org.apache.hadoop.hive.ql.optimizer.calcite.rules.views

Class HiveMaterializedViewUtils

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.calcite.rules.views.HiveMaterializedViewUtils

public class HiveMaterializedViewUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static HiveRelOptMaterialization	augmentMaterializationWithTimeInformation(HiveRelOptMaterialization materialization, String validTxnsList, MaterializationSnapshot snapshot) Method to enrich the materialization query contained in the input with its invalidation.
static boolean	checkPrivilegeForMaterializedViews(List<Table> cachedMVTableList) Validate if given materialized view has SELECT privileges for current user
static org.apache.calcite.rel.RelNode	copyNodeNewCluster(org.apache.calcite.plan.RelOptCluster optCluster, org.apache.calcite.rel.RelNode node) Method that will recreate the plan rooted at node using the cluster given as a parameter.
static List<HiveRelOptMaterialization>	deriveGroupingSetsMaterializedViews(HiveRelOptMaterialization materialization) If a materialization does not contain grouping sets, it returns the materialization itself.
static Table	extractTable(org.apache.calcite.plan.RelOptMaterialization materialization)
static MaterializationSnapshot	getSnapshotOf(DDLOperationContext context, Set<TableName> tables)
static Boolean	isOutdatedMaterializedView(String validTxnsList, HiveTxnManager txnMgr, Hive db, Set<TableName> tablesUsed, Table materializedViewTable) Utility method that returns whether a materialized view is outdated (true), not outdated (false), or it cannot be determined (null).

Methods inherited from class java.lang.Object

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

Method Detail

extractTable

public static Table extractTable(org.apache.calcite.plan.RelOptMaterialization materialization)

isOutdatedMaterializedView

public static Boolean isOutdatedMaterializedView(String validTxnsList,
                                                 HiveTxnManager txnMgr,
                                                 Hive db,
                                                 Set<TableName> tablesUsed,
                                                 Table materializedViewTable)
                                          throws HiveException

Utility method that returns whether a materialized view is outdated (true), not outdated (false), or it cannot be determined (null). The latest case may happen e.g. when the materialized view definition uses external tables.

Throws:

HiveException

augmentMaterializationWithTimeInformation

public static HiveRelOptMaterialization augmentMaterializationWithTimeInformation(HiveRelOptMaterialization materialization,
                                                                                  String validTxnsList,
                                                                                  MaterializationSnapshot snapshot)
                                                                           throws LockException

Method to enrich the materialization query contained in the input with its invalidation.

Throws:

LockException

deriveGroupingSetsMaterializedViews

public static List<HiveRelOptMaterialization> deriveGroupingSetsMaterializedViews(HiveRelOptMaterialization materialization)

If a materialization does not contain grouping sets, it returns the materialization itself. Otherwise, it will create one materialization for each grouping set. For each grouping set, the query for the materialization will consist of the group by columns in the grouping set, followed by a projection to recreate the literal null values. The view scan will consist of the scan over the materialization followed by a filter on the grouping id value corresponding to that grouping set.

copyNodeNewCluster

public static org.apache.calcite.rel.RelNode copyNodeNewCluster(org.apache.calcite.plan.RelOptCluster optCluster,
                                                                org.apache.calcite.rel.RelNode node)

Method that will recreate the plan rooted at node using the cluster given as a parameter.

checkPrivilegeForMaterializedViews

public static boolean checkPrivilegeForMaterializedViews(List<Table> cachedMVTableList)
                                                  throws HiveException

Validate if given materialized view has SELECT privileges for current user

Parameters:

cachedMVTableList -

Returns:

false if user does not have privilege otherwise true

Throws:

HiveException

getSnapshotOf

public static MaterializationSnapshot getSnapshotOf(DDLOperationContext context,
                                                    Set<TableName> tables)
                                             throws HiveException

Throws:

HiveException