main-cron: failure on end-to-end iceberg sink v2 test (release)

[fuyufjh]

Describe the bug

https://buildkite.com/risingwavelabs/main-cron/builds/1998#018e1846-fa8a-4950-b617-60da80bf8f0f

Error message/log

Command line is [sqllogictest -p 4566 -d dev test_case/iceberg_sink_upsert.slt]
Executing sql: SELECT * FROM demo_db.demo_table ORDER BY id, v1 ASC
Row(id=1, v1=1, v2=50, v3='1-50', v4=datetime.date(2022, 3, 11))
Row(id=1, v1=3, v2=2, v3='3-2', v4=datetime.date(2022, 3, 13))
Row(id=1, v1=8, v2=2, v3='8-2', v4=datetime.date(2022, 3, 18))
Row(id=1, v1=13, v2=2, v3='13-2', v4=datetime.date(2022, 3, 13))
    tc.assertEqual(len(df), len(rows))
  File "/usr/lib/python3.10/unittest/case.py", line 845, in assertEqual
    assertion_func(first, second, msg=msg)
  File "/usr/lib/python3.10/unittest/case.py", line 838, in _baseAssertEqual
    raise self.failureException(msg)
AssertionError: 4 != 7

To Reproduce

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Expected behavior

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How did you deploy RisingWave?

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The version of RisingWave

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Additional context

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