pvary commented on a change in pull request #2921:
URL: https://github.com/apache/hive/pull/2921#discussion_r793292863
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File path: ql/src/java/org/apache/hadoop/hive/ql/exec/MoveTask.java
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@@ -97,6 +101,40 @@ public MoveTask() {
super();
}
+ public void flattenUnionSubdirectories(Path sourcePath) throws HiveException
{
+ try {
+ FileSystem fs = sourcePath.getFileSystem(conf);
+ LOG.info("Checking " + sourcePath + " for subdirectories to flatten");
+ Set<Path> unionSubdirs = new HashSet<>();
+ if (fs.exists(sourcePath)) {
+ RemoteIterator<LocatedFileStatus> i = fs.listFiles(sourcePath, true);
Review comment:
You have mentioned that for ACID does not need this. Could we avoid
these calls when they are not needed? Otherwise we make every query slower
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