org.apache.flink.table.planner.functions.casting

Class CastRulePredicate

java.lang.Object

org.apache.flink.table.planner.functions.casting.CastRulePredicate

@Internal
public class CastRulePredicate
extends Object

In order to apply a CastRule, the runtime checks if a particular rule matches the tuple of input and target type using this class. In particular, a rule is applied if:

1. getTargetTypeRoots() includes the LogicalTypeRoot of target type and either
   1. getInputTypeRoots() includes the LogicalTypeRoot of input type or
   2. getInputTypeFamilies() includes one of the LogicalTypeFamily of input type
2. Or getTargetTypeFamilies() includes one of the LogicalTypeFamily of target type and either
   1. getInputTypeRoots() includes the LogicalTypeRoot of input type or
   2. getInputTypeFamilies() includes one of the LogicalTypeFamily of input type
3. Or, if getCustomPredicate() is not null, the input LogicalType and target LogicalType matches the predicate.

The customPredicate should be used in cases where LogicalTypeRoot and LogicalTypeFamily are not enough to identify whether a rule is applicable or not, for example when the matching depends on a field of the provided input LogicalType instance.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CastRulePredicate.Builder Builder for the CastRulePredicate.

Method Summary

Modifier and Type	Method and Description
static CastRulePredicate.Builder	builder()
Optional<BiPredicate<LogicalType,LogicalType>>	getCustomPredicate()
Set<LogicalTypeFamily>	getInputTypeFamilies()
Set<LogicalTypeRoot>	getInputTypeRoots()
Set<LogicalTypeFamily>	getTargetTypeFamilies()
Set<LogicalTypeRoot>	getTargetTypeRoots()
Set<LogicalType>	getTargetTypes()

Methods inherited from class java.lang.Object

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

Method Detail

getTargetTypes

public Set<LogicalType> getTargetTypes()

getInputTypeRoots

public Set<LogicalTypeRoot> getInputTypeRoots()

getTargetTypeRoots

public Set<LogicalTypeRoot> getTargetTypeRoots()

getInputTypeFamilies

public Set<LogicalTypeFamily> getInputTypeFamilies()

getTargetTypeFamilies

public Set<LogicalTypeFamily> getTargetTypeFamilies()

getCustomPredicate

public Optional<BiPredicate<LogicalType,LogicalType>> getCustomPredicate()

builder

public static CastRulePredicate.Builder builder()