alpass163 opened a new pull request, #17064: URL: https://github.com/apache/iotdb/pull/17064
Description: This PR introduces robust support for NULL timestamps in FIRST, LAST, FIRST_BY, and LAST_BY aggregation functions. Previously, rows with NULL time might have been handled inconsistently or ignored. Key Changes: Null Time Handling Strategy: Priority: Data with a Valid Time always takes precedence over data with a Null Time. Fallback Policy: If only NULL time data exists, the aggregations now adopt a "First Null Wins" strategy. This means the first encountered value with a NULL timestamp is retained as the result, ensuring consistent behavior across both First and Last families. Comprehensive Support: Applied these changes to both standard Accumulators (for global aggregation) and GroupedAccumulators (for GROUP BY queries). Covered all supported data types (INT32, INT64, FLOAT, DOUBLE, BINARY, BOOLEAN). -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
