org.apache.calcite.adapter.cassandra

Class CassandraRules.CassandraFilterRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.adapter.cassandra.CassandraRules.CassandraFilterRule

Enclosing class:

CassandraRules

private static class CassandraRules.CassandraFilterRule
extends RelOptRule

Rule to convert a LogicalFilter to a CassandraFilter.

Field Summary

Fields

Modifier and Type	Field and Description
private static CassandraRules.CassandraFilterRule	INSTANCE
private static com.google.common.base.Predicate<LogicalFilter>	PREDICATE

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor and Description
private	CassandraFilterRule()

Method Summary

Modifier and Type	Method and Description
private String	compareFieldWithLiteral(RexNode left, RexNode right, List<String> fieldNames) Check if an equality operation is comparing a primary key column with a literal.
RelNode	convert(LogicalFilter filter, CassandraTableScan scan)
private boolean	isEqualityOnKey(RexNode node, List<String> fieldNames, Set<String> partitionKeys, List<String> clusteringKeys) Check if the node is a supported predicate (primary key equality).
boolean	matches(RelOptRuleCall call)
void	onMatch(RelOptRuleCall call)

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

PREDICATE

private static final com.google.common.base.Predicate<LogicalFilter> PREDICATE

INSTANCE

private static final CassandraRules.CassandraFilterRule INSTANCE

Constructor Detail

CassandraFilterRule

private CassandraFilterRule()

Method Detail

matches

public boolean matches(RelOptRuleCall call)

Overrides:

matches in class RelOptRule

isEqualityOnKey

private boolean isEqualityOnKey(RexNode node,
                                List<String> fieldNames,
                                Set<String> partitionKeys,
                                List<String> clusteringKeys)

Check if the node is a supported predicate (primary key equality).

Parameters:

node - Condition node to check

fieldNames - Names of all columns in the table

partitionKeys - Names of primary key columns

clusteringKeys - Names of primary key columns

Returns:

True if the node represents an equality predicate on a primary key

compareFieldWithLiteral

private String compareFieldWithLiteral(RexNode left,
                                       RexNode right,
                                       List<String> fieldNames)

Check if an equality operation is comparing a primary key column with a literal.

Parameters:

left - Left operand of the equality

right - Right operand of the equality

fieldNames - Names of all columns in the table

Returns:

The field being compared or null if there is no key equality

onMatch

public void onMatch(RelOptRuleCall call)

Specified by:

onMatch in class RelOptRule

See Also:

ConverterRule

convert

public RelNode convert(LogicalFilter filter,
                       CassandraTableScan scan)