parser: support admin flush plan_cache

parser/ast/misc.go

@@ -1856,6 +1856,7 @@ const (
 	AdminShowTelemetry
 	AdminResetTelemetryID
 	AdminReloadStatistics
+	AdminFlushPlanCache
 )
 
 // HandleRange represents a range where handle value >= Begin and < End.
@@ -1864,6 +1865,15 @@ type HandleRange struct {
 	End   int64
 }
 
+type StatementScope int
+
+const (
+	StatementScopeNone StatementScope = iota
+	StatementScopeSession
+	StatementScopeInstance
+	StatementScopeGlobal
+)
+
 // ShowSlowType defines the type for SlowSlow statement.
 type ShowSlowType int
 
@@ -1929,10 +1939,11 @@ type AdminStmt struct {
 	JobIDs    []int64
 	JobNumber int64
 
-	HandleRanges []HandleRange
-	ShowSlow     *ShowSlow
-	Plugins      []string
-	Where        ExprNode
+	HandleRanges   []HandleRange
+	ShowSlow       *ShowSlow
+	Plugins        []string
+	Where          ExprNode
+	StatementScope StatementScope
 }
 
 // Restore implements Node interface.
@@ -2070,6 +2081,14 @@ func (n *AdminStmt) Restore(ctx *format.RestoreCtx) error {
 		ctx.WriteKeyWord("RESET TELEMETRY_ID")
 	case AdminReloadStatistics:
 		ctx.WriteKeyWord("RELOAD STATS_EXTENDED")
+	case AdminFlushPlanCache:
+		if n.StatementScope == StatementScopeSession {
+			ctx.WriteKeyWord("FLUSH SESSION PLAN_CACHE")
+		} else if n.StatementScope == StatementScopeInstance {
+			ctx.WriteKeyWord("FLUSH INSTANCE PLAN_CACHE")
+		} else if n.StatementScope == StatementScopeGlobal {
+			ctx.WriteKeyWord("FLUSH GLOBAL PLAN_CACHE")
+		}
 	default:
 		return errors.New("Unsupported AdminStmt type")
 	}

parser/misc.go

@@ -532,6 +532,7 @@ var tokenMap = map[string]int{
 	"PESSIMISTIC":              pessimistic,
 	"PLACEMENT":                placement,
 	"PLAN":                     plan,
+	"PLAN_CACHE":               planCache,
 	"PLUGINS":                  plugins,
 	"POLICY":                   policy,
 	"POSITION":                 position,