xiangfu0 opened a new pull request, #13340:
URL: https://github.com/apache/pinot/pull/13340
Fix the LEAD/LAG window function implementation to match the SQL syntax.
Syntax:
```sql
LEAD(column_name, offset, default_value) OVER (PARTITION BY partition_column
ORDER BY order_column)
LAG(column_name, offset, default_value) OVER (PARTITION BY partition_column
ORDER BY order_column)
```
- column_name: The column from which to retrieve the value.
- offset: The number of rows forward from the current row to access. Default
is 1 if not specified.
- default_value: The value to return if the offset goes beyond the number of
rows.
Example:
```
SELECT
employee_id,
salary,
LAG(salary, 1) OVER (ORDER BY employee_id) AS previous_salary
FROM employees;
```
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