trait FileIndex extends AnyRef
An interface for objects capable of enumerating the root paths of a relation as well as the partitions of a relation subject to some pruning expressions.
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- abstract def inputFiles: Array[String]
Returns the list of files that will be read when scanning this relation.
Returns the list of files that will be read when scanning this relation. This call may be very expensive for large tables.
- abstract def listFiles(partitionFilters: Seq[Expression], dataFilters: Seq[Expression]): Seq[PartitionDirectory]
Returns all valid files grouped into partitions when the data is partitioned.
Returns all valid files grouped into partitions when the data is partitioned. If the data is unpartitioned, this will return a single partition with no partition values.
- partitionFilters
The filters used to prune which partitions are returned. These filters must only refer to partition columns and this method will only return files where these predicates are guaranteed to evaluate to
true. Thus, these filters will not need to be evaluated again on the returned data.- dataFilters
Filters that can be applied on non-partitioned columns. The implementation does not need to guarantee these filters are applied, i.e. the execution engine will ensure these filters are still applied on the returned files.
- abstract def partitionSchema: StructType
Schema of the partitioning columns, or the empty schema if the table is not partitioned.
- abstract def refresh(): Unit
Refresh any cached file listings
- abstract def rootPaths: Seq[Path]
Returns the list of root input paths from which the catalog will get files.
Returns the list of root input paths from which the catalog will get files. There may be a single root path from which partitions are discovered, or individual partitions may be specified by each path.
- abstract def sizeInBytes: Long
Sum of table file sizes, in bytes
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- def metadataOpsTimeNs: Option[Long]
Returns an optional metadata operation time, in nanoseconds, for listing files.
Returns an optional metadata operation time, in nanoseconds, for listing files.
We do file listing in query optimization (in order to get the proper statistics) and we want to account for file listing time in physical execution (as metrics). To do that, we save the file listing time in some implementations and physical execution calls it in this method to update the metrics.
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