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

Class RewriteIntersectAllRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelRule<RewriteIntersectAllRule.RewriteIntersectAllRuleConfig>

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

@Enclosing
public class RewriteIntersectAllRule
extends org.apache.calcite.plan.RelRule<RewriteIntersectAllRule.RewriteIntersectAllRuleConfig>

Replaces logical Intersect operator using a combination of union all, aggregate and table function.

Original Query : SELECT c1 FROM ut1 INTERSECT ALL SELECT c1 FROM ut2

Rewritten Query:
 
   SELECT c1
   FROM (
     SELECT c1, If (vcol_left_cnt > vcol_right_cnt, vcol_right_cnt, vcol_left_cnt) AS min_count
     FROM (
       SELECT
         c1,
         count(vcol_left_marker) as vcol_left_cnt,
         count(vcol_right_marker) as vcol_right_cnt
       FROM (
         SELECT c1, true as vcol_left_marker, null as vcol_right_marker FROM ut1
         UNION ALL
         SELECT c1, null as vcol_left_marker, true as vcol_right_marker FROM ut2
       ) AS union_all
       GROUP BY c1
     )
     WHERE vcol_left_cnt >= 1 AND vcol_right_cnt >= 1
     )
   )
   LATERAL TABLE(replicate_row(min_count, c1)) AS T(c1) 
 

Only handle the case of input size 2.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	RewriteIntersectAllRule.RewriteIntersectAllRuleConfig	Rule configuration.

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelRule

org.apache.calcite.plan.RelRule.Config, 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

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand

Field Summary

Fields

Modifier and Type	Field	Description
static final RewriteIntersectAllRule	INSTANCE

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

config

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	RewriteIntersectAllRule(RewriteIntersectAllRule.RewriteIntersectAllRuleConfig config)

Method Summary

Modifier and Type	Method	Description
boolean	matches(org.apache.calcite.plan.RelOptRuleCall call)
void	onMatch(org.apache.calcite.plan.RelOptRuleCall call)

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

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

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final RewriteIntersectAllRule INSTANCE

Constructor Details

RewriteIntersectAllRule

protected RewriteIntersectAllRule(RewriteIntersectAllRule.RewriteIntersectAllRuleConfig config)

Method Details

matches

public boolean matches(org.apache.calcite.plan.RelOptRuleCall call)

Overrides:

matches in class org.apache.calcite.plan.RelOptRule

onMatch

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

Specified by:

onMatch in class org.apache.calcite.plan.RelOptRule