feat(common): inject _block_num statistics into physical plan#2031
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feat(common): inject _block_num statistics into physical plan#2031
_block_num statistics into physical plan#2031Conversation
Override _block_num column min/max on the Statistics passed to FileScanConfig in scan(), using synced_range. This is where DataFusion's AggregateStatistics optimizer reads from, enabling it to resolve MIN/MAX(_block_num) as constants without scanning parquet files.
Theodus
changed the title
_block_num statistics into physical plan
fordN
approved these changes
Mar 26, 2026
leoyvens
reviewed
Mar 29, 2026
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| // Override _block_num column statistics with exact min/max from synced_range. | ||
| // This enables the AggregateStatistics optimizer to resolve MIN/MAX(_block_num) |
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This seems wrong, the start and end range of the synced segment are not necessarily represented as column values. E.g. the segment could have zero rows.
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Implement TableProvider::statistics() on QueryableSnapshot to report exact _block_num column min/max from synced range. DataFusion's AggregateStatistics optimizer replaces MIN/MAX aggregates with constants when exact statistics are available, avoiding full parquet scans.