paul-rogers commented on a change in pull request #1896: DRILL-7441: Fix issues
with fillEmpties, offset vectors
URL: https://github.com/apache/drill/pull/1896#discussion_r347010087
##########
File path: exec/vector/src/main/codegen/templates/NullableValueVectors.java
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@@ -844,29 +841,35 @@ public void generateTestData(int valueCount) {
@Override
public void reset() {
- setCount = 0;
<#if type.major = "VarLen">lastSet = -1;</#if>
}
<#if type.major = "VarLen">
@VisibleForTesting
public int getLastSet() { return lastSet; }
-
+
</#if>
+ @Override
+ public void setSetCount(int n) {
+ <#if type.major = "VarLen">lastSet = n - 1;</#if>
+ }
+
// For nullable vectors, exchanging buffers (done elsewhere)
// requires also exchanging mutator state (done here.)
@Override
public void exchange(ValueVector.Mutator other) {
- final Mutator target = (Mutator) other;
- int temp = setCount;
- setCount = target.setCount;
- target.setCount = temp;
+ <#if type.major == "VarLen">
Review comment:
This is a bit subtle. The old code exchanged the `setCount` variable. But,
it turned out that `setCount` was never actually used, so I removed it.
However, this code contained a bug: it did not exchange the `lastSet` field,
which is actually used. So, I added the code to exchange `lastSet`. But,
`lastSet` is defined only for variable width types, where it is used to
backfill the offset vectors.
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