Class Constraint

java.lang.Object

io.trino.spi.connector.Constraint

public class Constraint
extends Object

Constructor Summary

Constructors

Constructor	Description
Constraint(TupleDomain<ColumnHandle> summary)
Constraint(TupleDomain<ColumnHandle> summary, ConnectorExpression expression, Map<String,ColumnHandle> assignments)
Constraint(TupleDomain<ColumnHandle> summary, ConnectorExpression expression, Map<String,ColumnHandle> assignments, Predicate<Map<ColumnHandle,NullableValue>> predicate, Set<ColumnHandle> predicateColumns)
Constraint(TupleDomain<ColumnHandle> summary, Predicate<Map<ColumnHandle,NullableValue>> predicate, Set<ColumnHandle> predicateColumns)

Method Summary

Modifier and Type	Method	Description
static Constraint	alwaysFalse()
static Constraint	alwaysTrue()
Map<String,ColumnHandle>	getAssignments()
ConnectorExpression	getExpression()
Optional<Set<ColumnHandle>>	getPredicateColumns()	Set of columns the predicate() result depends on.
TupleDomain<ColumnHandle>	getSummary()
Optional<Predicate<Map<ColumnHandle,NullableValue>>>	predicate()	A predicate that can be used to filter data.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

Constraint

public Constraint(TupleDomain<ColumnHandle> summary)

Constraint

public Constraint(TupleDomain<ColumnHandle> summary,
 Predicate<Map<ColumnHandle,NullableValue>> predicate,
 Set<ColumnHandle> predicateColumns)

Constraint

public Constraint(TupleDomain<ColumnHandle> summary,
 ConnectorExpression expression,
 Map<String,ColumnHandle> assignments)

Constraint

public Constraint(TupleDomain<ColumnHandle> summary,
 ConnectorExpression expression,
 Map<String,ColumnHandle> assignments,
 Predicate<Map<ColumnHandle,NullableValue>> predicate,
 Set<ColumnHandle> predicateColumns)

Method Details

alwaysTrue

public static Constraint alwaysTrue()

alwaysFalse

public static Constraint alwaysFalse()

getSummary

public TupleDomain<ColumnHandle> getSummary()

Returns:

a predicate which is equivalent to, or looser than predicate (if present), and should be AND-ed with, getExpression().

getExpression

public ConnectorExpression getExpression()

Returns:

an expression predicate which is different from, and should be AND-ed with, getSummary() or predicate (if present).

getAssignments

public Map<String,ColumnHandle> getAssignments()

Returns:

mappings from variable names to table column handles It is guaranteed that all the required mappings for getExpression() will be provided but not necessarily *all* the column handles of the table

predicate

public Optional<Predicate<Map<ColumnHandle,NullableValue>>> predicate()

A predicate that can be used to filter data. If present, it is equivalent to, or stricter than, getSummary() and different from, and should be AND-ed with, getExpression().

For Constraint provided in ConnectorMetadata.applyFilter(ConnectorSession, ConnectorTableHandle, Constraint), the predicate cannot be held on to after the call returns.

See Also:

• getPredicateColumns()

getPredicateColumns

public Optional<Set<ColumnHandle>> getPredicateColumns()

Set of columns the predicate() result depends on. It's present if and only if predicate() is present.

toString

public String toString()

Overrides:

toString in class Object