How to reduce query size with many repeated UNION subqueries?

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How to reduce query size with many repeated UNION subqueries?
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(dba.stackexchange.com/users/76339/vitalii-vitrenko)Vitalii Vitrenko |
(dba.stackexchange.com/users/3684/erwin-brandstetter)Erwin Brandstetter |
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postgresql execution-plan postgresql-performance query-performance union







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execution-plan
postgresql-performance
query-performance
union