ClickHouse / ClickHouse/clickhouse-cpp

Bug in MAX Function with MergeTree Engine

Open
#403 1 comment 0 reactions 0 assignees View on GitHub
bug need-info
Dominant language
C
Stars
382
Forks
209
Avg merge
3h 58m
Merged PRs (30d)
12

Description

Dear CK Team, I have a bug that I need to report to you.

Description:
While using the MAX/MIN function on a column with MergeTree table engine, the query produces inconsistent results. Specifically, this bug is triggered when a specific partition key is selected and the corresponding column contains NaN values

Steps to Reproduce:
```
CREATE TABLE t1 (c0 Int32)
ENGINE = MergeTree()
ORDER BY c0
PARTITION BY (toUInt64 (c0))

INSERT INTO t1 (c0)
VALUES (-766544500), (2052205600), (2064494500), (824848640), (0)

SELECT MAX(-(c0/c0/c0+c0))
FROM t1
```

Expected Behavior:
The result should be consistent and return the unique positive value 766544500.

Actual Behavior:
Different values are returned across multiple queries, including all values in c0 execpt NaN ( -766544500, 2052205600, 2064494500, 824848640, 0).

Environment
OS:Ubuntu Server 22.04 LTS 64bit
TDengine Version:24.5.1.1010 (official build)

Contributor guide

No contributing guide indexed for this repository

Assessment

This issue has not been assessed yet.

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.