distsql: let analyze use RC level and low priority (pingcap#7496)

distsql/request_builder.go

@@ -89,6 +89,8 @@ func (builder *RequestBuilder) SetAnalyzeRequest(ana *tipb.AnalyzeReq) *RequestB
 	builder.Request.StartTs = ana.StartTs
 	builder.Request.Data, builder.err = ana.Marshal()
 	builder.Request.NotFillCache = true
+	builder.Request.IsolationLevel = kv.RC
+	builder.Request.Priority = kv.PriorityLow
 	return builder
 }
 

distsql/request_builder_test.go

@@ -496,7 +496,7 @@ func (s *testSuite) TestRequestBuilder5(c *C) {
 	actual, err := (&RequestBuilder{}).SetKeyRanges(keyRanges).
 		SetAnalyzeRequest(&tipb.AnalyzeReq{}).
 		SetKeepOrder(true).
-		SetPriority(kv.PriorityLow).
+		SetConcurrency(15).
 		Build()
 	c.Assert(err, IsNil)
 	expect := &kv.Request{
@@ -506,8 +506,8 @@ func (s *testSuite) TestRequestBuilder5(c *C) {
 		KeyRanges:      keyRanges,
 		KeepOrder:      true,
 		Desc:           false,
-		Concurrency:    0,
-		IsolationLevel: kv.SI,
+		Concurrency:    15,
+		IsolationLevel: kv.RC,
 		Priority:       1,
 		NotFillCache:   true,
 		SyncLog:        false,

executor/analyze.go

@@ -197,9 +197,8 @@ func (e *AnalyzeIndexExec) open() error {
 	kvReq, err := builder.SetIndexRanges(e.ctx.GetSessionVars().StmtCtx, e.tblInfo.ID, e.idxInfo.ID, ranger.FullNewRange()).
 		SetAnalyzeRequest(e.analyzePB).
 		SetKeepOrder(true).
-		SetPriority(e.priority).
+		SetConcurrency(e.concurrency).
 		Build()
-	kvReq.Concurrency = e.concurrency
 	ctx := context.TODO()
 	e.result, err = distsql.Analyze(ctx, e.ctx.GetClient(), kvReq)
 	if err != nil {
@@ -313,9 +312,8 @@ func (e *AnalyzeColumnsExec) buildResp(ranges []*ranger.NewRange) (distsql.Selec
 	kvReq, err := builder.SetTableRanges(e.tblInfo.ID, ranges, nil).
 		SetAnalyzeRequest(e.analyzePB).
 		SetKeepOrder(e.keepOrder).
-		SetPriority(e.priority).
+		SetConcurrency(e.concurrency).
 		Build()
-	kvReq.Concurrency = e.concurrency
 	if err != nil {
 		return nil, errors.Trace(err)
 	}