org.apache.ignite.internal.processors.query.h2.sql

Class GridSqlQuerySplitter

java.lang.Object

org.apache.ignite.internal.processors.query.h2.sql.GridSqlQuerySplitter

public class GridSqlQuerySplitter
extends Object

Splits a single SQL query into two step map-reduce query.

Constructor Summary

Constructors

Constructor and Description
GridSqlQuerySplitter(int paramsCnt, boolean collocatedGrpBy, boolean distributedJoins, boolean locSplit, PartitionExtractor extractor, IgniteLogger log)

Method Summary

Modifier and Type	Method and Description
static GridSqlAlias	keyColumn(GridSqlSelect sel) Retrieves _KEY column from SELECT.
static String	mergeTableIdentifier(int idx)
static GridCacheTwoStepQuery	split(H2PooledConnection conn, GridSqlQuery qry, String originalSql, boolean collocatedGrpBy, boolean distributedJoins, boolean enforceJoinOrder, boolean locSplit, IgniteH2Indexing idx, int paramsCnt, IgniteLogger log)

Methods inherited from class java.lang.Object

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

Constructor Detail

GridSqlQuerySplitter

public GridSqlQuerySplitter(int paramsCnt,
                            boolean collocatedGrpBy,
                            boolean distributedJoins,
                            boolean locSplit,
                            PartitionExtractor extractor,
                            IgniteLogger log)

Parameters:

paramsCnt - Parameters count.

collocatedGrpBy - If it is a collocated GROUP BY query.

distributedJoins - Distributed joins flag.

locSplit - Local split flag.

extractor - Partition extractor.

Method Detail

mergeTableIdentifier

public static String mergeTableIdentifier(int idx)

Parameters:

idx - Table index.

Returns:

Merge table name.

split

public static GridCacheTwoStepQuery split(H2PooledConnection conn,
                                          GridSqlQuery qry,
                                          String originalSql,
                                          boolean collocatedGrpBy,
                                          boolean distributedJoins,
                                          boolean enforceJoinOrder,
                                          boolean locSplit,
                                          IgniteH2Indexing idx,
                                          int paramsCnt,
                                          IgniteLogger log)
                                   throws SQLException,
                                          IgniteCheckedException

Parameters:

conn - Connection.

qry - Query.

originalSql - Original SQL query string.

collocatedGrpBy - Whether the query has collocated GROUP BY keys.

distributedJoins - If distributed joins enabled.

enforceJoinOrder - Enforce join order.

locSplit - Whether this is a split for local query.

idx - Indexing.

paramsCnt - Parameters count.

Returns:

Two step query.

Throws:

SQLException - If failed.

IgniteCheckedException - If failed.

keyColumn

public static GridSqlAlias keyColumn(GridSqlSelect sel)

Retrieves _KEY column from SELECT. This column is used for SELECT FOR UPDATE statements.

Parameters:

sel - Select statement.

Returns:

Key column alias.