Package 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, Hintable, RelNode

public class CassandraFilter
extends Filter
implements CassandraRel

Implementation of a Filter relational expression in Cassandra.

Nested Class Summary

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

CassandraRel.Implementor

Nested classes/interfaces inherited from interface org.apache.calcite.rel.RelNode

RelNode.Context

Field Summary

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

condition, hints

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

Method Summary

Modifier and Type	Method	Description
@Nullable RelOptCost	computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq)	Returns the cost of this plan (not including children).
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, containsOver, copy, deepEquals0, deepHashCode0, estimateFilteredRows, estimateFilteredRows, estimateRowCount, explainTerms, getCondition, getHints, 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, deepEquals, deepHashCode, equals, explain, getCluster, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getRelDigest, getRelTypeName, getRowType, getTable, getTraitSet, getVariablesSet, hashCode, isEnforcer, metadata, onRegister, recomputeDigest, register, sole, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.calcite.rel.hint.Hintable

attachHints, withHints

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

accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, copy, deepEquals, deepHashCode, estimateRowCount, explain, explain, fieldIsNullable, getConvention, getCorrelVariable, getDigest, getExpectedInputRowType, getInput, getInputs, getRelDigest, getRelTypeName, getRowType, getTable, getVariablesSet, isEnforcer, isValid, metadata, onRegister, recomputeDigest, register, replaceInput, stripped

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

getCluster, getDescription, getId, getTraitSet

Constructor Details

CassandraFilter

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

Method Details

computeSelfCost

public @Nullable RelOptCost computeSelfCost(RelOptPlanner planner,
 RelMetadataQuery mq)

Description copied from interface: RelNode

Returns the cost of this plan (not including children). The base implementation throws an error; derived classes should override.

NOTE jvs 29-Mar-2006: Don't call this method directly. Instead, use RelMetadataQuery.getNonCumulativeCost(org.apache.calcite.rel.RelNode), which gives plugins a chance to override the rel's default ideas about cost.

Specified by:

computeSelfCost in interface RelNode

Overrides:

computeSelfCost in class Filter

Parameters:

planner - Planner for cost calculation

mq - Metadata query

Returns:

Cost of this plan (not including children)

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