com.hazelcast.org.apache.calcite.adapter.enumerable.EnumerableMergeJoinRule Maven / Gradle / Ivy
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* (the "License"); you may not use this file except in compliance with
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* http://www.apache.org/licenses/LICENSE-2.0
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package com.hazelcast.org.apache.calcite.adapter.enumerable;
import com.hazelcast.org.apache.calcite.linq4j.Ord;
import com.hazelcast.org.apache.calcite.plan.Convention;
import com.hazelcast.org.apache.calcite.plan.RelOptCluster;
import com.hazelcast.org.apache.calcite.plan.RelTraitSet;
import com.hazelcast.org.apache.calcite.rel.RelCollation;
import com.hazelcast.org.apache.calcite.rel.RelCollations;
import com.hazelcast.org.apache.calcite.rel.RelFieldCollation;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.convert.ConverterRule;
import com.hazelcast.org.apache.calcite.rel.core.Join;
import com.hazelcast.org.apache.calcite.rel.core.JoinInfo;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalJoin;
import com.hazelcast.org.apache.calcite.rex.RexBuilder;
import com.hazelcast.org.apache.calcite.rex.RexNode;
import com.hazelcast.org.apache.calcite.rex.RexUtil;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/** Planner rule that converts a
* {@link LogicalJoin} relational expression
* {@link EnumerableConvention enumerable calling convention}.
* You may provide a custom config to convert other nodes that extend {@link Join}.
*
* @see EnumerableJoinRule
* @see EnumerableRules#ENUMERABLE_MERGE_JOIN_RULE
*/
class EnumerableMergeJoinRule extends ConverterRule {
/** Default configuration. */
static final Config DEFAULT_CONFIG = Config.INSTANCE
.withConversion(LogicalJoin.class, Convention.NONE,
EnumerableConvention.INSTANCE, "EnumerableMergeJoinRule")
.withRuleFactory(EnumerableMergeJoinRule::new);
/** Called from the Config. */
protected EnumerableMergeJoinRule(Config config) {
super(config);
}
@Override public @Nullable RelNode convert(RelNode rel) {
Join join = (Join) rel;
final JoinInfo info = join.analyzeCondition();
if (!EnumerableMergeJoin.isMergeJoinSupported(join.getJoinType())) {
// EnumerableMergeJoin only supports certain join types.
return null;
}
if (info.pairs().size() == 0) {
// EnumerableMergeJoin CAN support cartesian join, but disable it for now.
return null;
}
final List newInputs = new ArrayList<>();
final List collations = new ArrayList<>();
int offset = 0;
for (Ord ord : Ord.zip(join.getInputs())) {
RelTraitSet traits = ord.e.getTraitSet()
.replace(EnumerableConvention.INSTANCE);
if (!info.pairs().isEmpty()) {
final List fieldCollations = new ArrayList<>();
for (int key : info.keys().get(ord.i)) {
fieldCollations.add(
new RelFieldCollation(key, RelFieldCollation.Direction.ASCENDING,
RelFieldCollation.NullDirection.LAST));
}
final RelCollation collation = RelCollations.of(fieldCollations);
collations.add(RelCollations.shift(collation, offset));
traits = traits.replace(collation);
}
newInputs.add(convert(ord.e, traits));
offset += ord.e.getRowType().getFieldCount();
}
final RelNode left = newInputs.get(0);
final RelNode right = newInputs.get(1);
final RelOptCluster cluster = join.getCluster();
RelNode newRel;
RelTraitSet traitSet = join.getTraitSet()
.replace(EnumerableConvention.INSTANCE);
if (!collations.isEmpty()) {
traitSet = traitSet.replace(collations);
}
// Re-arrange condition: first the equi-join elements, then the non-equi-join ones (if any);
// this is not strictly necessary but it will be useful to avoid spurious errors in the
// unit tests when verifying the plan.
final RexBuilder rexBuilder = join.getCluster().getRexBuilder();
final RexNode equi = info.getEquiCondition(left, right, rexBuilder);
final RexNode condition;
if (info.isEqui()) {
condition = equi;
} else {
final RexNode nonEqui = RexUtil.composeConjunction(rexBuilder, info.nonEquiConditions);
condition = RexUtil.composeConjunction(rexBuilder, Arrays.asList(equi, nonEqui));
}
newRel = new EnumerableMergeJoin(cluster,
traitSet,
left,
right,
condition,
join.getVariablesSet(),
join.getJoinType());
return newRel;
}
}
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