*: Add split index region syntax support. (#297) (#360)

ast/dml.go

@@ -27,6 +27,7 @@ var (
 	_ DMLNode = &SelectStmt{}
 	_ DMLNode = &ShowStmt{}
 	_ DMLNode = &LoadDataStmt{}
+	_ DMLNode = &SplitIndexRegionStmt{}
 
 	_ Node = &Assignment{}
 	_ Node = &ByItem{}
@@ -1212,3 +1213,35 @@ func (n *FrameBound) Accept(v Visitor) (Node, bool) {
 	}
 	return v.Leave(n)
 }
+
+type SplitIndexRegionStmt struct {
+	dmlNode
+
+	Table      *TableName
+	IndexName  string
+	ValueLists [][]ExprNode
+}
+
+func (n *SplitIndexRegionStmt) Accept(v Visitor) (Node, bool) {
+	newNode, skipChildren := v.Enter(n)
+	if skipChildren {
+		return v.Leave(newNode)
+	}
+
+	n = newNode.(*SplitIndexRegionStmt)
+	node, ok := n.Table.Accept(v)
+	if !ok {
+		return n, false
+	}
+	n.Table = node.(*TableName)
+	for i, list := range n.ValueLists {
+		for j, val := range list {
+			node, ok := val.Accept(v)
+			if !ok {
+				return n, false
+			}
+			n.ValueLists[i][j] = node.(ExprNode)
+		}
+	}
+	return v.Leave(n)
+}

misc.go

@@ -444,6 +444,7 @@ var tokenMap = map[string]int{
 	"SMALLINT":                 smallIntType,
 	"SNAPSHOT":                 snapshot,
 	"SOME":                     some,
+	"SPLIT":                    split,
 	"SQL":                      sql,
 	"SQL_CACHE":                sqlCache,
 	"SQL_CALC_FOUND_ROWS":      sqlCalcFoundRows,

model/model.go

@@ -332,6 +332,16 @@ func (t *TableInfo) Cols() []*ColumnInfo {
 	return publicColumns[0 : maxOffset+1]
 }
 
+// FindIndexByName finds index by name.
+func (t *TableInfo) FindIndexByName(idxName string) *IndexInfo {
+	for _, idx := range t.Indices {
+		if idx.Name.L == idxName {
+			return idx
+		}
+	}
+	return nil
+}
+
 // NewExtraHandleColInfo mocks a column info for extra handle column.
 func NewExtraHandleColInfo() *ColumnInfo {
 	colInfo := &ColumnInfo{