Details
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Bug
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Status: Stalled (View Workflow)
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Major
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Resolution: Unresolved
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10.4
Description
MySQL prints information about filesort in the optimizer trace too
For a query SELECT * FROM t1 ORDER BY a desc, in the optimizer trace we see:
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{
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"filesort_information": [
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{
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"direction": "desc",
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"table": "`t1`",
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"field": "a"
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}
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],
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"filesort_priority_queue_optimization": {
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"usable": false,
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"cause": "not applicable (no LIMIT)"
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},
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"filesort_execution": [
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],
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"filesort_summary": {
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"rows": 100,
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"examined_rows": 100,
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"number_of_tmp_files": 0,
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"sort_buffer_size": 32456,
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"sort_mode": "<sort_key, packed_additional_fields>"
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}
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}
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So it would be good to have the filesort summary also in the optimizer trace of MariaDB