org.apache.calcite.adapter.cassandra

Class CassandraFilter

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.SingleRel

org.apache.calcite.rel.core.Filter

org.apache.calcite.adapter.cassandra.CassandraFilter

All Implemented Interfaces:

Cloneable, CassandraRel, RelOptNode, RelNode

public class CassandraFilter
extends Filter
implements CassandraRel

Implementation of a Filter relational expression in Cassandra.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) static class	CassandraFilter.Translator Translates RexNode expressions into Cassandra expression strings.

Nested classes/interfaces inherited from interface org.apache.calcite.adapter.cassandra.CassandraRel

CassandraRel.Implementor

Field Summary

Fields

Modifier and Type	Field and Description
private List<String>	clusteringKeys
private RelCollation	implicitCollation
private List<RelFieldCollation>	implicitFieldCollations
private String	match
private List<String>	partitionKeys
private Boolean	singlePartition

Fields inherited from class org.apache.calcite.rel.core.Filter

condition

Fields inherited from class org.apache.calcite.rel.SingleRel

input

Fields inherited from class org.apache.calcite.rel.AbstractRelNode

digest, id, rowType, traitSet

Fields inherited from interface org.apache.calcite.adapter.cassandra.CassandraRel

CONVENTION

Constructor Summary

Constructors

Constructor and Description
CassandraFilter(RelOptCluster cluster, RelTraitSet traitSet, RelNode child, RexNode condition, List<String> partitionKeys, List<String> clusteringKeys, List<RelFieldCollation> implicitFieldCollations)

Method Summary

Methods

Modifier and Type	Method and Description
RelOptCost	computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq)
CassandraFilter	copy(RelTraitSet traitSet, RelNode input, RexNode condition)
RelCollation	getImplicitCollation() Get the resulting collation by the clustering keys after filtering.
void	implement(CassandraRel.Implementor implementor)
boolean	isSinglePartition() Check if the filter restricts to a single partition.

Methods inherited from class org.apache.calcite.rel.core.Filter

accept, copy, estimateFilteredRows, estimateFilteredRows, estimateRowCount, explainTerms, getChildExps, getCondition, isValid

Methods inherited from class org.apache.calcite.rel.SingleRel

childrenAccept, deriveRowType, getInput, getInputs, replaceInput

Methods inherited from class org.apache.calcite.rel.AbstractRelNode

accept, collectVariablesSet, collectVariablesUsed, computeDigest, computeSelfCost, explain, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getQuery, getRelTypeName, getRows, getRowType, getTable, getTraitSet, getVariablesSet, getVariablesStopped, isDistinct, isKey, isValid, metadata, onRegister, recomputeDigest, register, sole, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.calcite.rel.RelNode

accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, computeSelfCost, copy, estimateRowCount, explain, getChildExps, getCollationList, getConvention, getCorrelVariable, getExpectedInputRowType, getInput, getInputs, getQuery, getRelTypeName, getRows, getRowType, getTable, getVariablesSet, getVariablesStopped, isDistinct, isKey, isValid, isValid, metadata, onRegister, recomputeDigest, register, replaceInput

Methods inherited from interface org.apache.calcite.plan.RelOptNode

getCluster, getDescription, getDigest, getId, getTraitSet

Field Detail

partitionKeys

private final List<String> partitionKeys

singlePartition

private Boolean singlePartition

clusteringKeys

private final List<String> clusteringKeys

implicitFieldCollations

private List<RelFieldCollation> implicitFieldCollations

implicitCollation

private RelCollation implicitCollation

match

private String match

Constructor Detail

CassandraFilter

public CassandraFilter(RelOptCluster cluster,
               RelTraitSet traitSet,
               RelNode child,
               RexNode condition,
               List<String> partitionKeys,
               List<String> clusteringKeys,
               List<RelFieldCollation> implicitFieldCollations)

Method Detail

computeSelfCost

public RelOptCost computeSelfCost(RelOptPlanner planner,
                         RelMetadataQuery mq)

Specified by:

computeSelfCost in interface RelNode

Overrides:

computeSelfCost in class Filter

copy

public CassandraFilter copy(RelTraitSet traitSet,
                   RelNode input,
                   RexNode condition)

Specified by:

copy in class Filter

implement

public void implement(CassandraRel.Implementor implementor)

Specified by:

implement in interface CassandraRel

isSinglePartition

public boolean isSinglePartition()

Check if the filter restricts to a single partition.

Returns:

True if the filter will restrict the underlying to a single partition

getImplicitCollation

public RelCollation getImplicitCollation()

Get the resulting collation by the clustering keys after filtering.

Returns:

The implicit collation based on the natural sorting by clustering keys