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planner: disable projection elimination for select plan of update (#1…
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eurekaka authored Jul 15, 2019
1 parent d420a1f commit 3f1d234
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Showing 2 changed files with 18 additions and 1 deletion.
15 changes: 15 additions & 0 deletions planner/core/cbo_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -1090,3 +1090,18 @@ func (s *testAnalyzeSuite) TestLimitCrossEstimation(c *C) {
" └─TableScan_19 6.00 cop table:t, keep order:false",
))
}

func (s *testAnalyzeSuite) TestUpdateProjEliminate(c *C) {
store, dom, err := newStoreWithBootstrap()
c.Assert(err, IsNil)
tk := testkit.NewTestKit(c, store)
defer func() {
dom.Close()
store.Close()
}()

tk.MustExec("use test")
tk.MustExec("drop table if exists t")
tk.MustExec("create table t(a int, b int)")
tk.MustExec("explain update t t1, (select distinct b from t) t2 set t1.b = t2.b")
}
4 changes: 3 additions & 1 deletion planner/core/logical_plan_builder.go
Original file line number Diff line number Diff line change
Expand Up @@ -2576,7 +2576,9 @@ func (b *PlanBuilder) buildUpdate(update *ast.UpdateStmt) (Plan, error) {

updt := Update{OrderedList: orderedList}.Init(b.ctx)
updt.SetSchema(p.Schema())
updt.SelectPlan, err = DoOptimize(b.optFlag, p)
// We cannot apply projection elimination when building the subplan, because
// columns in orderedList cannot be resolved.
updt.SelectPlan, err = DoOptimize(b.optFlag&^flagEliminateProjection, p)
if err != nil {
return nil, err
}
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