branch-4.0: [Enhancement](explain)Display deleteFileNum for FileScanNode when explain verbose #60308#60437
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yiguolei merged 1 commit intobranch-4.0from Feb 3, 2026
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…lain verbose (#60308) ### What problem does this PR solve? Problem Summary: This PR enhances the output of EXPLAIN VERBOSE for File Scan nodes by adding the following metrics: `dataFileNum=xxx, deleteFileNum=xxx, deleteSplitNum=xxx` Especially useful for iceberg/paimon/hive acid These metrics provide more visibility into the underlying file and split layout, helping users better tune parameters and control query performance. Details: `dataFileNum` : The number of distinct data files that need to be read. This is not equivalent to the number of splits, since a single data file can be divided into multiple splits. `deleteFileNum` : The number of distinct delete files that need to be read. `deleteSplitNum` : Added because the relationship between data files and delete files is many-to-many: one data file may be associated with multiple delete files one delete file may apply to multiple data files Using deleteSplitNum / dataSplitNum, users can estimate the average number of delete splits that need to be read per data split. Example: ``` mysql> explain verbose select * from iceberg.format_v3.dv_test_1w; +-----------------------------------------------------------------------------------------------------------------------------------------------+ | Explain String(Nereids Planner) | +-----------------------------------------------------------------------------------------------------------------------------------------------+ | PLAN FRAGMENT 0 | | OUTPUT EXPRS: | | id[#0] | | grp[#1] | | value[#2] | | ts[#3] | | PARTITION: RANDOM | | | | HAS_COLO_PLAN_NODE: false | | | | VRESULT SINK | | MYSQL_PROTOCOL | | | | 0:VICEBERG_SCAN_NODE(32) | | table: iceberg.format_v3.dv_test_1w | | inputSplitNum=220, totalFileSize=720774, scanRanges=220 | | partition=0/0 | | backends: | | 1769590309070 | | s3://warehouse/wh/format_v3/dv_test_1w/data/00004-51-fc462f9a-d42a-404d-adfc-c8d2781c8d04-0-00001.parquet start: 4 length: 2672 | | s3://warehouse/wh/format_v3/dv_test_1w/data/00003-50-fc462f9a-d42a-404d-adfc-c8d2781c8d04-0-00001.parquet start: 4 length: 2852 | | s3://warehouse/wh/format_v3/dv_test_1w/data/00000-47-fc462f9a-d42a-404d-adfc-c8d2781c8d04-0-00001.parquet start: 4 length: 2894 | | ... other 216 files ... | | s3://warehouse/wh/format_v3/dv_test_1w/data/00001-48-fc462f9a-d42a-404d-adfc-c8d2781c8d04-0-00001.parquet start: 58397 length: 13894 | | dataFileNum=10, deleteFileNum=1 deleteSplitNum=220 | | cardinality=33334, numNodes=1 | | pushdown agg=NONE | | tuple ids: 0 | | | | Tuples: | | TupleDescriptor{id=0, tbl=dv_test_1w} | | SlotDescriptor{id=0, col=id, colUniqueId=1, type=bigint, nullable=true, isAutoIncrement=false, subColPath=null, virtualColumn=null} | | SlotDescriptor{id=1, col=grp, colUniqueId=2, type=int, nullable=true, isAutoIncrement=false, subColPath=null, virtualColumn=null} | | SlotDescriptor{id=2, col=value, colUniqueId=3, type=int, nullable=true, isAutoIncrement=false, subColPath=null, virtualColumn=null} | | SlotDescriptor{id=3, col=ts, colUniqueId=4, type=datetimev2(6), nullable=true, isAutoIncrement=false, subColPath=null, virtualColumn=null} | | | | | | | | | | ========== STATISTICS ========== | +-----------------------------------------------------------------------------------------------------------------------------------------------+ ```
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yiguolei
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Feb 3, 2026
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Cherry-picked from #60308