org.apache.drill.exec.physical.resultSet.model

Interface MetadataProvider

All Known Implementing Classes:

MetadataProvider.ArraySchemaCreator, MetadataProvider.ArraySchemaRetrieval, MetadataProvider.MetadataCreator, MetadataProvider.MetadataRetrieval, MetadataProvider.VariantSchemaCreator, MetadataProvider.VariantSchemaRetrieval

public interface MetadataProvider

Interface for retrieving and/or creating metadata given a vector. Subclasses either generate metadata to match an existing schema (such as in a vector batch), or walk a metadata schema to drive writer creation.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	MetadataProvider.ArraySchemaCreator
static class	MetadataProvider.ArraySchemaRetrieval
static class	MetadataProvider.MetadataCreator
static class	MetadataProvider.MetadataRetrieval
static class	MetadataProvider.VariantSchemaCreator
static class	MetadataProvider.VariantSchemaRetrieval
static class	MetadataProvider.VectorDescrip

Method Summary

Modifier and Type	Method and Description
MetadataProvider	childProvider(ColumnMetadata colMetadata)
ColumnMetadata	metadata(int index, MaterializedField field)
TupleMetadata	tuple()
VariantMetadata	variant()

Method Detail

metadata

ColumnMetadata metadata(int index,
                        MaterializedField field)

childProvider

MetadataProvider childProvider(ColumnMetadata colMetadata)

tuple

TupleMetadata tuple()

variant

VariantMetadata variant()