Jackie-Jiang commented on a change in pull request #7707:
URL: https://github.com/apache/pinot/pull/7707#discussion_r743934438
##########
File path:
pinot-core/src/main/java/org/apache/pinot/core/operator/transform/function/LiteralTransformFunction.java
##########
@@ -128,64 +122,88 @@ public Dictionary getDictionary() {
@Override
public int[] transformToIntValuesSV(ProjectionBlock projectionBlock) {
- if (_intResult == null) {
- _intResult = new int[DocIdSetPlanNode.MAX_DOC_PER_CALL];
+ int numDocs = projectionBlock.getNumDocs();
+ Object ref = _result;
Review comment:
Any performance benefit of caching member variable into a local variable?
##########
File path:
pinot-core/src/main/java/org/apache/pinot/core/operator/transform/function/LiteralTransformFunction.java
##########
@@ -128,64 +122,88 @@ public Dictionary getDictionary() {
@Override
public int[] transformToIntValuesSV(ProjectionBlock projectionBlock) {
- if (_intResult == null) {
- _intResult = new int[DocIdSetPlanNode.MAX_DOC_PER_CALL];
+ int numDocs = projectionBlock.getNumDocs();
+ Object ref = _result;
+ if (!(ref instanceof int[]) || ((int[]) ref).length < numDocs) {
Review comment:
Per the current way of query execution, we can make the following
assumptions:
1. Only one type of the result will be read
2. The first projection block will contain the most `numDocs` (up to 10K)
With these assumptions we can change the check to
```suggestion
if (ref == null) {
...
} else {
assert (ref instanceof int[]) && ((int[]) ref).length >= numDocs;
}
```
If the assumption break, we'd better let it throw exception, or the
performance will degrade because we will end up filling the array multiple
times.
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