org.apache.calcite.rel.logical

类 LogicalTableScan

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.core.TableScan

org.apache.calcite.rel.logical.LogicalTableScan

所有已实现的接口:

Cloneable, org.apache.calcite.plan.RelOptNode, org.apache.calcite.rel.hint.Hintable, org.apache.calcite.rel.RelNode

public final class LogicalTableScan
extends org.apache.calcite.rel.core.TableScan

A LogicalTableScan reads all the rows from a RelOptTable.

This class is copied from Calcite because the explainTerms(org.apache.calcite.rel.RelWriter) should consider hints.

If the table is a net.sf.saffron.ext.JdbcTable, then this is literally possible. But for other kinds of tables, there may be many ways to read the data from the table. For some kinds of table, it may not even be possible to read all of the rows unless some narrowing constraint is applied.

In the example of the net.sf.saffron.ext.ReflectSchema schema,

select from fields

cannot be implemented, but

select from fields as f
 where f.getClass().getName().equals("java.lang.String")

can. It is the optimizer's responsibility to find these ways, by applying transformation rules.

嵌套类概要

从接口继承的嵌套类/接口 org.apache.calcite.rel.RelNode

org.apache.calcite.rel.RelNode.Context

字段概要

从类继承的字段 org.apache.calcite.rel.core.TableScan

hints, table

从类继承的字段 org.apache.calcite.rel.AbstractRelNode

digest, id, rowType, traitSet

构造器概要

构造器

构造器和说明
LogicalTableScan(org.apache.calcite.rel.RelInput input) Creates a LogicalTableScan by parsing serialized output.
LogicalTableScan(org.apache.calcite.plan.RelOptCluster cluster, org.apache.calcite.plan.RelOptTable table) 已过时。
LogicalTableScan(org.apache.calcite.plan.RelOptCluster cluster, org.apache.calcite.plan.RelTraitSet traitSet, List<org.apache.calcite.rel.hint.RelHint> hints, org.apache.calcite.plan.RelOptTable table) Creates a LogicalTableScan.
LogicalTableScan(org.apache.calcite.plan.RelOptCluster cluster, org.apache.calcite.plan.RelTraitSet traitSet, org.apache.calcite.plan.RelOptTable table) 已过时。

方法概要

限定符和类型	方法和说明
org.apache.calcite.rel.RelNode	copy(org.apache.calcite.plan.RelTraitSet traitSet, List<org.apache.calcite.rel.RelNode> inputs)
static LogicalTableScan	create(org.apache.calcite.plan.RelOptCluster cluster, org.apache.calcite.plan.RelOptTable relOptTable, List<org.apache.calcite.rel.hint.RelHint> hints) Creates a LogicalTableScan.
org.apache.calcite.rel.RelWriter	explainTerms(org.apache.calcite.rel.RelWriter pw)
org.apache.calcite.rel.RelNode	withHints(List<org.apache.calcite.rel.hint.RelHint> hintList)

从类继承的方法 org.apache.calcite.rel.core.TableScan

accept, computeSelfCost, deriveRowType, estimateRowCount, getHints, getTable, identity, identity, project

从类继承的方法 org.apache.calcite.rel.AbstractRelNode

accept, childrenAccept, collectVariablesSet, collectVariablesUsed, deepEquals, deepHashCode, equals, explain, getCluster, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getInputs, getRelDigest, getRelTypeName, getRowType, getTraitSet, getVariablesSet, hashCode, isEnforcer, isValid, metadata, onRegister, recomputeDigest, register, replaceInput, sole, toString

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.calcite.rel.hint.Hintable

attachHints

从接口继承的方法 org.apache.calcite.rel.RelNode

explain

构造器详细资料

LogicalTableScan

public LogicalTableScan(org.apache.calcite.plan.RelOptCluster cluster,
                        org.apache.calcite.plan.RelTraitSet traitSet,
                        List<org.apache.calcite.rel.hint.RelHint> hints,
                        org.apache.calcite.plan.RelOptTable table)

Creates a LogicalTableScan.

Use create(org.apache.calcite.plan.RelOptCluster, org.apache.calcite.plan.RelOptTable, java.util.List<org.apache.calcite.rel.hint.RelHint>) unless you know what you're doing.

LogicalTableScan

@Deprecated
public LogicalTableScan(org.apache.calcite.plan.RelOptCluster cluster,
                                    org.apache.calcite.plan.RelTraitSet traitSet,
                                    org.apache.calcite.plan.RelOptTable table)

已过时。

LogicalTableScan

@Deprecated
public LogicalTableScan(org.apache.calcite.plan.RelOptCluster cluster,
                                    org.apache.calcite.plan.RelOptTable table)

已过时。

LogicalTableScan

public LogicalTableScan(org.apache.calcite.rel.RelInput input)

Creates a LogicalTableScan by parsing serialized output.

方法详细资料

copy

public org.apache.calcite.rel.RelNode copy(org.apache.calcite.plan.RelTraitSet traitSet,
                                           List<org.apache.calcite.rel.RelNode> inputs)

指定者:

copy 在接口中 org.apache.calcite.rel.RelNode

覆盖:

copy 在类中 org.apache.calcite.rel.AbstractRelNode

explainTerms

public org.apache.calcite.rel.RelWriter explainTerms(org.apache.calcite.rel.RelWriter pw)

覆盖:

explainTerms 在类中 org.apache.calcite.rel.core.TableScan

create

public static LogicalTableScan create(org.apache.calcite.plan.RelOptCluster cluster,
                                      org.apache.calcite.plan.RelOptTable relOptTable,
                                      List<org.apache.calcite.rel.hint.RelHint> hints)

Creates a LogicalTableScan.

参数:

cluster - Cluster

relOptTable - Table

hints - The hints

withHints

public org.apache.calcite.rel.RelNode withHints(List<org.apache.calcite.rel.hint.RelHint> hintList)