jihoonson commented on a change in pull request #7958: expression virtual
column selector fix for expressions which produce array types
URL: https://github.com/apache/incubator-druid/pull/7958#discussion_r297855164
##########
File path:
processing/src/main/java/org/apache/druid/segment/virtual/ExpressionSelectors.java
##########
@@ -498,7 +503,7 @@ public void inspectRuntimeShape(RuntimeShapeInspector
inspector)
*/
private static Object coerceListDimToStringArray(List val)
{
- Object[] arrayVal =
val.stream().map(Object::toString).toArray(String[]::new);
+ Object[] arrayVal = val.stream().map(x -> x != null ? x.toString() :
x).toArray(String[]::new);
Review comment:
nit: `x != null ? x.toString() : null` looks more clear to me.
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