bug: The instance is crashed when extracting data from the union all result set of decimal and integer.

[haitaoguan]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Please confirm if bug report does NOT exists already ?

• I confirm there is no existing issue for this

Describe the problem

SELECT IF(@rowno != a.taxis_no, @rankno := 1, @rankno := @rankno + 1) AS "rowNos",
       IFNULL(a.out_amount / 1, '-') out_amount
  FROM (SELECT a.*
          FROM (SELECT a.currency_id, a.out_amount, d.taxis_no
                  FROM (SELECT b.CURRENCY_ID, a.account_id, 0 out_amount
                          FROM C1AM_ACCT_DAY a, C1MD_BANK_ACCT b
                         WHERE a.account_id = b.ROW_ID
                        UNION ALL
                        SELECT b.CURRENCY_ID,
                               a.account_id,
                               sum(a.out_amount) out_amount
                          FROM C1AM_BANK_LIST a, C1MD_BANK_ACCT b
                         WHERE a.account_id = b.ROW_ID
                         GROUP BY a.account_id, b.CURRENCY_ID) a
                  JOIN C1MD_BANK_ACCT b
                    on b.row_id = a.account_id
                  JOIN C1MD_COMPANY c
                    on c.row_id = b.company_id
                  JOIN C1CD_CURRENCY d
                    ON a.currency_id = d.row_id
                 WHERE 1 = 1
                   AND c.row_id IN (SELECT t1.row_id
                                      FROM C1MD_COMPANY t1, C1MD_COMPANY t2
                                     WHERE t1.sys_id = t2.sys_id)) a) a
ERROR 2013 (HY000): Lost connection to MySQL server during query

Expected behavior

No response

How To Reproduce

No response

Environment

./mysqld Ver 5.7.36-StoneDB-v1.0.1 for Linux on x86_64 (build-)
build information as follow:
Repository address: https://github.com/stoneatom/stonedb.git:stonedb-5.7-dev
Branch name: stonedb-5.7-dev
Last commit ID: 1f43e44
Last commit time: Date: Wed May 31 17:34:21 2023 +0800
Build time: Date: Thu Jun 1 07:20:38 UTC 2023

Are you interested in submitting a PR to solve the problem?

• Yes, I will!