planner: let the planner can select IndexMerge on MVIndex without hint#40347

Merged

ti-chi-bot merged 6 commits intopingcap:masterfrom qw4990:mvindex-selection

Jan 6, 2023

+210-58

Commits on Jan 5, 2023

Commits on Jan 6, 2023

Merge branch 'master' into mvindex-selection
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