UsesMetadataFields¶

UsesMetadataFields is an abstraction of components that use metadata fields (from a delta table's transaction log).

Contract¶

maxValues¶

The largest (possibly truncated) value for a column

Used when:

• DataSkippingReaderBase is requested to verifyStatsForFilter and getStatsColumnOpt
• ColumnPredicateBuilder is requested to equalTo, notEqualTo, greaterThan, greaterThanOrEqual
• DataFiltersBuilder is requested to constructDataFilters
• StatisticsCollection is requested to statsCollector and statsSchema

minValues¶

The smallest (possibly truncated) value for a column

nullCount¶

The number of null values present for a column

numRecords¶

The total number of records in the file

Implementations¶

• ColumnPredicateBuilder
• ReadsMetadataFields
• StatisticsCollection