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

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

Handles the special "columns" column used by the text reader, and available to similar readers.

Related Packages

Package	Description
org.apache.drill.exec.physical.impl.scan	Defines the scan operation implementation.
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.file	Handles optional file metadata columns: implicit columns and partition columns.
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
ColumnsArrayManager	Handles the special case in which the entire row is returned as a "columns" array.
ColumnsArrayParser	Parses the `columns` array.
ColumnsScanFramework	Scan framework for a file that supports the special "columns" column.
ColumnsScanFramework.ColumnsScanBuilder
ColumnsScanFramework.ColumnsSchemaNegotiatorImpl	Implementation of the columns array schema negotiator.
ColumnsSchemaNegotiator	Schema negotiator that supports the file scan options plus access to the specific selected columns indexes.
ResolvedColumnsArrayColumn
UnresolvedColumnsArrayColumn