panic: lag window function negates i64::MIN offset during execution

[Dandandan]

Describe the bug

lag panics during execution when given i64::MIN as the offset. The execution path negates the stored negative shift offset.

To Reproduce

SELECT lag(x, -9223372036854775808) OVER (ORDER BY x)
FROM (VALUES (1)) AS t(x);

Actual behavior

thread 'main' panicked at datafusion/functions-window/src/lead_lag.rs:520:57:
attempt to negate with overflow

Expected behavior

Return an execution error for an invalid offset, not a panic.