Collaboration diagram for com.cloudera.impala.analysis.TupleDescriptor:

Public Member Functions
	TupleDescriptor (TupleId id, String debugName)

void	addSlot (SlotDescriptor desc)

TupleId	getId ()

ArrayList< SlotDescriptor >	getSlots ()

Table	getTable ()

TableName	getTableName ()

void	setPath (Path p)

Path	getPath ()

void	setType (StructType type)

StructType	getType ()

int	getByteSize ()

float	getAvgSerializedSize ()

boolean	isMaterialized ()

void	setIsMaterialized (boolean value)

void	setAliases (String[] aliases, boolean hasExplicitAlias)

boolean	hasExplicitAlias ()

String	getAlias ()

TableName	getAliasAsName ()

String	debugString ()

void	materializeSlots ()

TTupleDescriptor	toThrift ()

void	computeMemLayout ()

boolean	isCompatible (TupleDescriptor desc)

Private Attributes
final TupleId	id_

final String	debugName_

final ArrayList< SlotDescriptor >	slots_ = Lists.newArrayList()

Path	path_

StructType	type_

String[]	aliases_

boolean	hasExplicitAlias_

boolean	isMaterialized_ = true

boolean	hasMemLayout_ = false

int	byteSize_

int	numNullBytes_

float	avgSerializedSize_

Detailed Description

A collection of slots that are organized in a CPU-friendly memory layout. A slot is a typed placeholder for a single value operated on at runtime. A slot can be named or anonymous. A named slot corresponds directly to a column or field that can be directly referenced in a query by its name. An anonymous slot represents an intermediate value produced during query execution, e.g., aggregation output. A tuple descriptor has an associated type and a list of slots. Its type is a struct that contains as its fields the list of all named slots covered by this tuple. The list of slots tracks the named slots that are actually referenced in a query, as well as all anonymous slots. Although not required, a tuple descriptor typically only has named or anonymous slots and not a mix of both.

For example, every table reference has a corresponding tuple descriptor. The columns of the table are represented by the tuple descriptor's type (struct type with one field per column). The list of slots tracks which of the table's columns are actually referenced. A similar explanation applies for collection references.

A tuple descriptor may be materialized or non-materialized. A non-materialized tuple descriptor acts as a placeholder for 'virtual' table references such as inline views, and must not be materialized at runtime.

Definition at line 54 of file TupleDescriptor.java.

Constructor & Destructor Documentation

com.cloudera.impala.analysis.TupleDescriptor.TupleDescriptor	(	TupleId	id,
		String	debugName
	)

inline

Definition at line 84 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.debugName_, com.cloudera.impala.analysis.TupleDescriptor.id_, and com.cloudera.impala.analysis.TupleDescriptor.path_.

Member Function Documentation

void com.cloudera.impala.analysis.TupleDescriptor.addSlot ( SlotDescriptor desc )

inline

Definition at line 90 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.hasMemLayout_.

void com.cloudera.impala.analysis.TupleDescriptor.computeMemLayout ( )

inline

Definition at line 173 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.avgSerializedSize_, com.cloudera.impala.analysis.TupleDescriptor.getAvgSerializedSize(), com.cloudera.impala.catalog.ColumnStats.hasAvgSerializedSize(), com.cloudera.impala.analysis.TupleDescriptor.hasMemLayout_, com.cloudera.impala.analysis.TupleDescriptor.numNullBytes_, offset, and com.cloudera.impala.analysis.TupleDescriptor.slots_.

String com.cloudera.impala.analysis.TupleDescriptor.debugString ( )

inline

Definition at line 136 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.byteSize_, com.cloudera.impala.analysis.TupleDescriptor.debugName_, com.cloudera.impala.analysis.TupleDescriptor.getTable(), com.cloudera.impala.analysis.TupleDescriptor.id_, com.cloudera.impala.analysis.TupleDescriptor.isMaterialized_, and com.cloudera.impala.analysis.TupleDescriptor.slots_.

String com.cloudera.impala.analysis.TupleDescriptor.getAlias ( )

inline

Definition at line 131 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.aliases_.

Referenced by com.cloudera.impala.planner.DataSourceScanNode.getNodeExplainString(), and com.cloudera.impala.planner.HBaseScanNode.getNodeExplainString().

TableName com.cloudera.impala.analysis.TupleDescriptor.getAliasAsName ( )

inline

Definition at line 132 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.aliases_.

float com.cloudera.impala.analysis.TupleDescriptor.getAvgSerializedSize ( )

inline

Definition at line 123 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.avgSerializedSize_.

Referenced by com.cloudera.impala.analysis.TupleDescriptor.computeMemLayout().

int com.cloudera.impala.analysis.TupleDescriptor.getByteSize ( )

inline

Definition at line 122 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.byteSize_.

Referenced by com.cloudera.impala.planner.AnalyticPlanner.SortGroup.SizeLt.compare(), and com.cloudera.impala.analysis.DescriptorTable.copyTupleDescriptor().

TupleId com.cloudera.impala.analysis.TupleDescriptor.getId ( )

inline

Definition at line 95 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.id_.

Referenced by com.cloudera.impala.planner.ScanNode.debugString(), com.cloudera.impala.planner.AnalyticEvalNode.debugString(), com.cloudera.impala.planner.HBaseScanNode.debugString(), com.cloudera.impala.planner.DataSourceScanNode.debugString(), com.cloudera.impala.planner.ScanNode.ScanNode(), com.cloudera.impala.planner.HBaseScanNode.toThrift(), com.cloudera.impala.planner.DataSourceScanNode.toThrift(), and com.cloudera.impala.planner.HdfsScanNode.toThrift().

Path com.cloudera.impala.analysis.TupleDescriptor.getPath ( )

inline

Definition at line 119 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.path_.

Referenced by com.cloudera.impala.analysis.SlotDescriptor.getAbsolutePath().

ArrayList<SlotDescriptor> com.cloudera.impala.analysis.TupleDescriptor.getSlots ( )

inline

Definition at line 96 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.slots_.

Table com.cloudera.impala.analysis.TupleDescriptor.getTable ( )

inline

Definition at line 97 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.path_.

TableName com.cloudera.impala.analysis.TupleDescriptor.getTableName ( )

inline

Definition at line 101 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.getTable().

StructType com.cloudera.impala.analysis.TupleDescriptor.getType ( )

inline

Definition at line 121 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.type_.

boolean com.cloudera.impala.analysis.TupleDescriptor.hasExplicitAlias ( )

inline

Definition at line 130 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.hasExplicitAlias_.

Referenced by com.cloudera.impala.planner.HdfsScanNode.getDisplayLabelDetail(), com.cloudera.impala.analysis.Analyzer.registerTableRef(), and com.cloudera.impala.analysis.TupleDescriptor.setAliases().

boolean com.cloudera.impala.analysis.TupleDescriptor.isCompatible ( TupleDescriptor desc )

inline

Returns true if tuples of type 'this' can be assigned to tuples of type 'desc' (checks that both have the same number of slots and that slots are of the same type)

Definition at line 248 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.slots_.

boolean com.cloudera.impala.analysis.TupleDescriptor.isMaterialized ( )

inline

Definition at line 124 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.isMaterialized_.

void com.cloudera.impala.analysis.TupleDescriptor.materializeSlots ( )

inline

Materialize all slots.

Definition at line 155 of file TupleDescriptor.java.

References com.cloudera.impala.analysis.TupleDescriptor.slots_.