executor: support table partition in show create table stmt

executor/show.go

@@ -614,6 +614,24 @@ func (e *ShowExec) fetchShowCreateTable() error {
 		buf.WriteString(fmt.Sprintf(" DEFAULT CHARSET=%s COLLATE=%s", charsetName, collate))
 	}
 
+	// add partition info here.
+	partitionInfo := tb.Meta().Partition
+	if partitionInfo != nil {
+		buf.WriteString(fmt.Sprintf("\nPARTITION BY %s ( %s ) (\n", partitionInfo.Type.String(), partitionInfo.Expr))
+		for i, def := range partitionInfo.Definitions {
+			if i < len(partitionInfo.Definitions)-1 {
+				buf.WriteString(fmt.Sprintf("  PARTITION %s VALUES LESS THAN %s,\n", def.Name, def.LessThan[0]))
+			} else {
+				if def.MaxValue {
+					buf.WriteString(fmt.Sprintf("  PARTITION %s VALUES LESS THAN %s\n", def.Name, "MAXVALUE"))
+				} else {
+					buf.WriteString(fmt.Sprintf("  PARTITION %s VALUES LESS THAN %s\n", def.Name, def.LessThan[0]))
+				}
+			}
+		}
+		buf.WriteString(")")
+	}
+
 	if hasAutoIncID {
 		autoIncID, err := tb.Allocator(e.ctx).NextGlobalAutoID(tb.Meta().ID)
 		if err != nil {

executor/show_test.go

@@ -312,7 +312,17 @@ func (s *testSuite) TestShow(c *C) {
 			") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin",
 	))
 
+	// Test range partition
 	tk.MustExec(`drop table if exists t`)
+	tk.MustExec(`CREATE TABLE t (a int) PARTITION BY RANGE(a) (
+ 	PARTITION p0 VALUES LESS THAN (10),
+ 	PARTITION p1 VALUES LESS THAN (20),
+ 	PARTITION p2 VALUES LESS THAN (MAXVALUE))`)
+	tk.MustQuery("show create table t").Check(testutil.RowsWithSep("|",
+		"t CREATE TABLE `t` (\n"+
+			"  `a` int(11) DEFAULT NULL\n"+
+			") ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin"+"\nPARTITION BY RANGE ( `a` ) (\n  PARTITION p0 VALUES LESS THAN 10,\n  PARTITION p1 VALUES LESS THAN 20,\n  PARTITION p2 VALUES LESS THAN MAXVALUE\n)",
+	))
 }
 
 func (s *testSuite) TestShowVisibility(c *C) {

model/model.go

@@ -233,6 +233,20 @@ const (
 	PartitionTypeList  PartitionType = 3
 )
 
+func (p PartitionType) String() string {
+	switch p {
+	case PartitionTypeRange:
+		return "RANGE"
+	case PartitionTypeHash:
+		return "HASH"
+	case PartitionTypeList:
+		return "LIST"
+	default:
+		return ""
+	}
+
+}
+
 // PartitionInfo provides table partition info.
 type PartitionInfo struct {
 	Type    PartitionType