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expression,ddl: fix fraction part handle of current_timestamp #7355

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merged 7 commits into from
Aug 14, 2018
Merged

expression,ddl: fix fraction part handle of current_timestamp #7355

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f1400e9
expression: make current_timestamp follow fsp rule.
lysu Aug 10, 2018
df8a802
ddl,parser: add check current_timestamp(x) args.
lysu Aug 10, 2018
2adb29b
ddl: on update function limit & add testcase for ddl
lysu Aug 10, 2018
11d53d1
test: add testcase for current_timestamp insert/selection
lysu Aug 10, 2018
a7f6bc5
revert: old logic is right.
lysu Aug 10, 2018
1577ef3
revert: fix explain's wrong use.
lysu Aug 10, 2018
cddffd8
address comment, doesn't break backward compatible
lysu Aug 13, 2018
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2 changes: 1 addition & 1 deletion ddl/db_test.go
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Expand Up @@ -1760,7 +1760,7 @@ func (s *testDBSuite) TestTableDDLWithTimeType(c *C) {
s.testErrorCode(c, "alter table t change column a aa time(7)", tmysql.ErrTooBigPrecision)
s.testErrorCode(c, "alter table t change column a aa datetime(7)", tmysql.ErrTooBigPrecision)
s.testErrorCode(c, "alter table t change column a aa timestamp(7)", tmysql.ErrTooBigPrecision)
s.mustExec(c, "alter table t change column a aa timestamp(0)")
s.mustExec(c, "alter table t change column a aa datetime(0)")
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Why this is changed to datetime ?

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@lysu lysu Aug 13, 2018 •
edited
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because previous test is wrong and should be failure with

ERROR 1105 (HY000): unsupported modify column type 7 not match origin 12

- - and it's strange mustExec in ddl_test seems ignore the err and doesn't fail the case.

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The test doesn't init the testKit, but reuse the one in the suite, so the test case never fail.

s.mustExec(c, "drop table t")
}

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34 changes: 34 additions & 0 deletions executor/executor_test.go
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Expand Up @@ -3088,3 +3088,37 @@ func (s *testSuite) TestMaxOneRow(c *C) {
err = rs.Close()
c.Assert(err, IsNil)
}

func (s *testSuite) TestCurrentTimestampValueSelection(c *C) {
tk := testkit.NewTestKit(c, s.store)
tk.MustExec("use test")
tk.MustExec("drop table if exists t,t1")

tk.MustExec("create table t (id int, t0 timestamp null default current_timestamp, t1 timestamp(1) null default current_timestamp(1), t2 timestamp(2) null default current_timestamp(2) on update current_timestamp(2))")
tk.MustExec("insert into t (id) values (1)")
rs := tk.MustQuery("select t0, t1, t2 from t where id = 1")
t0 := rs.Rows()[0][0].(string)
t1 := rs.Rows()[0][1].(string)
t2 := rs.Rows()[0][2].(string)
c.Assert(len(strings.Split(t0, ".")), Equals, 1)
c.Assert(len(strings.Split(t1, ".")[1]), Equals, 1)
c.Assert(len(strings.Split(t2, ".")[1]), Equals, 2)
tk.MustQuery("select id from t where t0 = ?", t0).Check(testkit.Rows("1"))
tk.MustQuery("select id from t where t1 = ?", t1).Check(testkit.Rows("1"))
tk.MustQuery("select id from t where t2 = ?", t2).Check(testkit.Rows("1"))
time.Sleep(time.Second / 2)
tk.MustExec("update t set t0 = now() where id = 1")
rs = tk.MustQuery("select t2 from t where id = 1")
newT2 := rs.Rows()[0][0].(string)
c.Assert(newT2 != t2, IsTrue)

tk.MustExec("create table t1 (id int, a timestamp, b timestamp(2), c timestamp(3))")
tk.MustExec("insert into t1 (id, a, b, c) values (1, current_timestamp(2), current_timestamp, current_timestamp(3))")
rs = tk.MustQuery("select a, b, c from t1 where id = 1")
a := rs.Rows()[0][0].(string)
b := rs.Rows()[0][1].(string)
d := rs.Rows()[0][2].(string)
c.Assert(len(strings.Split(a, ".")), Equals, 1)
c.Assert(strings.Split(b, ".")[1], Equals, "00")
c.Assert(len(strings.Split(d, ".")[1]), Equals, 3)
}
3 changes: 2 additions & 1 deletion expression/helper.go
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Expand Up @@ -14,6 +14,7 @@
package expression

import (
"math"
"strings"
"time"

Expand Down Expand Up @@ -57,7 +58,7 @@ func GetTimeValue(ctx sessionctx.Context, v interface{}, tp byte, fsp int) (d ty
case string:
upperX := strings.ToUpper(x)
if upperX == strings.ToUpper(ast.CurrentTimestamp) {
value.Time = types.FromGoTime(defaultTime)
value.Time = types.FromGoTime(defaultTime.Truncate(time.Duration(math.Pow10(9-fsp)) * time.Nanosecond))
if tp == mysql.TypeTimestamp {
err = value.ConvertTimeZone(time.Local, ctx.GetSessionVars().Location())
if err != nil {
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