Uses of Package
org.apache.drill.exec.physical.impl.scan.project

Packages that use org.apache.drill.exec.physical.impl.scan.project

Package	Description
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.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.

Classes in org.apache.drill.exec.physical.impl.scan.project used by org.apache.drill.exec.physical.impl.scan.columns

Class and Description
AbstractUnresolvedColumn Represents a projected column that has not yet been bound to a table column, special column or a null column.
ColumnProjection Core interface for a projected column.
ReaderLevelProjection.ReaderProjectionResolver Reader-level projection is customizable.
ResolvedColumn A resolved column has a name, and a specification for how to project data from a source vector to a vector in the final output container.
ResolvedTableColumn Column that matches one provided by the table.
ResolvedTuple Drill rows are made up of a tree of tuples, with the row being the root tuple.
ScanLevelProjection Parses and analyzes the projection list passed to the scanner.
ScanLevelProjection.ScanProjectionParser Interface for add-on parsers, avoids the need to create a single, tightly-coupled parser for all types of columns.
ScanSchemaOrchestrator.ScanOrchestratorBuilder
VectorSource Generic mechanism for retrieving vectors from a source tuple when projecting columns to the output tuple.

Classes in org.apache.drill.exec.physical.impl.scan.project used by org.apache.drill.exec.physical.impl.scan.file

Class and Description
ColumnProjection Core interface for a projected column.
ConstantColumnLoader.ConstantColumnSpec
MetadataManager Queries can contain a wildcard (*), table columns, or special system-defined columns (the file metadata columns AKA implicit columns, the `columns` column of CSV, etc.).
ReaderLevelProjection.ReaderProjectionResolver Reader-level projection is customizable.
ResolvedColumn A resolved column has a name, and a specification for how to project data from a source vector to a vector in the final output container.
ResolvedTuple Drill rows are made up of a tree of tuples, with the row being the root tuple.
ScanLevelProjection Parses and analyzes the projection list passed to the scanner.
ScanLevelProjection.ScanProjectionParser Interface for add-on parsers, avoids the need to create a single, tightly-coupled parser for all types of columns.
ScanSchemaOrchestrator.ScanOrchestratorBuilder
VectorSource Generic mechanism for retrieving vectors from a source tuple when projecting columns to the output tuple.

Classes in org.apache.drill.exec.physical.impl.scan.project used by org.apache.drill.exec.physical.impl.scan.framework

Class and Description
ReaderSchemaOrchestrator Orchestrates projection tasks for a single reader within the set that the scan operator manages.
ScanSchemaOrchestrator Performs projection of a record reader, along with a set of static columns, to produce the final "public" result set (record batch) for the scan operator.
ScanSchemaOrchestrator.ScanOrchestratorBuilder

Classes in org.apache.drill.exec.physical.impl.scan.project used by org.apache.drill.exec.physical.impl.scan.project

Class and Description
AbstractUnresolvedColumn Represents a projected column that has not yet been bound to a table column, special column or a null column.
ColumnProjection Core interface for a projected column.
ConstantColumnLoader.ConstantColumnSpec
MetadataManager Queries can contain a wildcard (*), table columns, or special system-defined columns (the file metadata columns AKA implicit columns, the `columns` column of CSV, etc.).
NullColumnBuilder Manages null columns by creating a null column loader for each set of non-empty null columns.
NullColumnBuilder.NullBuilderBuilder
NullColumnLoader.NullColumnSpec
ReaderLevelProjection Computes the full output schema given a table (or batch) schema.
ReaderLevelProjection.ReaderProjectionResolver Reader-level projection is customizable.
ReaderSchemaOrchestrator Orchestrates projection tasks for a single reader within the set that the scan operator manages.
ResolvedColumn A resolved column has a name, and a specification for how to project data from a source vector to a vector in the final output container.
ResolvedDictColumn
ResolvedMapColumn Represents a column which is implicitly a map (because it has children in the project list), but which does not match any column in the table.
ResolvedNullColumn Projected column that serves as both a resolved column (provides projection mapping) and a null column spec (provides the information needed to create the required null vectors.)
ResolvedTuple Drill rows are made up of a tree of tuples, with the row being the root tuple.
ResolvedTuple.ResolvedDict
ResolvedTuple.ResolvedMap Represents a map implied by the project list, whether or not the map actually appears in the table schema.
ScanLevelProjection Parses and analyzes the projection list passed to the scanner.
ScanLevelProjection.Builder
ScanLevelProjection.ScanProjectionParser Interface for add-on parsers, avoids the need to create a single, tightly-coupled parser for all types of columns.
ScanLevelProjection.ScanProjectionType Identifies the kind of projection done for this scan.
ScanSchemaOrchestrator Performs projection of a record reader, along with a set of static columns, to produce the final "public" result set (record batch) for the scan operator.
ScanSchemaOrchestrator.ScanOrchestratorBuilder
ScanSchemaOrchestrator.ScanSchemaOptions
SchemaSmoother Implements a "schema smoothing" algorithm.
SchemaSmoother.IncompatibleSchemaException Exception thrown if the prior schema is not compatible with the new table schema.
StaticColumnLoader Base class for columns that take values based on the reader, not individual rows.
VectorSource Generic mechanism for retrieving vectors from a source tuple when projecting columns to the output tuple.