org.apache.pig.newplan.logical

Class Util

java.lang.Object

org.apache.pig.newplan.logical.Util

public class Util
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
Util()

Method Summary

Modifier and Type	Method and Description
static LOForEach	addForEachAfter(LogicalPlan plan, LogicalRelationalOperator op, int branch, java.util.Set<java.lang.Integer> columnsToDrop)
static Schema	fixSchemaAddTupleInBag(Schema sch) If schema argument has fields where a bag does not contain a tuple schema, it inserts a tuple schema.
static <C extends LogicalRelationalOperator> java.util.LinkedList<C>	getLogicalRelationalOperators(LogicalPlan plan, java.lang.Class<C> opClass) Returns a LinkedList of operators contained within the physical plan which implement the supplied class, in dependency order.
static Schema.FieldSchema	translateFieldSchema(LogicalSchema.LogicalFieldSchema fs)
static LogicalSchema.LogicalFieldSchema	translateFieldSchema(Schema.FieldSchema fs)
static Schema	translateSchema(LogicalSchema schema) This function translates the new LogicalSchema into old Schema format required by PhysicalOperators
static LogicalSchema	translateSchema(Schema schema)

Methods inherited from class java.lang.Object

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

Constructor Detail

Util

public Util()

Method Detail

translateSchema

public static LogicalSchema translateSchema(Schema schema)

translateFieldSchema

public static LogicalSchema.LogicalFieldSchema translateFieldSchema(Schema.FieldSchema fs)

translateSchema

public static Schema translateSchema(LogicalSchema schema)

This function translates the new LogicalSchema into old Schema format required by PhysicalOperators

Parameters:

schema - LogicalSchema to be converted to Schema

Returns:

Schema that is converted from LogicalSchema

Throws:

FrontendException

fixSchemaAddTupleInBag

public static Schema fixSchemaAddTupleInBag(Schema sch)
                                     throws FrontendException

If schema argument has fields where a bag does not contain a tuple schema, it inserts a tuple schema. It does so for all inner levels. eg bag({int}) => bag({(int)})

Parameters:

sch -

Returns:

modified schema

Throws:

FrontendException

translateFieldSchema

public static Schema.FieldSchema translateFieldSchema(LogicalSchema.LogicalFieldSchema fs)

addForEachAfter

public static LOForEach addForEachAfter(LogicalPlan plan,
                                        LogicalRelationalOperator op,
                                        int branch,
                                        java.util.Set<java.lang.Integer> columnsToDrop)
                                 throws FrontendException

Throws:

FrontendException

getLogicalRelationalOperators

public static <C extends LogicalRelationalOperator> java.util.LinkedList<C> getLogicalRelationalOperators(LogicalPlan plan,
                                                                                                          java.lang.Class<C> opClass)
                                                                                                   throws FrontendException

Returns a LinkedList of operators contained within the physical plan which implement the supplied class, in dependency order. Returns an empty LinkedList of no such operators exist.

Parameters:

plan -

opClass -

Returns:

a LinkedList of operators contained within the plan which implement the supplied class; empty if no such ops exist.

Throws:

FrontendException