org.apache.hadoop.hive.ql.optimizer

Class IndexUtils

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.IndexUtils

public final class IndexUtils
extends Object

Utility class for index support. Currently used for BITMAP and AGGREGATE index

Method Summary

Methods

Modifier and Type	Method and Description
static Set<Partition>	checkPartitionsCoveredByIndex(TableScanOperator tableScan, ParseContext pctx, List<Index> indexes) Check the partitions used by the table scan to make sure they also exist in the index table.
static Task<?>	createRootTask(HiveConf builderConf, Set<ReadEntity> inputs, Set<WriteEntity> outputs, StringBuilder command, LinkedHashMap<String,String> partSpec, String indexTableName, String dbName)
static List<Index>	getAllIndexes(Table table, short max)
static List<Index>	getIndexes(Table baseTableMetaData, List<String> matchIndexTypes) Get a list of indexes on a table that match given types.

Methods inherited from class java.lang.Object

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

Method Detail

checkPartitionsCoveredByIndex

public static Set<Partition> checkPartitionsCoveredByIndex(TableScanOperator tableScan,
                                           ParseContext pctx,
                                           List<Index> indexes)
                                                    throws HiveException

Check the partitions used by the table scan to make sure they also exist in the index table.

Parameters:

pctx -

indexes -

Returns:

partitions used by query. null if they do not exist in index table

Throws:

HiveException

getIndexes

public static List<Index> getIndexes(Table baseTableMetaData,
                     List<String> matchIndexTypes)
                              throws SemanticException

Get a list of indexes on a table that match given types.

Throws:

SemanticException

getAllIndexes

public static List<Index> getAllIndexes(Table table,
                        short max)
                                 throws HiveException

Returns:

List containing Indexes names if there are indexes on this table

Throws:

HiveException

createRootTask

public static Task<?> createRootTask(HiveConf builderConf,
                     Set<ReadEntity> inputs,
                     Set<WriteEntity> outputs,
                     StringBuilder command,
                     LinkedHashMap<String,String> partSpec,
                     String indexTableName,
                     String dbName)