ihuzenko commented on a change in pull request #1929: DRILL-6832: Remove the
old "unmanaged" external sort
URL: https://github.com/apache/drill/pull/1929#discussion_r360508494
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/xsort/MSortTemplate.java
##########
@@ -89,15 +98,28 @@ public void setup(final FragmentContext context, final
BufferAllocator allocator
* ExternalSortBatch to make decisions about whether to spill or not.
*
* @param recordCount
- * @return The amount of memory MSorter needs for a given record count.
+ * @return
*/
public static long memoryNeeded(final int recordCount) {
- // We need 4 bytes (SV4) for each record, power of 2 rounded.
+ // We need 4 bytes (SV4) for each record.
+ // The memory allocator will round this to the next
+ // power of 2.
return BaseAllocator.nextPowerOfTwo(recordCount * 4);
}
- private int merge(final int leftStart, final int rightStart, final int
rightEnd, final int outStart) {
+ /**
+ * Given two regions within the selection vector 4 (a left and a right),
merge
+ * the two regions to produce a combined output region in the auxiliary
+ * selection vector.
+ *
+ * @param leftStart
+ * @param rightStart
+ * @param rightEnd
+ * @param outStart
+ * @return
Review comment:
please finish the javadoc
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