Package com.apple.foundationdb.record.query.plan.temp.rules

Class OrToUnorderedUnionRule

java.lang.Object

com.apple.foundationdb.record.query.plan.temp.PlannerRule<SelectExpression>

com.apple.foundationdb.record.query.plan.temp.rules.OrToUnorderedUnionRule

@API(EXPERIMENTAL)
public class OrToUnorderedUnionRule
extends PlannerRule<SelectExpression>

Convert a filter on an or expression into a plan on the union. In particular, this will produce a LogicalUnorderedUnionExpression with simple filter plans on each child.

 
     +----------------------------+                 +-----------------------------------+
     |                            |                 |                                   |
     |  SelectExpression          |                 |  LogicalUnorderedUnionExpression  |
     |       p1 v p2 v ... v pn   |                 |                                   |
     |                            |                 +-----------------------------------+
     +-------------+--------------+                        /        |               \
                   |                    +-->              /         |                \
                   | qun                                 /          |                 \
                   |                                    /           |                  \
                   |                                   /            |                   \
                   |                             +--------+    +--------+          +--------+
                   |                             |        |    |        |          |        |
                   |                             |  SEL   |    |  SEL   |          |  SEL   |
                   |                             |    p1' |    |    p2' |   ....   |    pn' |
                   |                             |        |    |        |          |        |
                   |                             +--------+    +--------+          +--------+
                   |                                /              /                   /
                   |                               / qun          / qun               / qun
            +------+------+  ---------------------+              /                   /
            |             |                                     /                   /
            |   any ref   |  ----------------------------------+                   /
            |             |                                                       /
            +-------------+  ----------------------------------------------------+
 
 

Where p1, p2, ..., pn are the or terms of the predicate in the original SelectExpression.

Constructor Summary

Constructors

Constructor	Description
OrToUnorderedUnionRule()

Method Summary

Modifier and Type	Method	Description
void	onMatch(PlannerRuleCall call)

Methods inherited from class com.apple.foundationdb.record.query.plan.temp.PlannerRule

getMatcher, getRootOperator, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

OrToUnorderedUnionRule

public OrToUnorderedUnionRule()

Method Detail

onMatch

public void onMatch(@Nonnull
                    PlannerRuleCall call)

Specified by:

onMatch in class PlannerRule<SelectExpression>