planner: display cop tasks when explain format is "dot" (#12225) #16125
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cherry-pick #12225 to release-3.1
What problem does this PR solve?
(1) In the physical plan tree, if the top node is a
TableReader/IndexLookUpReader/IndexReader, it will not display the cop processes when executingexplain format="dot".(2) Some uses of
fmt.Sprintfare not the best way.What is changed and how it works?
Check List
Tests
(1)
create table t(a int, b int, c int);(2)
explain format="dot" select * from t where a < 2;Code changes
planner/core/common_plan.go prepareTaskDot()