Update ListingTable to use StatisticsConverter, remove redundant statistics extraction code #10924
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alamb
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Jun 14, 2024
| ParquetStatistics::Int64(s) if DataType::Int64 == *fields[i].data_type() => { | ||
| if let Some(max_value) = &mut max_values[i] { | ||
| max_value | ||
| .update_batch(&[Arc::new(Int64Array::from_value(*s.max(), 1))]) |
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Previously, even though update_batch is called, it first creates a single row array
| } | ||
| } | ||
| let file_field = file_schema.field(file_idx); | ||
| let Some(converter) = StatisticsConverter::try_new( |
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this code now uses the well tested StatisticsConverter to extract statistics from the parquet file with the correct type of array in a single call
| // Note in ASCII lower case is greater than upper case | ||
| assert_eq!( | ||
| c1_stats.max_value, | ||
| Precision::Exact(ScalarValue::from("bar")) |
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strings were previously not handled, but are now properly handled by StatisticsConverter
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alamb
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Jun 17, 2024
| @@ -344,6 +344,24 @@ impl ColumnStatistics { | |||
| distinct_count: Precision::Absent, | |||
| } | |||
| } | |||
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| /// Set the null count for the column | |||
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These functions make creating ColumnStatitistic more ergonomic
alamb
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xinlifoobar
approved these changes
Jun 24, 2024
|
Thank you for the review @xinlifoobar
Update: let's work with #11068 (I didn't realize there was another PR) Thanks @xinlifoobar |
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Which issue does this PR close?
Closes #10923
Rationale for this change
The code that extracted statistics for ListingTable with parquet files:
I also personally also found the previous code somewhat hard to follow
See #10923 for more details
What changes are included in this PR?
Update Parquet listing table to use the new
StatisticsConverterAPI to create DataFusion statisticsAre these changes tested?
Yes, they are covered by existing tests
Are there any user-facing changes?
ListingFiles will now have more accurate statistics