org.apache.calcite.adapter.jdbc

Class JdbcRules.JdbcJoinRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.convert.ConverterRule

org.apache.calcite.adapter.jdbc.JdbcRules.JdbcConverterRule

org.apache.calcite.adapter.jdbc.JdbcRules.JdbcJoinRule

Enclosing class:

JdbcRules

public static class JdbcRules.JdbcJoinRule
extends JdbcRules.JdbcConverterRule

Rule that converts a join to JDBC.

Field Summary

Fields inherited from class org.apache.calcite.adapter.jdbc.JdbcRules.JdbcConverterRule

out

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor and Description
JdbcJoinRule(JdbcConvention out) Creates a JdbcJoinRule.

Method Summary

Modifier and Type	Method and Description
private boolean	canJoinOnCondition(RexNode node) Returns whether a condition is supported by JdbcRules.JdbcJoin.
RelNode	convert(Join join, boolean convertInputTraits) Converts a Join into a JdbcJoin.
RelNode	convert(RelNode rel) Converts a relational expression to the target trait(s) of this rule.

Methods inherited from class org.apache.calcite.rel.convert.ConverterRule

getInTrait, getOutConvention, getOutTrait, getTraitDef, isGuaranteed, onMatch

Methods inherited from class org.apache.calcite.plan.RelOptRule

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

Methods inherited from class java.lang.Object

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

Constructor Detail

JdbcJoinRule

public JdbcJoinRule(JdbcConvention out)

Creates a JdbcJoinRule.

Method Detail

convert

public RelNode convert(RelNode rel)

Description copied from class: ConverterRule

Converts a relational expression to the target trait(s) of this rule.

Returns null if conversion is not possible.

Specified by:

convert in class ConverterRule

convert

public RelNode convert(Join join,
                       boolean convertInputTraits)

Converts a Join into a JdbcJoin.

Parameters:

join - Join operator to convert

convertInputTraits - Whether to convert input to join's JDBC convention

Returns:

A new JdbcJoin

canJoinOnCondition

private boolean canJoinOnCondition(RexNode node)

Returns whether a condition is supported by JdbcRules.JdbcJoin.

Corresponds to the capabilities of SqlImplementor.convertConditionToSqlNode(org.apache.calcite.rex.RexNode, org.apache.calcite.rel.rel2sql.SqlImplementor.Context, org.apache.calcite.rel.rel2sql.SqlImplementor.Context, int).

Parameters:

node - Condition

Returns:

Whether condition is supported