etcd: Simplifying filterRangeResults with Explicit Logic

Problem

The filterRangeResults function in etcd used complex boolean logic that was hard to read and extend. Multiple filter conditions were combined with nested boolean operators.

Solution

Refactored to use explicit if statements with guard clauses at the beginning of the function. Each filter case is now handled separately, making the logic flow clear.

Result

Improved code readability for a critical path in etcd's KV store. Explicit logic reduces the chance of subtle bugs in edge cases.

Commit: etcd-io/etcd@41ad7ef