org.apache.druid.sql.calcite.rel

Class DruidRels

java.lang.Object

org.apache.druid.sql.calcite.rel.DruidRels

public class DruidRels
extends Object

Constructor Summary

Constructors

Constructor and Description
DruidRels()

Method Summary

Modifier and Type	Method and Description
static Optional<DruidTable>	druidTableIfLeafRel(DruidRel<?> druidRel) Returns the DataSource involved in a leaf query of class DruidQueryRel.
static boolean	isScanOrMapping(DruidRel<?> druidRel, boolean canBeJoinOrUnion) Check if a druidRel is a simple table scan, or a projection that merely remaps columns without transforming them.

Methods inherited from class java.lang.Object

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

Constructor Detail

DruidRels

public DruidRels()

Method Detail

druidTableIfLeafRel

public static Optional<DruidTable> druidTableIfLeafRel(DruidRel<?> druidRel)

Returns the DataSource involved in a leaf query of class DruidQueryRel.

isScanOrMapping

public static boolean isScanOrMapping(DruidRel<?> druidRel,
                                      boolean canBeJoinOrUnion)

Check if a druidRel is a simple table scan, or a projection that merely remaps columns without transforming them. Like isScanOrProject(org.apache.druid.sql.calcite.rel.DruidRel<?>, boolean) but more restrictive: only remappings are allowed.

Parameters:

druidRel - the rel to check

canBeJoinOrUnion - consider a DruidJoinQueryRel or DruidUnionDataSourceRel as possible scans-and-mappings too.