Package org.apache.calcite.rel.stream

Class Delta

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.SingleRel

org.apache.calcite.rel.stream.Delta

All Implemented Interfaces:

Cloneable, RelOptNode, RelNode

Direct Known Subclasses:

LogicalDelta

public abstract class Delta
extends SingleRel

Relational operator that converts a relation to a stream.

For example, if Orders is a table, and TableScan(Orders) is a relational operator that returns the current contents of the table, then Delta(TableScan(Orders)) is a relational operator that returns all inserts into the table.

If unrestricted, Delta returns all previous inserts into the table (from time -∞ to now) and all future inserts into the table (from now to +∞) and never terminates.

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.SingleRel

input

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

digest, id, rowType, traitSet

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Delta(RelOptCluster cluster, RelTraitSet traits, RelNode input)
protected	Delta(RelInput input)	Creates a Delta by parsing serialized output.

Method Summary

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

childrenAccept, deriveRowType, estimateRowCount, explainTerms, getInput, getInputs, replaceInput

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

accept, accept, collectVariablesSet, collectVariablesUsed, computeSelfCost, copy, 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, fieldIsNullable, stripped

Constructor Details

Delta

protected Delta(RelOptCluster cluster,
 RelTraitSet traits,
 RelNode input)

Delta

protected Delta(RelInput input)

Creates a Delta by parsing serialized output.