planner: fix DATA RACE caused by TestCaptureWildcardFilter (#49092) (#…

…49094)

close #49088

pkg/bindinfo/handle.go

@@ -50,7 +50,7 @@ import (
 
 // BindHandle is used to handle all global sql bind operations.
 type BindHandle struct {
-	sctx struct {
+	sctx struct { // TODO: remove this singleton sctx later on, which is not thread-safe.
 		sync.Mutex
 		sessionctx.Context
 	}
@@ -842,6 +842,8 @@ func ParseCaptureTableFilter(tableFilter string) (f tablefilter.Filter, valid bo
 }
 
 func (h *BindHandle) extractCaptureFilterFromStorage() (filter *captureFilter) {
+	h.sctx.Lock()
+	defer h.sctx.Unlock()
 	filter = &captureFilter{
 		frequency: 1,
 		users:     make(map[string]struct{}),