Package org.apache.calcite.rel.core

Class Union

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.core.SetOp

org.apache.calcite.rel.core.Union

All Implemented Interfaces:

Cloneable, RelOptNode, RelNode

Direct Known Subclasses:

Bindables.BindableUnion, EnumerableUnion, JdbcRules.JdbcUnion, LogicalUnion

public abstract class Union
extends SetOp

Relational expression that returns the union of the rows of its inputs, optionally eliminating duplicates.

Corresponds to SQL UNION and UNION ALL.

Nested Class Summary

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

RelNode.Context

Field Summary

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

all, inputs, kind

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

digest, id, rowType, traitSet

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Union(RelOptCluster cluster, RelTraitSet traits, List<RelNode> inputs, boolean all)
protected	Union(RelInput input)	Creates a Union by parsing serialized output.

Method Summary

Modifier and Type	Method	Description
double	estimateRowCount(RelMetadataQuery mq)	Returns an estimate of the number of rows this relational expression will return.
static double	estimateRowCount(RelNode rel)	Deprecated.

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

copy, copy, deriveRowType, explainTerms, getInputs, isHomogeneous, replaceInput

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

accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, computeSelfCost, deepEquals, deepHashCode, equals, explain, getCluster, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getRelDigest, getRelTypeName, getRowType, getTable, getTraitSet, getVariablesSet, hashCode, isEnforcer, isValid, 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.RelNode

explain

Constructor Details

Union

protected Union(RelOptCluster cluster, RelTraitSet traits, List<RelNode> inputs, boolean all)

Union

protected Union(RelInput input)

Creates a Union by parsing serialized output.

Method Details

estimateRowCount

public double estimateRowCount(RelMetadataQuery mq)

Description copied from interface: RelNode

Returns an estimate of the number of rows this relational expression will return.

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

Specified by:

estimateRowCount in interface RelNode

Overrides:

estimateRowCount in class AbstractRelNode

Parameters:

mq - Metadata query

Returns:

Estimate of the number of rows this relational expression will return

estimateRowCount

@Deprecated public static double estimateRowCount(RelNode rel)

Deprecated.