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What kind of change does this PR introduce?
Feature
What is the current behavior?
Field merging doesn't work because it was reverted recently.
What is the new behavior?
Fields at the same level will be merged according to the GraphQL spec. The new algo is O(n) in the total number of fields and is much faster than the old algo. Tests from the old algo are also included with more added to cover additional cases.
Additional context
N/A