Dandandan opened a new issue, #1:
URL: https://github.com/apache/datafusion/issues/1
### Describe the bug
`lead` panics during planning when given `i64::MIN` as the offset. The
implementation negates lead offsets, and negating `i64::MIN` overflows.
### To Reproduce
```sql
EXPLAIN SELECT lead(x, -9223372036854775808) OVER (ORDER BY x)
FROM (VALUES (1)) AS t(x);
```
### Actual behavior
```text
thread 'main' panicked at .../library/core/src/ops/arith.rs:
attempt to negate with overflow
```
### Expected behavior
Return a planning error for an invalid offset, not a panic.
### Notes
The SQL reaches `datafusion/functions-window/src/lead_lag.rs`, where
`WindowShiftKind::Lead` maps the offset through `v.neg()`.
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