test: make test TestIssue25506 stable

[crazycs520]

Signed-off-by: crazycs crazycs520@gmail.com

What problem does this PR solve?

As the title said.

[2021-06-21T13:13:11.256Z] ----------------------------------------------------------------------
[2021-06-21T13:13:11.256Z] FAIL: executor_test.go:8659: testSuite.TestIssue25506
[2021-06-21T13:13:11.256Z] 
[2021-06-21T13:13:11.256Z] executor_test.go:8668:
[2021-06-21T13:13:11.256Z]     tk.MustQuery("(select col_15 from tbl_23) union all (select col_15 from tbl_3 for update)").Check(testkit.Rows("\x00\x00\x0F", "\x00\xFF\xFF", "\x00\x00\xFF"))
[2021-06-21T13:13:11.256Z] /home/jenkins/agent/workspace/tidb_ghpr_check_2/go/src/github.com/pingcap/tidb/util/testkit/testkit.go:63:
[2021-06-21T13:13:11.256Z]     res.c.Assert(resBuff.String(), check.Equals, needBuff.String(), res.comment)
[2021-06-21T13:13:11.256Z] ... obtained string = "" +
[2021-06-21T13:13:11.256Z] ...     "[\x00\xff\xff]\n" +
[2021-06-21T13:13:11.256Z] ...     "[\x00\x00\xff]\n" +
[2021-06-21T13:13:11.256Z] ...     "[\x00\x00\x0f]\n"
[2021-06-21T13:13:11.256Z] ... expected string = "" +
[2021-06-21T13:13:11.256Z] ...     "[\x00\x00\x0f]\n" +
[2021-06-21T13:13:11.256Z] ...     "[\x00\xff\xff]\n" +
[2021-06-21T13:13:11.256Z] ...     "[\x00\x00\xff]\n"
[2021-06-21T13:13:11.256Z] ... sql:(select col_15 from tbl_23) union all (select col_15 from tbl_3 for update), args:[]

Check List

Tests

• No code

Side effects

• N/A

Release note

• No release note.

[crazycs520]

/run-all-tests

[crazycs520]

@zhaoxugang @wshwsh12 @mmyj PTAL

[ti-chi-bot]

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[lysu]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

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Commit hash: b0edb32