Package org.apache.drill.exec.physical.impl.scan.file

package org.apache.drill.exec.physical.impl.scan.file

Handles optional file metadata columns: implicit columns and partition columns. Not all data sources are files, and so not all support these columns

Related Packages

Package	Description
org.apache.drill.exec.physical.impl.scan	Defines the scan operation implementation.
org.apache.drill.exec.physical.impl.scan.columns	Handles the special "columns" column used by the text reader, and available to similar readers.
org.apache.drill.exec.physical.impl.scan.convert	Standard type conversion tools for the case in which the input types are the standard Java types already supported by the ValuesWriter interface.
org.apache.drill.exec.physical.impl.scan.framework	Defines the projection, vector continuity and other operations for a set of one or more readers.
org.apache.drill.exec.physical.impl.scan.project	Provides run-time semantic analysis of the projection list for the scan operator.
org.apache.drill.exec.physical.impl.scan.v3	Provides the "version 3" scan framework (which can also be thought of as EVF version 2).

Class	Description
FileMetadata	Specify the file name and optional selection root.
FileMetadataColumn	Represents projection column which resolved to a file metadata (AKA "implicit") column such as "filename", "fqn", etc.
FileMetadataColumnDefn	Definition of a file metadata (AKA "implicit") column for this query.
FileMetadataColumnsParser	Parses the implicit file metadata columns out of a project list, and marks them for special handling by the file metadata manager.
FileScanFramework	The file scan framework adds into the scan framework support for implicit reading from DFS splits (a file and a block).
FileScanFramework.FileReaderFactory	Iterates over the splits for the present scan.
FileScanFramework.FileRowSetContext
FileScanFramework.FileScanBuilder	Options for a file-based scan.
FileScanFramework.FileSchemaNegotiator	The file schema negotiator adds no behavior at present, but is created as a placeholder anticipating the need for file-specific behavior later.
FileScanFramework.FileSchemaNegotiatorImpl	Implementation of the file-level schema negotiator.
ImplicitColumnManager	Manages the insertion of file metadata (AKA "implicit" and partition) columns.
ImplicitColumnManager.ImplicitColumnOptions
MetadataColumn	Resolved value for a metadata column (implicit file or partition column.) Resolution here means identifying a value for the column.
PartitionColumn	Represents a partition column (usually dir0, dir1, ...).