pingcap / pingcap/tidb

The data_sub() function returns null when using extreme base date

Open
#63,719 2 comments 0 reactions 1 assignee Claimed by @GorilaMond View on GitHub
contribution first-time-contributor sig/execution type/bug
Dominant language
Go
Stars
40.5k
Forks
6.2k
PR merge metrics
PR metrics pending

Description

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

```sql
select date_sub('0000-01-01 00:00:00', interval '-1-0' YEAR_MONTH);
```

### 2. What did you expect to see? (Required)

mysql8

```sql
+-------------------------------------------------------------+
| date_sub('0000-01-01 00:00:00', interval '-1-0' YEAR_MONTH) |
+-------------------------------------------------------------+
| 0001-01-01 00:00:00 |
+-------------------------------------------------------------+
1 row in set (0.00 sec)

```

### 3. What did you see instead (Required)

```sql
+-------------------------------------------------------------+
| date_sub('0000-01-01 00:00:00', interval '-1-0' YEAR_MONTH) |
+-------------------------------------------------------------+
| NULL |
+-------------------------------------------------------------+
1 row in set, 1 warning (0.00 sec)

```

### 4. What is your TiDB version? (Required)

```sql
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tidb_version() |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Release Version: v7.5.1
Edition: Community
Git Commit Hash: 7d16cc79e81bbf573124df3fd9351c26963f3e70
Git Branch: heads/refs/tags/v7.5.1
UTC Build Time: 2024-02-27 14:28:32
GoVersion: go1.21.6
Race Enabled: false
Check Table Before Drop: false
Store: unistore |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
```

Contributor guide

Open the contributing guide

Assessment

This issue has not been assessed yet.

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.