org.apache.calcite.adapter.csv

类 CsvProjectTableScanRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.adapter.csv.CsvProjectTableScanRule

public class CsvProjectTableScanRule
extends org.apache.calcite.plan.RelOptRule

Planner rule that projects from a CsvTableScan scan just the columns needed to satisfy a projection. If the projection's expressions are trivial, the projection is removed.

字段概要

字段

限定符和类型	字段和说明
static CsvProjectTableScanRule	INSTANCE

从类继承的字段 org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

构造器概要

构造器

构造器和说明
CsvProjectTableScanRule(org.apache.calcite.tools.RelBuilderFactory relBuilderFactory) Creates a CsvProjectTableScanRule.

方法概要

限定符和类型	方法和说明
void	onMatch(org.apache.calcite.plan.RelOptRuleCall call)

从类继承的方法 org.apache.calcite.plan.RelOptRule

any, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered

从类继承的方法 java.lang.Object

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

字段详细资料

INSTANCE

public static final CsvProjectTableScanRule INSTANCE

构造器详细资料

CsvProjectTableScanRule

public CsvProjectTableScanRule(org.apache.calcite.tools.RelBuilderFactory relBuilderFactory)

Creates a CsvProjectTableScanRule.

参数:

relBuilderFactory - Builder for relational expressions

方法详细资料

onMatch

public void onMatch(org.apache.calcite.plan.RelOptRuleCall call)

指定者:

onMatch 在类中 org.apache.calcite.plan.RelOptRule