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

static Set<Partition>	checkPartitionsCoveredByIndex(TableScanOperator tableScan, ParseContext pctx, Map<Table,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>	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,
                                                           Map<Table,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

createRootTask

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