jihoonson commented on a change in pull request #5958: Part 2 of changes for
SQL Compatible Null Handling
URL: https://github.com/apache/incubator-druid/pull/5958#discussion_r201193939
##########
File path:
extensions-core/lookups-cached-single/src/main/java/io/druid/server/lookup/LoadingLookup.java
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@@ -62,15 +63,19 @@ public LoadingLookup(
@Override
- public String apply(final String key)
+ public String apply(@Nullable final String key)
{
- if (key == null) {
+ String keyEquivalent = NullHandling.nullToEmptyIfNeeded(key);
Review comment:
I thought this kind of null value conversion is needed only when retrieving
values from the storage layer (like in `ColumnValueSelector`), so that we
expect `key` is already converted to some default value if needed. But,
apparently it seems not. Would you explain why this is needed after retrieving
values?
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