*: fix 'Duplicate entry' error when @@auto_increment_increment and @@…

…auto_increment_offset is set (#52626)

close #52622

pkg/autoid_service/autoid.go

@@ -200,7 +200,7 @@ func (alloc *autoIDValue) rebase4Unsigned(ctx context.Context,
 		return nil
 	}
 	// Satisfied by alloc.end, need to update alloc.base.
-	if requiredBase <= uint64(alloc.end) {
+	if requiredBase > uint64(alloc.base) && requiredBase <= uint64(alloc.end) {
 		alloc.base = int64(requiredBase)
 		return nil
 	}
@@ -243,7 +243,7 @@ func (alloc *autoIDValue) rebase4Signed(ctx context.Context, store kv.Storage, d
 		return nil
 	}
 	// Satisfied by alloc.end, need to update alloc.base.
-	if requiredBase <= alloc.end {
+	if requiredBase > alloc.base && requiredBase <= alloc.end {
 		alloc.base = requiredBase
 		return nil
 	}
@@ -501,6 +501,7 @@ func (s *Service) allocAutoID(ctx context.Context, req *autoid.AutoIDRequest) (*
 			if err1 != nil {
 				return err1
 			}
+			val.base = currentEnd
 			val.end = currentEnd
 			return nil
 		})

pkg/executor/test/autoidtest/BUILD.bazel

@@ -9,7 +9,7 @@ go_test(
     ],
     flaky = True,
     race = "on",
-    shard_count = 4,
+    shard_count = 5,
     deps = [
         "//pkg/autoid_service",
         "//pkg/config",

pkg/executor/test/autoidtest/autoid_test.go

@@ -567,3 +567,43 @@ func TestIssue39528(t *testing.T) {
 	// Make sure the code does not visit tikv on allocate path.
 	require.False(t, codeRun)
 }
+
+func TestIssue52622(t *testing.T) {
+	store := testkit.CreateMockStore(t)
+
+	tk := testkit.NewTestKit(t, store)
+	tk.MustExec("use test")
+	tk.MustExec(`set @@auto_increment_increment = 66;`)
+	tk.MustExec(`set @@auto_increment_offset = 9527;`)
+
+	tk.MustQuery(`select @@auto_increment_increment;`).Check(testkit.Rows("66"))
+	tk.MustQuery(`select @@auto_increment_offset;`).Check(testkit.Rows("9527"))
+
+	for i := 0; i < 2; i++ {
+		createTableSQL := "create table issue52622 (id int primary key auto_increment, k int)"
+		if i == 0 {
+			createTableSQL = createTableSQL + " AUTO_ID_CACHE 1"
+		}
+
+		tk.MustExec(createTableSQL)
+		tk.MustExec("insert into issue52622 (k) values (1),(2),(3);")
+		tk.MustQuery("select * from issue52622").Check(testkit.Rows("1 1", "67 2", "133 3"))
+		if i == 0 {
+			tk.MustQuery("show create table issue52622").CheckContain("134")
+		}
+		tk.MustExec("insert into issue52622 (k) values (4);")
+		tk.MustQuery("select * from issue52622").Check(testkit.Rows("1 1", "67 2", "133 3", "199 4"))
+
+		tk.MustExec("truncate table issue52622;")
+		tk.MustExec("insert into issue52622 (k) values (1)")
+		tk.MustExec("insert into issue52622 (k) values (2)")
+		tk.MustExec("insert into issue52622 (k) values (3)")
+		if i == 0 {
+			tk.MustQuery("show create table issue52622").CheckContain("134")
+		}
+		tk.MustExec("insert into issue52622 (k) values (4);")
+		tk.MustQuery("select * from issue52622").Check(testkit.Rows("1 1", "67 2", "133 3", "199 4"))
+
+		tk.MustExec("drop table issue52622;")
+	}
+}

pkg/table/table.go

@@ -28,6 +28,7 @@ import (
 	"github.com/pingcap/tidb/pkg/meta/autoid"
 	"github.com/pingcap/tidb/pkg/parser/model"
 	"github.com/pingcap/tidb/pkg/sessionctx"
+	"github.com/pingcap/tidb/pkg/sessionctx/variable"
 	tbctx "github.com/pingcap/tidb/pkg/table/context"
 	"github.com/pingcap/tidb/pkg/types"
 	"github.com/pingcap/tidb/pkg/util/dbterror"
@@ -214,12 +215,23 @@ type Table interface {
 	GetPartitionedTable() PartitionedTable
 }
 
+func getIncrementAndOffset(vars *variable.SessionVars) (int, int) {
+	increment := vars.AutoIncrementIncrement
+	offset := vars.AutoIncrementOffset
+	// When the value of auto_increment_offset is greater than that of auto_increment_increment,
+	// the value of auto_increment_offset is ignored.
+	// Ref https://dev.mysql.com/doc/refman/8.0/en/replication-options-source.html
+	if offset > increment {
+		offset = 1
+	}
+	return increment, offset
+}
+
 // AllocAutoIncrementValue allocates an auto_increment value for a new row.
 func AllocAutoIncrementValue(ctx context.Context, t Table, sctx sessionctx.Context) (int64, error) {
 	r, ctx := tracing.StartRegionEx(ctx, "table.AllocAutoIncrementValue")
 	defer r.End()
-	increment := sctx.GetSessionVars().AutoIncrementIncrement
-	offset := sctx.GetSessionVars().AutoIncrementOffset
+	increment, offset := getIncrementAndOffset(sctx.GetSessionVars())
 	alloc := t.Allocators(sctx.GetTableCtx()).Get(autoid.AutoIncrementType)
 	_, max, err := alloc.Alloc(ctx, uint64(1), int64(increment), int64(offset))
 	if err != nil {
@@ -230,18 +242,17 @@ func AllocAutoIncrementValue(ctx context.Context, t Table, sctx sessionctx.Conte
 
 // AllocBatchAutoIncrementValue allocates batch auto_increment value for rows, returning firstID, increment and err.
 // The caller can derive the autoID by adding increment to firstID for N-1 times.
-func AllocBatchAutoIncrementValue(ctx context.Context, t Table, sctx sessionctx.Context, N int) (firstID int64, increment int64, err error) {
-	increment = int64(sctx.GetSessionVars().AutoIncrementIncrement)
-	offset := int64(sctx.GetSessionVars().AutoIncrementOffset)
+func AllocBatchAutoIncrementValue(ctx context.Context, t Table, sctx sessionctx.Context, N int) ( /* firstID */ int64 /* increment */, int64 /* err */, error) {
+	increment1, offset := getIncrementAndOffset(sctx.GetSessionVars())
 	alloc := t.Allocators(sctx.GetTableCtx()).Get(autoid.AutoIncrementType)
-	min, max, err := alloc.Alloc(ctx, uint64(N), increment, offset)
+	min, max, err := alloc.Alloc(ctx, uint64(N), int64(increment1), int64(offset))
 	if err != nil {
 		return min, max, err
 	}
 	// SeekToFirstAutoIDUnSigned seeks to first autoID. Because AutoIncrement always allocate from 1,
 	// signed and unsigned value can be unified as the unsigned handle.
-	nr := int64(autoid.SeekToFirstAutoIDUnSigned(uint64(min), uint64(increment), uint64(offset)))
-	return nr, increment, nil
+	nr := int64(autoid.SeekToFirstAutoIDUnSigned(uint64(min), uint64(increment1), uint64(offset)))
+	return nr, int64(increment1), nil
 }
 
 // PhysicalTable is an abstraction for two kinds of table representation: partition or non-partitioned table.

tests/integrationtest/r/executor/autoid.result

@@ -575,123 +575,123 @@ create table io (a int key auto_increment);
 insert into io values (null),(null),(null);
 select * from io;
 a
-10
-15
-20
+1
+6
+11
 drop table io;
 create table io (a int key auto_increment) AUTO_ID_CACHE 1;
 insert into io values (null),(null),(null);
 select * from io;
 a
-10
-15
-20
+1
+6
+11
 drop table io;
 create table io (a int key auto_increment);
 set auto_increment_offset = 10;
 set auto_increment_increment = 2;
 insert into io values (),(),();
 select * from io;
 a
-10
-12
-14
+1
+3
+5
 delete from io;
 set auto_increment_increment = 5;
 insert into io values (),(),();
 select * from io;
 a
-15
-20
-25
+6
+11
+16
 delete from io;
 set auto_increment_increment = 10;
 insert into io values (),(),();
 select * from io;
 a
+20
 30
 40
-50
 delete from io;
 set auto_increment_increment = 5;
 insert into io values (),(),();
 select * from io;
 a
-55
-60
-65
+41
+46
+51
 drop table io;
 create table io (a int key auto_increment) AUTO_ID_CACHE 1;
 set auto_increment_offset = 10;
 set auto_increment_increment = 2;
 insert into io values (),(),();
 select * from io;
 a
-10
-12
-14
+1
+3
+5
 delete from io;
 set auto_increment_increment = 5;
 insert into io values (),(),();
 select * from io;
 a
-15
-20
-25
+6
+11
+16
 delete from io;
 set auto_increment_increment = 10;
 insert into io values (),(),();
 select * from io;
 a
+20
 30
 40
-50
 delete from io;
 set auto_increment_increment = 5;
 insert into io values (),(),();
 select * from io;
 a
-55
-60
-65
+41
+46
+51
 drop table io;
 set auto_increment_offset = 10;
 set auto_increment_increment = 2;
 create table io (a int, b int auto_increment, key(b));
 insert into io(b) values (null),(null),(null);
 select b from io;
 b
-10
-12
-14
+1
+3
+5
 select _tidb_rowid from io;
 _tidb_rowid
-15
-16
-17
+6
+7
+8
 delete from io;
 set auto_increment_increment = 10;
 insert into io(b) values (null),(null),(null);
 select b from io;
 b
+10
 20
 30
-40
 select _tidb_rowid from io;
 _tidb_rowid
-41
-42
-43
+31
+32
+33
 drop table io;
 set auto_increment_offset = 10;
 set auto_increment_increment = 2;
 create table io (a int, b int auto_increment, key(b)) AUTO_ID_CACHE 1;
 insert into io(b) values (null),(null),(null);
 select b from io;
 b
-10
-12
-14
+1
+3
+5
 select _tidb_rowid from io;
 _tidb_rowid
 1
@@ -702,9 +702,9 @@ set auto_increment_increment = 10;
 insert into io(b) values (null),(null),(null);
 select b from io;
 b
+10
 20
 30
-40
 select _tidb_rowid from io;
 _tidb_rowid
 4