with "." or "_"
`public static final PathFilter HIDDEN_FILES_PATH_FILTER = new PathFilter()
{
public boolean accept(Path p) {
String name = p.getName();
return !name.startsWith("_") && !name.startsWith(".");
}
};`
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