org.apache.pig.impl.logicalLayer
Class LOLoad

java.lang.Object
  extended by org.apache.pig.impl.plan.Operator<LOVisitor>
      extended by org.apache.pig.impl.logicalLayer.LogicalOperator
          extended by org.apache.pig.impl.logicalLayer.LOLoad
All Implemented Interfaces:
Serializable, Cloneable, Comparable<Operator>

public class LOLoad
extends LogicalOperator

See Also:
Serialized Form

Field Summary
protected  boolean splittable
           
 
Fields inherited from class org.apache.pig.impl.logicalLayer.LogicalOperator
mAlias, mIsSchemaComputed, mPlan, mRequestedParallelism, mSchema, mType
 
Fields inherited from class org.apache.pig.impl.plan.Operator
mKey
 
Constructor Summary
LOLoad(LogicalPlan plan, OperatorKey key, FileSpec inputFileSpec, ExecType execType, DataStorage storage, boolean splittable)
           
 
Method Summary
 Schema getDeterminedSchema()
           
 Schema getEnforcedSchema()
           
 FileSpec getInputFile()
           
 LoadFunc getLoadFunc()
           
 ProjectionMap getProjectionMap()
          Produce a map describing how this operator modifies its projection.
 List<RequiredFields> getRequiredFields()
          Get a list of fields that this operator requires.
 Schema getSchema()
          Get a copy of the schema for the output of this operator.
 String getSchemaFile()
           
 byte getType()
          Get the type of this operator.
 boolean isSplittable()
           
 String name()
           
 void setEnforcedSchema(Schema enforcedSchema)
          Set this when user enforces schema
 void setInputFile(FileSpec inputFileSpec)
           
 void setSchema(Schema schema)
          Set the output schema for this operator.
 boolean supportsMultipleInputs()
          Indicates whether this operator supports multiple inputs.
 void visit(LOVisitor v)
          Visit this node with the provided visitor.
 
Methods inherited from class org.apache.pig.impl.logicalLayer.LogicalOperator
clone, forceSchema, getAlias, getOperatorKey, getPlan, getRequestedParallelism, reconcileSchema, regenerateSchema, setAlias, setCanonicalNames, setPlan, setRequestedParallelism, setSchemaComputed, setType, supportsMultipleOutputs, toString, unsetSchema
 
Methods inherited from class org.apache.pig.impl.plan.Operator
compareTo, equals, hashCode
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

splittable

protected boolean splittable
Constructor Detail

LOLoad

public LOLoad(LogicalPlan plan,
              OperatorKey key,
              FileSpec inputFileSpec,
              ExecType execType,
              DataStorage storage,
              boolean splittable)
       throws IOException
Parameters:
plan - LogicalPlan this operator is a part of.
key - OperatorKey for this operator
inputFileSpec - the file to be loaded *
execType - the execution mode @see org.apache.pig.ExecType
storage - the underlying storage
splittable - if the input file is splittable (.gz is not)
Throws:
IOException
Method Detail

getInputFile

public FileSpec getInputFile()

setInputFile

public void setInputFile(FileSpec inputFileSpec)
                  throws IOException
Throws:
IOException

getSchemaFile

public String getSchemaFile()

getLoadFunc

public LoadFunc getLoadFunc()

name

public String name()
Specified by:
name in class Operator<LOVisitor>

getSchema

public Schema getSchema()
                 throws FrontendException
Description copied from class: LogicalOperator
Get a copy of the schema for the output of this operator.

Specified by:
getSchema in class LogicalOperator
Throws:
FrontendException

setSchema

public void setSchema(Schema schema)
               throws FrontendException
Description copied from class: LogicalOperator
Set the output schema for this operator. If a schema already exists, an attempt will be made to reconcile it with this new schema.

Overrides:
setSchema in class LogicalOperator
Parameters:
schema - Schema to set.
Throws:
FrontendException

supportsMultipleInputs

public boolean supportsMultipleInputs()
Description copied from class: Operator
Indicates whether this operator supports multiple inputs.

Specified by:
supportsMultipleInputs in class Operator<LOVisitor>
Returns:
true if it does, otherwise false.

visit

public void visit(LOVisitor v)
           throws VisitorException
Description copied from class: LogicalOperator
Visit this node with the provided visitor. This should only be called by the visitor class itself, never directly.

Specified by:
visit in class LogicalOperator
Parameters:
v - Visitor to visit with.
Throws:
VisitorException - if the visitor has a problem.

getEnforcedSchema

public Schema getEnforcedSchema()

setEnforcedSchema

public void setEnforcedSchema(Schema enforcedSchema)
Set this when user enforces schema

Parameters:
enforcedSchema -

isSplittable

public boolean isSplittable()

getType

public byte getType()
Description copied from class: LogicalOperator
Get the type of this operator.

Overrides:
getType in class LogicalOperator

getDeterminedSchema

public Schema getDeterminedSchema()
Returns:
the DeterminedSchema

getProjectionMap

public ProjectionMap getProjectionMap()
Description copied from class: LogicalOperator
Produce a map describing how this operator modifies its projection.

Overrides:
getProjectionMap in class LogicalOperator
Returns:
ProjectionMap null indicates it does not know how the projection changes, for example a join of two inputs where one input does not have a schema.

getRequiredFields

public List<RequiredFields> getRequiredFields()
Description copied from class: LogicalOperator
Get a list of fields that this operator requires. This is not necessarily equivalent to the list of fields the operator projects. For example, a filter will project anything passed to it, but requires only the fields explicitly referenced in its filter expression.

Overrides:
getRequiredFields in class LogicalOperator
Returns:
list of RequiredFields null indicates that the operator does not need any fields from its input.


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