randgen test break by #26545

## Bug Report

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```
[2021-08-11T11:54:25.941Z] 2021/08/11 19:54:25.399  [fatal] run test [udaf_bitand_union] err: sql:select bit_and(`col_float_unsigned_key`) as a from (select * from `table20_int_autoinc` union all select * from `table40_int_autoinc`) tmp group by tmp.`col_double_signed_key`, tmp.`col_decimal_6_3_signed` order by a;: failed to run query 

[2021-08-11T11:54:25.942Z] "select bit_and(`col_float_unsigned_key`) as a from (select * from `table20_int_autoinc` union all select * from `table40_int_autoinc`) tmp group by tmp.`col_double_signed_key`, tmp.`col_decimal_6_3_signed` order by a;" 

[2021-08-11T11:54:25.942Z]  around line 555, 

[2021-08-11T11:54:25.942Z] we need(439):

[2021-08-11T11:54:25.942Z] select bit_and(`col_float_unsigned_key`) as a from (select * from `table20_int_autoinc` union all select * from `table40_int_autoinc`) tmp group by tmp.`col_double_signed_key`, tmp.`col_decimal_6_3_signed` order by a;

[2021-08-11T11:54:25.942Z] a

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 47

[2021-08-11T11:54:25.942Z] select bit_and(`col_double_unsigned_key`) as a from (select * from `table40_int_autoinc` union all select * from `

[2021-08-11T11:54:25.942Z] but got(439):

[2021-08-11T11:54:25.942Z] select bit_and(`col_float_unsigned_key`) as a from (select * from `table20_int_autoinc` union all select * from `table40_int_autoinc`) tmp group by tmp.`col_double_signed_key`, tmp.`col_decimal_6_3_signed` order by a;

[2021-08-11T11:54:25.942Z] a

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 0

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 1

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 13

[2021-08-11T11:54:25.942Z] 47

[2021-08-11T11:54:25.942Z] 18446744073709551505

[2021-08-11T11:54:25.942Z] 18446744073709551505

[2021-08-11T11:54:25.942Z] 18446744073709551560

[2021-08-11T11:54:25.942Z] 18446744073709551607

[2021-08-11T11:54:25.942Z] 18446744073709551607

[2021-08-11T11:54:25.942Z] 18446744073709551615

[2021-08-11T11:54:25.942Z] 

[2021-08-11T11:54:25.942Z] 
```

### 1. Minimal reproduce step (Required)
introduce in https://github.com/pingcap/tidb/pull/26545

in ci https://ci.pingcap.net/blue/organizations/jenkins/tidb_ghpr_integration_common_test/detail/tidb_ghpr_integration_common_test/6102/pipeline



### 2. What did you expect to see? (Required)

### 3. What did you see instead (Required)

### 4. What is your TiDB version? (Required)

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randgen test break by #26545 #27124

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randgen test break by #26545 #27124

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