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Nexmark: Fix query9 window merging #18558

@kennknowles

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@kennknowles

Nexmark Query9 uses custom windows and merges them. It runs fine in spark runner even if spark runner does not support custom window merging yet (https://issues.apache.org/jira/browse/BEAM-2499). So fix the merge process in Query9 to be closer to

Imported from Jira BEAM-2945. Original Jira may contain additional context.
Reported by: echauchot.

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