abstractdog commented on code in PR #5195:
URL: https://github.com/apache/hive/pull/5195#discussion_r1570103070
##########
ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcInputFormat.java:
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@@ -1727,14 +1727,15 @@ private void populateAndCacheStripeDetails() throws
IOException {
private long computeProjectionSize(List<OrcProto.Type> fileTypes,
List<OrcProto.ColumnStatistics> stats, boolean[] fileIncluded) throws
FileFormatException {
List<Integer> internalColIds = Lists.newArrayList();
+ int rootColumn = 0;
if (fileIncluded == null) {
// Add all.
- for (int i = 0; i < fileTypes.size(); i++) {
+ for (int i = rootColumn + 1; i < fileTypes.size(); i++) {
internalColIds.add(i);
}
} else {
- for (int i = 0; i < fileIncluded.length; i++) {
- if (fileIncluded[i]) {
+ for (int i = rootColumn + 1; i < fileIncluded.length; i++) {
+ if (fileIncluded[i] && (isOriginal || i != OrcRecordUpdater.ROW +
1)) {
Review Comment:
this condition is very vague and hard to understand for an average code
reader, please include comments for every parts:
- isOriginal
- OrcRecordUpdater.ROW + 1
please add a unit test for computeProjectionSize, even if this means it has
to become @VisibleForTesting package-private
unfortunately, the current getProjectedColumnsUncompressedSize unit test
assertions tell nothing about different scenarios (they are more like noisy
q.outs :) )
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