joker-star-l commented on PR #39546:
URL: https://github.com/apache/doris/pull/39546#issuecomment-2303913087
> > @superdiaodiao @yiguolei Hello, is this ......
> > Am I using it incorrectly?
>
> Actually, we have to add FE codes manually rather than generating it,
since generating code was out of date and served as a temporary method before.
Thank you. I add it manually. But when I did the e2e test, I got a strange
error. (This error did not occur when I did unit test in the be)
The agg function `linear_histogram` returns a json str.
I got different double values in json with same query and data.
The test case:
```
CREATE TABLE IF NOT EXISTS histogram_test
(
a int
)
ENGINE = OLAP
DUPLICATE KEY(a)
DISTRIBUTED BY HASH(a) BUCKETS AUTO
PROPERTIES (
"replication_num" = "1"
)
;
insert into histogram_test values (1);
insert into histogram_test values (2);
insert into histogram_test values (3);
insert into histogram_test values (4);
insert into histogram_test values (5);
insert into histogram_test values (6);
insert into histogram_test values (7);
insert into histogram_test values (8);
select linear_histogram(a, 2) from histogram_test;
```
The result of the first execution:
```
{"num_buckets":5,"buckets":[{"lower":4.6737435351163e-310,"upper":9.34748707015187e-310,"count":1,"acc_count":1},{"lower":9.34748707015187e-310,"upper":1.402123060518747e-309,"count":2,"acc_count":3},{"lower":1.402123060518747e-309,"upper":1.869497414022306e-309,"count":2,"acc_count":5},{"lower":1.869497414022306e-309,"upper":2.336871767525866e-309,"count":2,"acc_count":7},{"lower":2.336871767525866e-309,"upper":2.804246121029425e-309,"count":1,"acc_count":8}]}
```
The result of the second execution:
```
{"num_buckets":5,"buckets":[{"lower":9.399408234378048e218,"upper":3.8141098555780214e228,"count":1,"acc_count":1},{"lower":3.8141098555780214e228,"upper":7.628219710216102e228,"count":2,"acc_count":3},{"lower":7.628219710216102e228,"upper":1.1442329564854183e229,"count":2,"acc_count":5},{"lower":1.1442329564854183e229,"upper":1.5256439419492263e229,"count":2,"acc_count":7},{"lower":1.5256439419492263e229,"upper":1.9070549274130343e229,"count":1,"acc_count":8}]}
```
The result of the third execution:
```
{"num_buckets":5,"buckets":[{"lower":0.0,"upper":2.0,"count":1,"acc_count":1},{"lower":2.0,"upper":4.0,"count":2,"acc_count":3},{"lower":4.0,"upper":6.0,"count":2,"acc_count":5},{"lower":6.0,"upper":8.0,"count":2,"acc_count":7},{"lower":8.0,"upper":10.0,"count":1,"acc_count":8}]}
```
...
Only the result of the third execution is correct. I am very confused about
this. Why this happens?
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