org.apache.calcite.adapter.cassandra

Class CassandraRules.CassandraSortRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.adapter.cassandra.CassandraRules.CassandraSortRule

Enclosing class:

CassandraRules

private static class CassandraRules.CassandraSortRule
extends RelOptRule

Rule to convert a Sort to a CassandraSort.

Field Summary

Fields

Modifier and Type	Field and Description
private static RelOptRuleOperand	CASSANDRA_OP
private static com.google.common.base.Predicate<CassandraFilter>	FILTER_PREDICATE
private static CassandraRules.CassandraSortRule	INSTANCE
private static com.google.common.base.Predicate<Sort>	SORT_PREDICATE

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor and Description
private	CassandraSortRule()

Method Summary

Modifier and Type	Method and Description
private boolean	collationsCompatible(RelCollation sortCollation, RelCollation implicitCollation) Check if it is possible to exploit native CQL sorting for a given collation.
RelNode	convert(Sort sort, CassandraFilter filter)
boolean	matches(RelOptRuleCall call)
void	onMatch(RelOptRuleCall call)
private RelFieldCollation.Direction	reverseDirection(RelFieldCollation.Direction direction) Find the reverse of a given collation direction.

Methods inherited from class org.apache.calcite.plan.RelOptRule

any, convert, convert, convertList, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, none, operand, operand, operand, operand, operand, some, toString, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

SORT_PREDICATE

private static final com.google.common.base.Predicate<Sort> SORT_PREDICATE

FILTER_PREDICATE

private static final com.google.common.base.Predicate<CassandraFilter> FILTER_PREDICATE

CASSANDRA_OP

private static final RelOptRuleOperand CASSANDRA_OP

INSTANCE

private static final CassandraRules.CassandraSortRule INSTANCE

Constructor Detail

CassandraSortRule

private CassandraSortRule()

Method Detail

convert

public RelNode convert(Sort sort,
                       CassandraFilter filter)

matches

public boolean matches(RelOptRuleCall call)

Overrides:

matches in class RelOptRule

collationsCompatible

private boolean collationsCompatible(RelCollation sortCollation,
                                     RelCollation implicitCollation)

Check if it is possible to exploit native CQL sorting for a given collation.

Returns:

True if it is possible to achieve this sort in Cassandra

reverseDirection

private RelFieldCollation.Direction reverseDirection(RelFieldCollation.Direction direction)

Find the reverse of a given collation direction.

Returns:

Reverse of the input direction

onMatch

public void onMatch(RelOptRuleCall call)

Specified by:

onMatch in class RelOptRule

See Also:

ConverterRule