*: add table option: pre_split_regions (pingcap#287)

* *: add table option: pre_split_resions * refine code * add PreSplitRegions in tableInfo * Update misc.go Co-Authored-By: crazycs520 <crazycs520@gmail.com> * Update parser.y Co-Authored-By: crazycs520 <crazycs520@gmail.com> * address comment * refine comment
lyonzhi · Apr 15, 2019 · de4274a · de4274a
1 parent a73b469
commit de4274a
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Showing 5 changed files with 5,256 additions and 5,232 deletions.
diff --git a/ast/ddl.go b/ast/ddl.go
@@ -1180,6 +1180,7 @@ const (
 	TableOptionRowFormat
 	TableOptionStatsPersistent
 	TableOptionShardRowID
+	TableOptionPreSplitRegion
 	TableOptionPackKeys
 )
 
@@ -1324,8 +1325,10 @@ func (n *TableOption) Restore(ctx *RestoreCtx) error {
 		ctx.WritePlain(" /* TableOptionStatsPersistent is not supported */ ")
 	case TableOptionShardRowID:
 		ctx.WriteKeyWord("SHARD_ROW_ID_BITS ")
-		ctx.WritePlain("= ")
-		ctx.WritePlainf("%d", n.UintValue)
+		ctx.WritePlainf("= %d", n.UintValue)
+	case TableOptionPreSplitRegion:
+		ctx.WriteKeyWord("PRE_SPLIT_REGIONS ")
+		ctx.WritePlainf("= %d", n.UintValue)
 	case TableOptionPackKeys:
 		// TODO: not support
 		ctx.WriteKeyWord("PACK_KEYS ")

diff --git a/misc.go b/misc.go
@@ -408,6 +408,7 @@ var tokenMap = map[string]int{
 	"QUERIES":                  queries,
 	"QUICK":                    quick,
 	"SHARD_ROW_ID_BITS":        shardRowIDBits,
+	"PRE_SPLIT_REGIONS":        preSplitRegions,
 	"RANGE":                    rangeKwd,
 	"RECOVER":                  recover,
 	"READ":                     read,

diff --git a/model/model.go b/model/model.go
@@ -214,6 +214,10 @@ type TableInfo struct {
 	ShardRowIDBits uint64
 	// MaxShardRowIDBits uses to record the max ShardRowIDBits be used so far.
 	MaxShardRowIDBits uint64 `json:"max_shard_row_id_bits"`
+	// PreSplitRegions specify the pre-split region when create table.
+	// The pre-split region num is 2^(PreSplitRegions-1).
+	// And the PreSplitRegions should less than or equal to ShardRowIDBits.
+	PreSplitRegions uint64 `json:"pre_split_regions"`
 
 	Partition *PartitionInfo `json:"partition"`