Package org.apache.calcite.rel.core
Class Union
- java.lang.Object
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- org.apache.calcite.rel.AbstractRelNode
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- org.apache.calcite.rel.core.SetOp
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- org.apache.calcite.rel.core.Union
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- All Implemented Interfaces:
java.lang.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
andUNION ALL
.
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Nested Class Summary
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Nested classes/interfaces inherited from interface org.apache.calcite.rel.RelNode
RelNode.Context
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Constructor Summary
Constructors Modifier Constructor Description protected
Union(RelOptCluster cluster, RelTraitSet traits, java.util.List<RelNode> inputs, boolean all)
protected
Union(RelInput input)
Creates a Union by parsing serialized output.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods 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
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Methods inherited from class org.apache.calcite.rel.AbstractRelNode
accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, computeDigest, computeSelfCost, computeSelfCost, explain, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getQuery, getRelTypeName, getRows, getRowType, getTable, getTraitSet, getVariablesSet, getVariablesStopped, isDistinct, isKey, isValid, isValid, metadata, onRegister, recomputeDigest, register, sole, toString
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Constructor Detail
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Union
protected Union(RelOptCluster cluster, RelTraitSet traits, java.util.List<RelNode> inputs, boolean all)
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Union
protected Union(RelInput input)
Creates a Union by parsing serialized output.
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Method Detail
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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 interfaceRelNode
- Overrides:
estimateRowCount
in classAbstractRelNode
- Parameters:
mq
- Metadata query- Returns:
- Estimate of the number of rows this relational expression will return
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estimateRowCount
@Deprecated public static double estimateRowCount(RelNode rel)
Deprecated.
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