Github user hyunsik commented on a diff in the pull request:
https://github.com/apache/tajo/pull/161#discussion_r18318014
--- Diff:
tajo-core/src/main/java/org/apache/tajo/master/querymaster/Query.java ---
@@ -432,19 +432,68 @@ public Path commitOutputData(Query query) {
boolean movedToOldTable = false;
boolean committed = false;
Path oldTableDir = new Path(queryContext.getStagingDir(),
TajoConstants.INSERT_OVERWIRTE_OLD_TABLE_NAME);
- try {
- if (fs.exists(finalOutputDir)) {
- fs.rename(finalOutputDir, oldTableDir);
- movedToOldTable = fs.exists(oldTableDir);
- } else { // if the parent does not exist, make its parent
directory.
- fs.mkdirs(finalOutputDir.getParent());
+
+ // INSERT OVERWRITE INTO always moves the result data into the
original table location.
+ // As a result, all existing partitions have been removed. The
query should not remove all partitions
--- End diff --
I think that you don't need to the story about the old implementation. It
would be better if you explain what the below code does.
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