parser: more meaningful words for placement rules

follow pingcap/tidb#18030 (comment). However, "constraints" is used for "label". Because it is not necessarily related to region/locality.
pingcap · Jul 21, 2020 · 34aea1b · 34aea1b
1 parent 3dd0dd2
commit 34aea1b
Show file tree

Hide file tree

Showing 5 changed files with 7,886 additions and 7,877 deletions.
diff --git a/ast/ddl.go b/ast/ddl.go
@@ -3468,23 +3468,23 @@ const (
 type PlacementSpec struct {
 	node
 
-	Tp     PlacementActionType
-	Labels string
-	Role   PlacementRole
-	Count  uint64
+	Tp          PlacementActionType
+	Constraints string
+	Role        PlacementRole
+	Replicas    uint64
 }
 
 func (n *PlacementSpec) Restore(ctx *format.RestoreCtx) error {
 	switch n.Tp {
 	case PlacementAdd:
-		ctx.WriteKeyWord("ADD PLACEMENT ")
+		ctx.WriteKeyWord("ADD PLACEMENT POLICY ")
 	default:
 		return errors.Errorf("invalid PlacementActionType: %d", n.Tp)
 	}
 
-	ctx.WriteKeyWord("LABEL")
+	ctx.WriteKeyWord("CONSTRAINTS")
 	ctx.WritePlain("=")
-	ctx.WriteString(n.Labels)
+	ctx.WriteString(n.Constraints)
 
 	ctx.WriteKeyWord(" ROLE")
 	ctx.WritePlain("=")
@@ -3501,8 +3501,8 @@ func (n *PlacementSpec) Restore(ctx *format.RestoreCtx) error {
 		return errors.Errorf("invalid PlacementRole: %d", n.Role)
 	}
 
-	ctx.WriteKeyWord(" COUNT")
-	ctx.WritePlainf("=%d", n.Count)
+	ctx.WriteKeyWord(" REPLICAS")
+	ctx.WritePlainf("=%d", n.Replicas)
 	return nil
 }
 

diff --git a/misc.go b/misc.go
@@ -228,10 +228,10 @@ var tokenMap = map[string]int{
 	"CONNECTION":               connection,
 	"CONSISTENT":               consistent,
 	"CONSTRAINT":               constraint,
+	"CONSTRAINTS":              constraints,
 	"CONTEXT":                  context,
 	"CONVERT":                  convert,
 	"COPY":                     copyKwd,
-	"COUNT":                    count,
 	"APPROX_COUNT_DISTINCT":    approxCountDistinct,
 	"CPU":                      cpu,
 	"CREATE":                   create,
@@ -397,7 +397,6 @@ var tokenMap = map[string]int{
 	"KEY":                      key,
 	"KEYS":                     keys,
 	"KILL":                     kill,
-	"LABEL":                    label,
 	"LABELS":                   labels,
 	"LANGUAGE":                 language,
 	"LAST_BACKUP":              lastBackup,
@@ -506,6 +505,7 @@ var tokenMap = map[string]int{
 	"PESSIMISTIC":              pessimistic,
 	"PLACEMENT":                placement,
 	"PLUGINS":                  plugins,
+	"POLICY":                   policy,
 	"POSITION":                 position,
 	"PRE_SPLIT_REGIONS":        preSplitRegions,
 	"PRECEDING":                preceding,
@@ -545,6 +545,7 @@ var tokenMap = map[string]int{
 	"REPEATABLE":               repeatable,
 	"REPLACE":                  replace,
 	"REPLICA":                  replica,
+	"REPLICAS":                 replicas,
 	"REPLICATION":              replication,
 	"REQUIRE":                  require,
 	"RESET":                    reset,