924060929 commented on code in PR #14380:
URL: https://github.com/apache/doris/pull/14380#discussion_r1026295580
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fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/agg/HllUnion.java:
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@@ -32,7 +32,11 @@
/** HllUnion */
public class HllUnion extends AggregateFunction
- implements UnaryExpression, PropagateNullable, ImplicitCastInputTypes {
+ implements UnaryExpression, AlwaysNotNullable,
ExplicitlyCastableSignature {
+ public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
+ FunctionSignature.ret(HllType.INSTANCE).args(HllType.INSTANCE)
+ );
+
public HllUnion(Expression arg0) {
// TODO: change to hll_union in the future
Review Comment:
In the past, we can not find hll_union in frontend's FunctionSet.
Now, we don't need to find function in FunctionSet, so hll_union is available
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