gaodayue opened a new issue #5553:
URL: https://github.com/apache/incubator-doris/issues/5553
For queries that return a large number of rows and columns, we observed
that `MysqlResultWriter` may become a bottleneck.
For example, the query below returns 18K rows and 100 bigint columns for
each row. And we observed that `TupleConvertTime` accounts for **51%** of the
total execution time.
```
Fragment 0:
Instance 4c71a7a8e4fe447c-9840e16d115713b4:(Active: 363.487ms, %
non-child: 49.92%)
- AverageThreadTokens: 4607182418800017400.00
- MemoryLimit: 8.00 GB
- PeakMemoryUsage: 15.75 MB
- PeakReservation: 0.00
- PeakUsedReservation: 0.00
- RowsProduced: 18.002K (18002)
DataBufferSender
(dst_fragment_instance_id=4c71a7a8e4fe447c-9840e16d115713b4):
- AppendBatchTime: 194.511ms
- ResultRendTime: 5.220ms
- TupleConvertTime: 185.573ms
- NumSentRows: 18.002K (18002)
```
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