Package org.apache.calcite.rel.core
Class Minus
- 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.Minus
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- All Implemented Interfaces:
java.lang.Cloneable
,RelOptNode
,RelNode
- Direct Known Subclasses:
EnumerableMinus
,JdbcRules.JdbcMinus
,LogicalMinus
public abstract class Minus extends SetOp
Relational expression that returns the rows of its first input minus any matching rows from its other inputs.Corresponds to the SQL
EXCEPT
operator.If "all" is true, then multiset subtraction is performed; otherwise, set subtraction is performed (implying no duplicates in the results).
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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 Minus(RelOptCluster cluster, RelTraitSet traits, java.util.List<RelNode> inputs, boolean all)
protected
Minus(RelInput input)
Creates a Minus by parsing serialized output.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description double
estimateRowCount(RelMetadataQuery mq)
Returns an estimate of the number of rows this relational expression will return.-
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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Minus
public Minus(RelOptCluster cluster, RelTraitSet traits, java.util.List<RelNode> inputs, boolean all)
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Minus
protected Minus(RelInput input)
Creates a Minus 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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