org.apache.hadoop.hive.ql.exec
Class ExplainTask

java.lang.Object
  org.apache.hadoop.hive.ql.exec.Task<ExplainWork>
      org.apache.hadoop.hive.ql.exec.ExplainTask

All Implemented Interfaces:

Serializable, Node

public class ExplainTask
extends Task<ExplainWork>
implements Serializable

ExplainTask implementation.

See Also:

Serialized Form

Nested Class Summary

class

ExplainTask.MethodComparator MethodComparator.

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.Task

Task.FeedType

Field Summary

static String

EXPL_COLUMN_NAME

Fields inherited from class org.apache.hadoop.hive.ql.exec.Task

BACKUP_COMMON_JOIN, backupChildrenTasks, backupTask, childTasks, clonedConf, COMMON_JOIN, conf, console, CONVERTED_MAPJOIN, CONVERTED_MAPJOIN_LOCAL, CONVERTED_SORTMERGEJOIN, db, driverContext, feedSubscribers, HINTED_MAPJOIN, HINTED_MAPJOIN_LOCAL, id, initialized, isdone, jobID, LOG, MAPJOIN_ONLY_NOBACKUP, NO_TAG, parentTasks, queryPlan, queued, rootTask, started, taskCounters, taskHandle, taskTag, work

Constructor Summary

ExplainTask()

Method Summary

int	execute(DriverContext driverContext) This method is overridden in each Task.
org.json.JSONObject	getJSONLogicalPlan(PrintStream out, ExplainWork work)
org.json.JSONObject	getJSONPlan(PrintStream out, ExplainWork work)
org.json.JSONObject	getJSONPlan(PrintStream out, String ast, List<Task<?>> tasks, Task<?> fetchTask, boolean jsonOutput, boolean isExtended, boolean appendTaskType)
String	getName() Gets the name of the node.
List<FieldSchema>	getResultSchema()
StageType	getType() Should be overridden to return the type of the specific task among the types in StageType.
String	outputAST(String treeString, PrintStream out, boolean jsonOutput, int indent)
org.json.JSONObject	outputDependencies(PrintStream out, boolean jsonOutput, boolean appendTaskType, List<Task> tasks)
org.json.JSONObject	outputStagePlans(PrintStream out, List<Task> tasks, boolean jsonOutput, boolean isExtended)

Methods inherited from class org.apache.hadoop.hive.ql.exec.Task

addDependentTask, cloneConf, done, equals, executeTask, getAndInitBackupTask, getBackupChildrenTasks, getBackupTask, getChildren, getChildTasks, getCounters, getDependentTasks, getFeedSubscribers, getId, getInitialized, getJobID, getParentTasks, getQueryPlan, getQueued, getReducer, getTaskHandle, getTaskTag, getTopOperators, getWork, hashCode, hasReduce, ifRetryCmdWhenFail, initialize, isLocalMode, isMapRedLocalTask, isMapRedTask, isRootTask, isRunnable, pushFeed, receiveFeed, removeDependentTask, removeFromChildrenTasks, requireLock, setBackupChildrenTasks, setBackupTask, setChildTasks, setConsole, setDone, setFeedSubscribers, setId, setInitialized, setLocalMode, setParentTasks, setQueryPlan, setQueued, setRetryCmdWhenFail, setRootTask, setStarted, setTaskTag, setWork, shutdown, started, subscribeFeed, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

EXPL_COLUMN_NAME

public static final String EXPL_COLUMN_NAME

See Also:

Constant Field Values

Constructor Detail

ExplainTask

public ExplainTask()

Method Detail

getJSONLogicalPlan

public org.json.JSONObject getJSONLogicalPlan(PrintStream out,
                                              ExplainWork work)
                                       throws Exception

Throws:

Exception

getJSONPlan

public org.json.JSONObject getJSONPlan(PrintStream out,
                                       ExplainWork work)
                                throws Exception

Throws:

Exception

getJSONPlan

public org.json.JSONObject getJSONPlan(PrintStream out,
                                       String ast,
                                       List<Task<?>> tasks,
                                       Task<?> fetchTask,
                                       boolean jsonOutput,
                                       boolean isExtended,
                                       boolean appendTaskType)
                                throws Exception

Throws:

Exception

execute

public int execute(DriverContext driverContext)

Description copied from class: Task

This method is overridden in each Task. TODO execute should return a TaskHandle.

Specified by:

execute in class Task<ExplainWork>

Returns:

status of executing the task

outputAST

public String outputAST(String treeString,
                        PrintStream out,
                        boolean jsonOutput,
                        int indent)
                 throws org.json.JSONException

Throws:

org.json.JSONException

outputDependencies

public org.json.JSONObject outputDependencies(PrintStream out,
                                              boolean jsonOutput,
                                              boolean appendTaskType,
                                              List<Task> tasks)
                                       throws Exception

Throws:

Exception

outputStagePlans

public org.json.JSONObject outputStagePlans(PrintStream out,
                                            List<Task> tasks,
                                            boolean jsonOutput,
                                            boolean isExtended)
                                     throws Exception

Throws:

Exception

getType

public StageType getType()

Description copied from class: Task

Should be overridden to return the type of the specific task among the types in StageType.

Specified by:

getType in class Task<ExplainWork>

Returns:

StageType.* or null if not overridden

getName

public String getName()

Description copied from interface: Node

Gets the name of the node. This is used in the rule dispatchers.

Specified by:

getName in interface Node

Returns:

String

getResultSchema

public List<FieldSchema> getResultSchema()

Overrides:

getResultSchema in class Task<ExplainWork>