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

Class HiveMaterializedViewASTSubQueryRewriteShuttle

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.calcite.HiveRelShuttleImpl

org.apache.hadoop.hive.ql.optimizer.calcite.HiveMaterializedViewASTSubQueryRewriteShuttle

All Implemented Interfaces:

org.apache.calcite.rel.RelShuttle, HiveRelShuttle

public class HiveMaterializedViewASTSubQueryRewriteShuttle
extends HiveRelShuttleImpl

Traverse the plan and tries to rewrite subtrees of the plan to materialized view scans. The rewrite depends on whether the subtree's corresponding AST match with any materialized view definitions AST.

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.optimizer.calcite.HiveRelShuttleImpl

stack

Constructor Summary

Constructors

Constructor and Description
HiveMaterializedViewASTSubQueryRewriteShuttle(Map<org.apache.calcite.rel.RelNode,ASTNode> subQueryMap, ASTNode originalAST, ASTNode expandedAST, org.apache.calcite.tools.RelBuilder relBuilder, Hive db, Set<TableName> tablesUsedByOriginalPlan, HiveTxnManager txnManager)

Method Summary

Modifier and Type	Method and Description
static org.apache.calcite.rel.RelNode	getMaterializedViewByAST(ASTNode expandedAST, org.apache.calcite.plan.RelOptCluster optCluster, Predicate<Set<RewriteAlgorithm>> filter, Hive db, Set<TableName> tablesUsedByOriginalPlan, HiveTxnManager txnManager) 1.
org.apache.calcite.rel.RelNode	rewrite(org.apache.calcite.rel.RelNode relNode)
org.apache.calcite.rel.RelNode	visit(HiveFilter filter)
org.apache.calcite.rel.RelNode	visit(HiveProject project)

Methods inherited from class org.apache.hadoop.hive.ql.optimizer.calcite.HiveRelShuttleImpl

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visitChild, visitChildren

Methods inherited from class java.lang.Object

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

Constructor Detail

HiveMaterializedViewASTSubQueryRewriteShuttle

public HiveMaterializedViewASTSubQueryRewriteShuttle(Map<org.apache.calcite.rel.RelNode,ASTNode> subQueryMap,
                                                     ASTNode originalAST,
                                                     ASTNode expandedAST,
                                                     org.apache.calcite.tools.RelBuilder relBuilder,
                                                     Hive db,
                                                     Set<TableName> tablesUsedByOriginalPlan,
                                                     HiveTxnManager txnManager)

Method Detail

rewrite

public org.apache.calcite.rel.RelNode rewrite(org.apache.calcite.rel.RelNode relNode)

visit

public org.apache.calcite.rel.RelNode visit(HiveProject project)

Specified by:

visit in interface HiveRelShuttle

Overrides:

visit in class HiveRelShuttleImpl

visit

public org.apache.calcite.rel.RelNode visit(HiveFilter filter)

Specified by:

visit in interface HiveRelShuttle

Overrides:

visit in class HiveRelShuttleImpl

getMaterializedViewByAST

public static org.apache.calcite.rel.RelNode getMaterializedViewByAST(ASTNode expandedAST,
                                                                      org.apache.calcite.plan.RelOptCluster optCluster,
                                                                      Predicate<Set<RewriteAlgorithm>> filter,
                                                                      Hive db,
                                                                      Set<TableName> tablesUsedByOriginalPlan,
                                                                      HiveTxnManager txnManager)

1. Look up MVs in the registry by AST 2. Check if we have the correct privilege to scan those MVs 3. Validate if they are up-to-date