Package org.apache.drill.exec.physical.impl.scan.v3.schema

Class ScanProjectionParser

java.lang.Object

org.apache.drill.exec.physical.impl.scan.v3.schema.ScanProjectionParser

public class ScanProjectionParser
extends Object

Parse the projection list into a dynamic tuple schema. Using an enhanced form of dynamic column which records projection list information (such as map members and array indexes.)

A wildcard project list can contain implicit columns in addition to the wildcard. The wildcard defines the insert point: the point at which reader-defined columns are inserted as found.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ScanProjectionParser.ProjectionParseResult

Field Summary

Fields

Modifier and Type	Field	Description
static final String	PROJECT_ALL
static final String	PROJECT_NONE
static final String	PROJECTION_TYPE_PROP

Constructor Summary

Constructors

Constructor	Description
ScanProjectionParser()

Method Summary

Modifier and Type	Method	Description
static ScanProjectionParser.ProjectionParseResult	parse(Collection<SchemaPath> projList)
protected ProjectedColumn	project(TupleMetadata tuple, String colName)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

PROJECTION_TYPE_PROP

public static final String PROJECTION_TYPE_PROP

See Also:

• Constant Field Values

PROJECT_ALL

public static final String PROJECT_ALL

See Also:

• Constant Field Values

PROJECT_NONE

public static final String PROJECT_NONE

See Also:

• Constant Field Values

Constructor Details

ScanProjectionParser

public ScanProjectionParser()

Method Details

parse

public static ScanProjectionParser.ProjectionParseResult parse(Collection<SchemaPath> projList)

project

protected ProjectedColumn project(TupleMetadata tuple,
 String colName)