org.apache.flink.table.planner.plan.rules.logical

类 WrapJsonAggFunctionArgumentsRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelRule<WrapJsonAggFunctionArgumentsRule.Config>

org.apache.flink.table.planner.plan.rules.logical.WrapJsonAggFunctionArgumentsRule

@Internal
public class WrapJsonAggFunctionArgumentsRule
extends org.apache.calcite.plan.RelRule<WrapJsonAggFunctionArgumentsRule.Config>

Transforms JSON aggregation functions by wrapping operands into BuiltInFunctionDefinitions.JSON_STRING.

Essentially, a call like JSON_OBJECTAGG(f0 VALUE f1) will be transformed into JSON_OBJECTAGG(f0 VALUE JSON_STRING(f1)). By placing a marker RelHint on the aggregation afterwards we ensure that this transformation occurs just once.

BuiltInFunctionDefinitions.JSON_STRING will take care of serializing the values into their correct representation, and the actual aggregation function's implementation can simply insert the values as raw nodes instead. This avoids having to re-implement the logic for all supported types in the aggregation function again.

嵌套类概要

嵌套类

限定符和类型	类和说明
static interface	WrapJsonAggFunctionArgumentsRule.Config Configuration for WrapJsonAggFunctionArgumentsRule.

从类继承的嵌套类/接口 org.apache.calcite.plan.RelRule

org.apache.calcite.plan.RelRule.Done, org.apache.calcite.plan.RelRule.MatchHandler<R extends org.apache.calcite.plan.RelOptRule>, org.apache.calcite.plan.RelRule.OperandBuilder, org.apache.calcite.plan.RelRule.OperandDetailBuilder<R extends org.apache.calcite.rel.RelNode>, org.apache.calcite.plan.RelRule.OperandTransform

从类继承的嵌套类/接口 org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand

字段概要

字段

限定符和类型	字段和说明
static org.apache.calcite.plan.RelOptRule	INSTANCE

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

config

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
WrapJsonAggFunctionArgumentsRule(WrapJsonAggFunctionArgumentsRule.Config config)

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 org.apache.calcite.plan.RelOptRule INSTANCE

构造器详细资料

WrapJsonAggFunctionArgumentsRule

public WrapJsonAggFunctionArgumentsRule(WrapJsonAggFunctionArgumentsRule.Config config)

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