flow result incorrect

[slitobo]

What type of bug is this?

Unexpected error

What subsystems are affected?

Standalone mode

Minimal reproduce step

I referenced this document to verify the usage of flow, but it reported an error in version v0.9
https://docs.greptime.cn/user-guide/flow-computation/continuous-aggregation

What did you expect to see?

flow is working ok , table ngx_country is ok .

What did you see instead?

// select * from ngx_access_log limit 1;

1640966400000	client1	US

// show flows;
calc_ngx_country

// select * from ngx_country;
nothing

log:

2024-10-22T11:54:40.381756Z ERROR flow::adapter: Flow 1029 has following errors: 0: Internal error: Accum and output should have the non-zero and same length, found accum.len() = 0, output.len() = 0, at src/flow/src/compute/render/reduce.rs:859:9

What operating system did you use?

centos7

What version of GreptimeDB did you use?

0.9.3

Relevant log output and stack trace

2024-10-22T11:54:40.381756Z ERROR flow::adapter: Flow 1029 has following errors: 0: Internal error: Accum and output should have the non-zero and same length, found accum.len() = 0, output.len() = 0, at src/flow/src/compute/render/reduce.rs:859:9

[killme2008]

@discord9 Please take a look

[discord9]

This bug is fixed in v0.9.5 release in #4599(specifically in here), so if it isn't too much trouble updating database to latest version should make this bug go away.

[slitobo]

i chage to v0.9.5, try this: https://docs.greptime.cn/user-guide/continuous-aggregation/overview
but get a error:

2024-10-22T12:19:44.061559Z ERROR flow::adapter: Send writeback request errors err=0: External error, at src/flow/src/adapter.rs:316:30
1: External error, at src/flow/src/server.rs:497:14
2: Failed to insert data, at /greptimedb/src/operator/src/insert.rs:333:26
3: External error, at src/frontend/src/instance/standalone.rs:87:14
4: Operation to region server failed, at src/frontend/src/instance/standalone.rs:69:14
5: Execute gRPC request error, at src/datanode/src/region_server.rs:381:18
6: Failed to handle request for region 4745938862080(1105, 0), at src/datanode/src/region_server.rs:770:14
7: Invalid request to region 4745938862080(1105, 0), reason: value has type Int64, but column high_size_count has type Ok(Float64)(10), at src/mito2/src/request.rs:372:9

[slitobo]

After updating to 0.9.5, it works normally