Fix over-limiting the number of threads for union. #12103
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alexey-milovidov
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…52d9844f43251cbe61ace74bf862c Cherry pick #12103 to 20.5: Fix over-limiting the number of threads for union.
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Fix over-limiting the number of threads for union. (cherry picked from commit cbb539c)
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Fix over-limiting the number of threads for union. (cherry picked from commit cbb539c)
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Fix performance for selects with
UNIONcaused by wrong limit for the total number of threads. Fixes #12030