org.apache.drill.exec.physical.impl.scan.project

Class WildcardSchemaProjection

java.lang.Object

org.apache.drill.exec.physical.impl.scan.project.ReaderLevelProjection

org.apache.drill.exec.physical.impl.scan.project.WildcardSchemaProjection

public class WildcardSchemaProjection
extends ReaderLevelProjection

Perform a wildcard projection with an associated output schema. Matches the reader schema against the output schema. If a column appears, it is projected into the output schema. If not found, then a null column (as defined by the output schema) is projected.

Note that we don't go down this path for strict schema: in that case we expanded the columns at the scan level.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.drill.exec.physical.impl.scan.project.ReaderLevelProjection

ReaderLevelProjection.ReaderProjectionResolver

Field Summary

Fields inherited from class org.apache.drill.exec.physical.impl.scan.project.ReaderLevelProjection

resolvers

Constructor Summary

Constructors

Constructor and Description
WildcardSchemaProjection(ScanLevelProjection scanProj, TupleMetadata readerSchema, ResolvedTuple rootTuple, List<ReaderLevelProjection.ReaderProjectionResolver> resolvers)

Method Summary

Methods inherited from class org.apache.drill.exec.physical.impl.scan.project.ReaderLevelProjection

resolveSpecial

Methods inherited from class java.lang.Object

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

Constructor Detail

WildcardSchemaProjection

public WildcardSchemaProjection(ScanLevelProjection scanProj,
                                TupleMetadata readerSchema,
                                ResolvedTuple rootTuple,
                                List<ReaderLevelProjection.ReaderProjectionResolver> resolvers)