leventov commented on a change in pull request #7350: Remove unnecessary
collection
URL: https://github.com/apache/incubator-druid/pull/7350#discussion_r274965983
##########
File path:
server/src/main/java/org/apache/druid/server/http/MetadataResource.java
##########
@@ -161,14 +153,11 @@ public Response getDatabaseSegments(
// If we haven't polled the metadata store yet, use an empty list of
datasources.
Collection<ImmutableDruidDataSource> druidDataSources =
Optional.ofNullable(metadataSegmentManager.getDataSources())
.orElse(Collections.emptyList());
-
- if (datasources != null && !datasources.isEmpty()) {
- druidDataSources = druidDataSources.stream()
- .filter(src ->
datasources.contains(src.getName()))
- .collect(Collectors.toSet());
- }
final Stream<DataSegment> metadataSegments = druidDataSources
.stream()
+ .filter((datasources != null && !datasources.isEmpty())
+ ? src -> datasources.contains(src.getName())
+ : src -> true)
Review comment:
This code is not readable.
Please extract a stream variable and apply a filter only if the condition
applies.
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