fix(union): union's pairs are handled incorrectly

[xudong963]

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Summary

Summary about this PR

Closes #8493

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1 Ignored Deployment

Name	Status	Preview	Updated
databend	⬜️ Ignored (Inspect)		Nov 5, 2022 at 4:40AM (UTC)

[xudong963]

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[xudong963]

error: failed to get `arrow2` as a dependency of package `common-arrow v0.1.0 (/workspace/src/common/arrow)`

Caused by:
  failed to load source for dependency `arrow2`

Caused by:
  Unable to update https://github.com/RinChanNOWWW/arrow2?rev=8bd6417#8bd64173

Caused by:
  object not found - no match for id (8bd6417392a44496a2f9ca649f9cd2aa65dcc277); class=Odb (9); code=NotFound (-3)

[FANNG1]

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[xudong963]

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