[
https://issues.apache.org/jira/browse/HIVE-23975?focusedWorklogId=465556&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-465556
]
ASF GitHub Bot logged work on HIVE-23975:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 03/Aug/20 05:48
Start Date: 03/Aug/20 05:48
Worklog Time Spent: 10m
Work Description: rbalamohan commented on a change in pull request #1352:
URL: https://github.com/apache/hive/pull/1352#discussion_r464204771
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/VectorGroupByOperator.java
##########
@@ -514,7 +526,8 @@ private void
prepareBatchAggregationBufferSets(VectorizedRowBatch batch) throws
// is very important to clone the keywrapper, the one we have from
our
// keyWrappersBatch is going to be reset/reused on next batch.
aggregationBuffer = allocateAggregationBuffer();
Review comment:
allocateAggregationBuffer can be reused with the flushed out entries.
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/wrapper/VectorHashKeyWrapperGeneral.java
##########
@@ -262,6 +255,138 @@ private void duplicateTo(VectorHashKeyWrapperGeneral
clone) {
clone.hashcode = hashcode;
assert clone.equals(this);
+
+ return clone;
+ }
+
+ private long[] copyInPlaceOrAllocate(long[] from, long[] to) {
+ if (from.length > 0) {
+ if (to != null && to.length == from.length) {
+ System.arraycopy(from, 0, to, 0, from.length);
+ return to;
+ } else {
+ return from.clone();
+ }
+ } else {
+ return EMPTY_LONG_ARRAY;
+ }
+ }
+
+ private double[] copyInPlaceOrAllocate(double[] from, double[] to) {
+ if (from.length > 0) {
+ if (to != null && to.length == from.length) {
+ System.arraycopy(from, 0, to, 0, from.length);
+ return to;
+ } else {
+ return from.clone();
+ }
+ } else {
+ return EMPTY_DOUBLE_ARRAY;
+ }
+ }
+
+ private boolean[] copyInPlaceOrAllocate(boolean[] from, boolean[] to) {
+ if (to != null && to.length == from.length) {
+ System.arraycopy(from, 0, to, 0, from.length);
+ return to;
+ } else {
+ return from.clone();
+ }
+ }
+
+ private HiveDecimalWritable[] copyInPlaceOrAllocate(HiveDecimalWritable[]
from, HiveDecimalWritable[] to) {
+ if (from.length > 0) {
+ if (to == null || to.length != from.length) {
+ to = new HiveDecimalWritable[from.length];
+ }
+ for (int i = 0; i < from.length; i++) {
+ to[i] = new HiveDecimalWritable(from[i]);
+ }
+ return to;
+ } else {
+ return EMPTY_DECIMAL_ARRAY;
+ }
+ }
+
+ private Timestamp[] copyInPlaceOrAllocate(Timestamp[] from, Timestamp[] to) {
+ if (from.length > 0) {
+ if (to == null || to.length != from.length) {
+ to = new Timestamp[from.length];
+ }
+ for (int i = 0; i < from.length; i++) {
+ to[i] = (Timestamp) from[i].clone();
+ }
+ return to;
+ } else {
+ return EMPTY_TIMESTAMP_ARRAY;
+ }
+ }
+
+ @Override
+ public void copyKey(KeyWrapper oldWrapper) {
+ VectorHashKeyWrapperGeneral clone = (VectorHashKeyWrapperGeneral)
oldWrapper;
+ clone.hashCtx = hashCtx;
+ clone.keyCount = keyCount;
+ clone.longValues = copyInPlaceOrAllocate(longValues, clone.longValues);
+ clone.doubleValues = copyInPlaceOrAllocate(doubleValues,
clone.doubleValues);
+ clone.isNull = copyInPlaceOrAllocate(isNull, clone.isNull);
+ clone.decimalValues = copyInPlaceOrAllocate(decimalValues,
clone.decimalValues);
+
+ if (byteLengths.length > 0) {
+ if (clone.byteLengths == null || clone.byteValues.length !=
byteValues.length) {
+ // byteValues and byteStarts are always the same length
+ clone.byteValues = new byte[byteValues.length][];
+ clone.byteStarts = new int[byteValues.length];
+ clone.byteLengths = byteLengths.clone();
+ for (int i = 0; i < byteValues.length; ++i) {
+ // avoid allocation/copy of nulls, because it potentially expensive.
+ // branch instead.
+ if (byteLengths[i] != -1) {
+ clone.byteValues[i] = Arrays.copyOfRange(byteValues[i],
+ byteStarts[i], byteStarts[i] + byteLengths[i]);
+ }
+ }
+ } else {
+ System.arraycopy(byteLengths, 0, clone.byteLengths, 0,
byteValues.length);
+ Arrays.fill(byteStarts, 0);
+ System.arraycopy(byteStarts, 0, clone.byteStarts, 0,
byteValues.length);
+ for (int i = 0; i < byteValues.length; ++i) {
+ // avoid allocation/copy of nulls, because it potentially expensive.
+ // branch instead.
+ if (byteLengths[i] != -1) {
+ if (clone.byteValues[i] != null && clone.byteValues[i].length >=
byteValues[i].length) {
+ System.arraycopy(byteValues[i], byteStarts[i],
clone.byteValues[i], 0, byteLengths[i]);
+ } else {
+ clone.byteValues[i] = Arrays.copyOfRange(byteValues[i],
+ byteStarts[i], byteStarts[i] + byteLengths[i]);
Review comment:
Why is this needed? Wouldn't be it always from 0 - bytelength?
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Issue Time Tracking
-------------------
Worklog Id: (was: 465556)
Time Spent: 20m (was: 10m)
> Reuse evicted keys from aggregation buffers
> -------------------------------------------
>
> Key: HIVE-23975
> URL: https://issues.apache.org/jira/browse/HIVE-23975
> Project: Hive
> Issue Type: Improvement
> Reporter: Mustafa Iman
> Assignee: Mustafa Iman
> Priority: Major
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
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