planner: fix wrong stats for physical union scan#14093

Merged

sre-bot merged 5 commits intopingcap:masterfrom lzmhhh123:bug-fix/stats_for_union_scan

Dec 19, 2019

+56,009

Commits on Dec 17, 2019

Commits on Dec 18, 2019

Commits on Dec 19, 2019

Merge branch 'master' into bug-fix/stats_for_union_scan
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