gianm commented on a change in pull request #8047: optimize single input column
multi-value expressions
URL: https://github.com/apache/incubator-druid/pull/8047#discussion_r309002377
##########
File path: core/src/main/java/org/apache/druid/math/expr/ApplyFunction.java
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@@ -60,6 +60,17 @@
*/
Set<Expr> getArrayInputs(List<Expr> args);
+ /**
+ * Returns true if apply function produces an array output
+ */
+ default boolean hasArrayOutput()
+ {
+ return false;
Review comment:
What if a function might sometimes return an array and might sometimes
return a scalar? Is that:
- Not allowed (functions should not differ in their return types in this way)
- Allowed, and `hasArrayOutput` should be `true`
- Allowed, and `hasArrayOutput` should be `false`
Please adjust the javadocs appropriately.
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