FrankChen021 commented on code in PR #5283:
URL: https://github.com/apache/calcite/pull/5283#discussion_r4115153339
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core/src/main/java/org/apache/calcite/rex/RexShuttle.java:
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@@ -163,15 +163,30 @@ protected RexNode[] visitArray(RexNode[] exprs, boolean
@Nullable [] update) {
*/
protected List<RexNode> visitList(
List<? extends RexNode> exprs, boolean @Nullable [] update) {
- ImmutableList.Builder<RexNode> clonedOperands = ImmutableList.builder();
+ ImmutableList.@Nullable Builder<RexNode> clonedOperands = null;
+ int i = 0;
for (RexNode operand : exprs) {
RexNode clonedOperand = operand.accept(this);
- if ((clonedOperand != operand) && (update != null)) {
- update[0] = true;
+ if (clonedOperand != operand && clonedOperands == null) {
+ clonedOperands = ImmutableList.builder();
Review Comment:
Calcite supports Guava 21, where `builderWithExpectedSize` is unavailable,
so I retained `ImmutableList.builder()`.
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