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executor, infoschema: fix display of on update CURRENT_TIMESTAMP with…
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… decimal (#11480)
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@tangenta
tangenta committed Nov 6, 2019
1 parent 34a559d commit f5f79fa
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Showing 11 changed files with 120 additions and 43 deletions.
20 changes: 10 additions & 10 deletions cmd/explaintest/r/topn_push_down.result
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ CREATE TABLE `tr` (
`domain_type` tinyint(4) NOT NULL,
`business_type` tinyint(4) NOT NULL,
`trade_type` tinyint(4) NOT NULL DEFAULT '1',
`trade_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`trade_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`trade_status` tinyint(4) NOT NULL DEFAULT '0',
`trade_pay_status` tinyint(4) NOT NULL DEFAULT '0',
`delivery_type` tinyint(4) NOT NULL DEFAULT '0',
Expand All @@ -24,10 +24,10 @@ CREATE TABLE `tr` (
`device_identy` varchar(36) NOT NULL,
`uuid` varchar(32) NOT NULL,
`status_flag` tinyint(4) NOT NULL,
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`client_update_time` timestamp(3) NULL DEFAULT NULL,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
`creator_id` bigint(20) DEFAULT NULL,
`creator_name` varchar(32) DEFAULT NULL,
`updator_id` bigint(20) DEFAULT NULL,
Expand Down Expand Up @@ -66,10 +66,10 @@ CREATE TABLE `p` (
`device_identy` varchar(36) NOT NULL,
`uuid` varchar(32) NOT NULL,
`status_flag` tinyint(4) NOT NULL DEFAULT '1',
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`client_update_time` timestamp(3) NULL DEFAULT NULL,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
`creator_id` bigint(20) DEFAULT NULL,
`creator_name` varchar(32) DEFAULT NULL,
`updator_id` bigint(20) DEFAULT NULL,
Expand Down Expand Up @@ -117,10 +117,10 @@ CREATE TABLE `te` (
`device_identy` varchar(36) NOT NULL,
`uuid` varchar(32) NOT NULL,
`status_flag` tinyint(4) NOT NULL,
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`client_update_time` timestamp(3) NULL DEFAULT NULL,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
`creator_id` bigint(20) DEFAULT NULL,
`creator_name` varchar(32) DEFAULT NULL,
`updator_id` bigint(20) DEFAULT NULL,
Expand Down
20 changes: 10 additions & 10 deletions cmd/explaintest/t/topn_push_down.test
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ CREATE TABLE `tr` (
`domain_type` tinyint(4) NOT NULL,
`business_type` tinyint(4) NOT NULL,
`trade_type` tinyint(4) NOT NULL DEFAULT '1',
`trade_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`trade_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`trade_status` tinyint(4) NOT NULL DEFAULT '0',
`trade_pay_status` tinyint(4) NOT NULL DEFAULT '0',
`delivery_type` tinyint(4) NOT NULL DEFAULT '0',
Expand All @@ -24,10 +24,10 @@ CREATE TABLE `tr` (
`device_identy` varchar(36) NOT NULL,
`uuid` varchar(32) NOT NULL,
`status_flag` tinyint(4) NOT NULL,
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`client_update_time` timestamp(3) NULL DEFAULT NULL,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
`creator_id` bigint(20) DEFAULT NULL,
`creator_name` varchar(32) DEFAULT NULL,
`updator_id` bigint(20) DEFAULT NULL,
Expand Down Expand Up @@ -68,10 +68,10 @@ CREATE TABLE `p` (
`device_identy` varchar(36) NOT NULL,
`uuid` varchar(32) NOT NULL,
`status_flag` tinyint(4) NOT NULL DEFAULT '1',
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`client_update_time` timestamp(3) NULL DEFAULT NULL,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
`creator_id` bigint(20) DEFAULT NULL,
`creator_name` varchar(32) DEFAULT NULL,
`updator_id` bigint(20) DEFAULT NULL,
Expand Down Expand Up @@ -121,10 +121,10 @@ CREATE TABLE `te` (
`device_identy` varchar(36) NOT NULL,
`uuid` varchar(32) NOT NULL,
`status_flag` tinyint(4) NOT NULL,
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`client_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`client_update_time` timestamp(3) NULL DEFAULT NULL,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`server_create_time` timestamp(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`server_update_time` timestamp(3) DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
`creator_id` bigint(20) DEFAULT NULL,
`creator_name` varchar(32) DEFAULT NULL,
`updator_id` bigint(20) DEFAULT NULL,
Expand Down
15 changes: 15 additions & 0 deletions ddl/db_integration_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -924,6 +924,21 @@ func (s *testIntegrationSuite) TestDropAutoIncrement(c *C) {
tk.MustExec("set @@tidb_allow_remove_auto_inc = off")
}

func (s *testIntegrationSuite) TestInvalidDefaultOrOnUpdateClause(c *C) {
tk := testkit.NewTestKit(c, s.store)
tk.MustExec("create database if not exists test")
tk.MustExec("use test")

sql := "create table t2 (a datetime(2) default current_timestamp(3))"
assertErrorCode(c, tk, sql, mysql.ErrInvalidDefault)
sql = "create table t2 (a datetime(2) default current_timestamp(2) on update current_timestamp)"
assertErrorCode(c, tk, sql, mysql.ErrInvalidOnUpdate)
sql = "create table t2 (a datetime default current_timestamp on update current_timestamp(2))"
assertErrorCode(c, tk, sql, mysql.ErrInvalidOnUpdate)
sql = "create table t2 (a datetime(2) default current_timestamp(2) on update current_timestamp(3))"
assertErrorCode(c, tk, sql, mysql.ErrInvalidOnUpdate)
}

func (s *testIntegrationSuite) TestBitDefaultValue(c *C) {
tk := testkit.NewTestKit(c, s.store)
tk.MustExec("create database if not exists test")
Expand Down
3 changes: 3 additions & 0 deletions ddl/ddl.go
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Original file line number Diff line number Diff line change
Expand Up @@ -130,6 +130,8 @@ var (
errBlobCantHaveDefault = terror.ClassDDL.New(codeBlobCantHaveDefault, mysql.MySQLErrName[mysql.ErrBlobCantHaveDefault])
errTooLongIndexComment = terror.ClassDDL.New(codeErrTooLongIndexComment, mysql.MySQLErrName[mysql.ErrTooLongIndexComment])

// ErrInvalidDefaultValue returns for invalid default value for columns.
ErrInvalidDefaultValue = terror.ClassDDL.New(codeInvalidDefaultValue, mysql.MySQLErrName[mysql.ErrInvalidDefault])
// ErrDupKeyName returns for duplicated key name
ErrDupKeyName = terror.ClassDDL.New(codeDupKeyName, "duplicate key name")
// ErrInvalidDBState returns for invalid database state.
Expand Down Expand Up @@ -679,6 +681,7 @@ func init() {
codeFileNotFound: mysql.ErrFileNotFound,
codeErrorOnRename: mysql.ErrErrorOnRename,
codeBadField: mysql.ErrBadField,
codeInvalidDefaultValue: mysql.ErrInvalidDefault,
codeInvalidUseOfNull: mysql.ErrInvalidUseOfNull,
codeUnsupportedOnGeneratedColumn: mysql.ErrUnsupportedOnGeneratedColumn,
codeGeneratedColumnNonPrior: mysql.ErrGeneratedColumnNonPrior,
Expand Down
12 changes: 10 additions & 2 deletions ddl/ddl_api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -510,6 +510,14 @@ func columnDefToCol(ctx sessionctx.Context, offset int, colDef *ast.ColumnDef, o
col.Flag |= mysql.UniqueKeyFlag
}
case ast.ColumnOptionDefaultValue:
if col.Tp == mysql.TypeTimestamp || col.Tp == mysql.TypeDatetime {
switch x := v.Expr.(type) {
case *ast.FuncCallExpr:
if x.FnName.L == ast.CurrentTimestamp && !expression.IsValidCurrentTimestampExpr(v.Expr, colDef.Tp) {
return nil, nil, ErrInvalidDefaultValue.GenWithStackByArgs(col.Name)
}
}
}
hasDefaultValue, err = setDefaultValue(ctx, col, v)
if err != nil {
return nil, nil, errors.Trace(err)
Expand All @@ -518,7 +526,7 @@ func columnDefToCol(ctx sessionctx.Context, offset int, colDef *ast.ColumnDef, o
case ast.ColumnOptionOnUpdate:
// TODO: Support other time functions.
if col.Tp == mysql.TypeTimestamp || col.Tp == mysql.TypeDatetime {
if !expression.IsCurrentTimestampExpr(v.Expr) {
if !expression.IsValidCurrentTimestampExpr(v.Expr, colDef.Tp) {
return nil, nil, ErrInvalidOnUpdate.GenWithStackByArgs(col.Name)
}
} else {
Expand Down Expand Up @@ -1968,7 +1976,7 @@ func setDefaultAndComment(ctx sessionctx.Context, col *table.Column, options []*
case ast.ColumnOptionOnUpdate:
// TODO: Support other time functions.
if col.Tp == mysql.TypeTimestamp || col.Tp == mysql.TypeDatetime {
if !expression.IsCurrentTimestampExpr(opt.Expr) {
if !expression.IsValidCurrentTimestampExpr(opt.Expr, &col.FieldType) {
return ErrInvalidOnUpdate.GenWithStackByArgs(col.Name)
}
} else {
Expand Down
1 change: 1 addition & 0 deletions executor/show.go
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Original file line number Diff line number Diff line change
Expand Up @@ -593,6 +593,7 @@ func (e *ShowExec) fetchShowCreateTable() error {
}
if mysql.HasOnUpdateNowFlag(col.Flag) {
buf.WriteString(" ON UPDATE CURRENT_TIMESTAMP")
buf.WriteString(table.OptionalFsp(&col.FieldType))
}
}
if len(col.Comment) > 0 {
Expand Down
10 changes: 8 additions & 2 deletions executor/show_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -574,6 +574,7 @@ func (s *testSuite) TestShow2(c *C) {
c_timestamp timestamp,
c_timestamp_default timestamp default current_timestamp,
c_timestamp_default_3 timestamp(3) default current_timestamp(3),
c_timestamp_default_4 timestamp(3) default current_timestamp(3) on update current_timestamp(3),
c_blob blob,
c_tinyblob tinyblob,
c_mediumblob mediumblob,
Expand Down Expand Up @@ -609,6 +610,7 @@ func (s *testSuite) TestShow2(c *C) {
"[c_timestamp timestamp <nil> YES <nil> select,insert,update,references ]\n" +
"[c_timestamp_default timestamp <nil> YES CURRENT_TIMESTAMP select,insert,update,references ]\n" +
"[c_timestamp_default_3 timestamp(3) <nil> YES CURRENT_TIMESTAMP(3) select,insert,update,references ]\n" +
"[c_timestamp_default_4 timestamp(3) <nil> YES CURRENT_TIMESTAMP(3) DEFAULT_GENERATED on update CURRENT_TIMESTAMP(3) select,insert,update,references ]\n" +
"[c_blob blob <nil> YES <nil> select,insert,update,references ]\n" +
"[c_tinyblob tinyblob <nil> YES <nil> select,insert,update,references ]\n" +
"[c_mediumblob mediumblob <nil> YES <nil> select,insert,update,references ]\n" +
Expand Down Expand Up @@ -741,15 +743,19 @@ func (s *testSuite) TestShowCreateTable(c *C) {
"`b` timestamp(3) default current_timestamp(3),\n" +
"`c` datetime default current_timestamp,\n" +
"`d` datetime(4) default current_timestamp(4),\n" +
"`e` varchar(20) default 'cUrrent_tImestamp')")
"`e` varchar(20) default 'cUrrent_tImestamp',\n" +
"`f` datetime(2) default current_timestamp(2) on update current_timestamp(2),\n" +
"`g` timestamp(2) default current_timestamp(2) on update current_timestamp(2))")
tk.MustQuery("show create table `t`").Check(testutil.RowsWithSep("|",
""+
"t CREATE TABLE `t` (\n"+
" `a` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,\n"+
" `b` timestamp(3) DEFAULT CURRENT_TIMESTAMP(3),\n"+
" `c` datetime DEFAULT CURRENT_TIMESTAMP,\n"+
" `d` datetime(4) DEFAULT CURRENT_TIMESTAMP(4),\n"+
" `e` varchar(20) DEFAULT 'cUrrent_tImestamp'\n"+
" `e` varchar(20) DEFAULT 'cUrrent_tImestamp',\n"+
" `f` datetime(2) DEFAULT CURRENT_TIMESTAMP(2) ON UPDATE CURRENT_TIMESTAMP(2),\n"+
" `g` timestamp(2) DEFAULT CURRENT_TIMESTAMP(2) ON UPDATE CURRENT_TIMESTAMP(2)\n"+
") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin",
))
tk.MustExec("drop table t")
Expand Down
22 changes: 17 additions & 5 deletions expression/helper.go
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Original file line number Diff line number Diff line change
Expand Up @@ -35,12 +35,24 @@ func boolToInt64(v bool) int64 {
return 0
}

// IsCurrentTimestampExpr returns whether e is CurrentTimestamp expression.
func IsCurrentTimestampExpr(e ast.ExprNode) bool {
if fn, ok := e.(*ast.FuncCallExpr); ok && fn.FnName.L == ast.CurrentTimestamp {
return true
// IsValidCurrentTimestampExpr returns true if exprNode is a valid CurrentTimestamp expression.
// Here `valid` means it is consistent with the given fieldType's Decimal.
func IsValidCurrentTimestampExpr(exprNode ast.ExprNode, fieldType *types.FieldType) bool {
fn, isFuncCall := exprNode.(*ast.FuncCallExpr)
if !isFuncCall || fn.FnName.L != ast.CurrentTimestamp {
return false
}
return false

containsArg := len(fn.Args) > 0
// Fsp represents fractional seconds precision.
containsFsp := fieldType != nil && fieldType.Decimal > 0
var isConsistent bool
if containsArg {
v, ok := fn.Args[0].(*driver.ValueExpr)
isConsistent = ok && fieldType != nil && v.Datum.GetInt64() == int64(fieldType.Decimal)
}

return (containsArg && isConsistent) || (!containsArg && !containsFsp)
}

// GetTimeValue gets the time value with type tp.
Expand Down
24 changes: 21 additions & 3 deletions expression/helper_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@ import (
"github.com/pingcap/parser/mysql"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/types"
driver "github.com/pingcap/tidb/types/parser_driver"
"github.com/pingcap/tidb/util/mock"
"github.com/pingcap/tidb/util/testleak"
)
Expand Down Expand Up @@ -108,11 +109,28 @@ func (s *testExpressionSuite) TestGetTimeValue(c *C) {

func (s *testExpressionSuite) TestIsCurrentTimestampExpr(c *C) {
defer testleak.AfterTest(c)()
v := IsCurrentTimestampExpr(ast.NewValueExpr("abc"))
c.Assert(v, IsFalse)
buildTimestampFuncCallExpr := func(i int64) *ast.FuncCallExpr {
var args []ast.ExprNode
if i != 0 {
args = []ast.ExprNode{&driver.ValueExpr{Datum: types.NewIntDatum(i)}}
}
return &ast.FuncCallExpr{FnName: model.NewCIStr("CURRENT_TIMESTAMP"), Args: args}
}

v = IsCurrentTimestampExpr(&ast.FuncCallExpr{FnName: model.NewCIStr("CURRENT_TIMESTAMP")})
v := IsValidCurrentTimestampExpr(ast.NewValueExpr("abc"), nil)
c.Assert(v, IsFalse)
v = IsValidCurrentTimestampExpr(buildTimestampFuncCallExpr(0), nil)
c.Assert(v, IsTrue)
v = IsValidCurrentTimestampExpr(buildTimestampFuncCallExpr(3), &types.FieldType{Decimal: 3})
c.Assert(v, IsTrue)
v = IsValidCurrentTimestampExpr(buildTimestampFuncCallExpr(1), &types.FieldType{Decimal: 3})
c.Assert(v, IsFalse)
v = IsValidCurrentTimestampExpr(buildTimestampFuncCallExpr(0), &types.FieldType{Decimal: 3})
c.Assert(v, IsFalse)
v = IsValidCurrentTimestampExpr(buildTimestampFuncCallExpr(2), &types.FieldType{Decimal: 0})
c.Assert(v, IsFalse)
v = IsValidCurrentTimestampExpr(buildTimestampFuncCallExpr(2), nil)
c.Assert(v, IsFalse)
}

func (s *testExpressionSuite) TestCurrentTimestampTimeZone(c *C) {
Expand Down
24 changes: 14 additions & 10 deletions infoschema/tables_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -285,23 +285,27 @@ func (s *testTableSuite) TestCurrentTimestampAsDefault(c *C) {
c_timestamp_default_3 timestamp(3) default current_timestamp(3),
c_varchar_default varchar(20) default "current_timestamp",
c_varchar_default_3 varchar(20) default "current_timestamp(3)",
c_varchar_default_on_update datetime default current_timestamp on update current_timestamp,
c_varchar_default_on_update_fsp datetime(3) default current_timestamp(3) on update current_timestamp(3),
c_varchar_default_with_case varchar(20) default "cUrrent_tImestamp"
);`)

tk.MustQuery(`SELECT column_name, column_default
tk.MustQuery(`SELECT column_name, column_default, extra
FROM information_schema.COLUMNS
WHERE table_schema = "default_time_test" AND table_name = "default_time_table"
ORDER BY column_name`,
).Check(testkit.Rows(
"c_datetime <nil>",
"c_datetime_default CURRENT_TIMESTAMP",
"c_datetime_default_2 CURRENT_TIMESTAMP(2)",
"c_timestamp <nil>",
"c_timestamp_default CURRENT_TIMESTAMP",
"c_timestamp_default_3 CURRENT_TIMESTAMP(3)",
"c_varchar_default current_timestamp",
"c_varchar_default_3 current_timestamp(3)",
"c_varchar_default_with_case cUrrent_tImestamp",
"c_datetime <nil> ",
"c_datetime_default CURRENT_TIMESTAMP ",
"c_datetime_default_2 CURRENT_TIMESTAMP(2) ",
"c_timestamp <nil> ",
"c_timestamp_default CURRENT_TIMESTAMP ",
"c_timestamp_default_3 CURRENT_TIMESTAMP(3) ",
"c_varchar_default current_timestamp ",
"c_varchar_default_3 current_timestamp(3) ",
"c_varchar_default_on_update CURRENT_TIMESTAMP DEFAULT_GENERATED on update CURRENT_TIMESTAMP",
"c_varchar_default_on_update_fsp CURRENT_TIMESTAMP(3) DEFAULT_GENERATED on update CURRENT_TIMESTAMP(3)",
"c_varchar_default_with_case cUrrent_tImestamp ",
))
tk.MustExec("DROP DATABASE default_time_test")
}
Expand Down
12 changes: 11 additions & 1 deletion table/column.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ package table
import (
"context"
"fmt"
"strconv"
"strings"
"time"
"unicode/utf8"
Expand Down Expand Up @@ -272,7 +273,7 @@ func NewColDesc(col *Column) *ColDesc {
} else if mysql.HasOnUpdateNowFlag(col.Flag) {
//in order to match the rules of mysql 8.0.16 version
//see https://github.com/pingcap/tidb/issues/10337
extra = "DEFAULT_GENERATED on update CURRENT_TIMESTAMP"
extra = "DEFAULT_GENERATED on update CURRENT_TIMESTAMP" + OptionalFsp(&col.FieldType)
} else if col.IsGenerated() {
if col.GeneratedStored {
extra = "STORED GENERATED"
Expand Down Expand Up @@ -500,3 +501,12 @@ func GetZeroValue(col *model.ColumnInfo) types.Datum {
}
return d
}

// OptionalFsp convert a FieldType.Decimal to string.
func OptionalFsp(fieldType *types.FieldType) string {
fsp := fieldType.Decimal
if fsp == 0 {
return ""
}
return "(" + strconv.Itoa(fsp) + ")"
}

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