com.hazelcast.jet.sql.impl.opt.physical.StreamAggregateCannotExecuteRule Maven / Gradle / Ivy
/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.opt.physical;
import com.hazelcast.jet.sql.impl.opt.OptUtils;
import com.hazelcast.jet.sql.impl.opt.logical.AggregateLogicalRel;
import com.hazelcast.org.apache.calcite.plan.RelOptRule;
import com.hazelcast.org.apache.calcite.plan.RelOptRuleCall;
import com.hazelcast.org.apache.calcite.plan.RelRule;
import com.hazelcast.org.apache.calcite.plan.RelRule.Config;
import static com.hazelcast.jet.sql.impl.opt.Conventions.LOGICAL;
/**
* A rule that replaces any streaming aggregation with {@link CannotExecuteRel}.
* This is to handle cases when the aggregation isn't implemented by replacing
* it with {@link CannotExecuteRel}, which has infinity cost. If no other rule
* replaces the aggregation with something that can be executed, the error will
* be thrown to the user.
*
* Currently, there's only {@link AggregateSlidingWindowPhysicalRule} that
* handles some streaming aggregation cases.
*/
public final class StreamAggregateCannotExecuteRule extends RelRule {
private static final Config RULE_CONFIG = Config.EMPTY
.withDescription(StreamAggregateCannotExecuteRule.class.getSimpleName())
.withOperandSupplier(b0 -> b0.operand(AggregateLogicalRel.class)
.trait(LOGICAL)
.predicate(OptUtils::isUnbounded)
.anyInputs()
);
private StreamAggregateCannotExecuteRule() {
super(RULE_CONFIG);
}
@SuppressWarnings("checkstyle:DeclarationOrder")
public static final RelOptRule INSTANCE = new StreamAggregateCannotExecuteRule();
@Override
public void onMatch(RelOptRuleCall call) {
AggregateLogicalRel aggr = call.rel(0);
call.transformTo(
new CannotExecuteRel(aggr.getCluster(), OptUtils.toPhysicalConvention(aggr.getTraitSet()), aggr.getRowType(),
"Streaming aggregation is supported only for window aggregation, with imposed watermark order " +
"(see TUMBLE/HOP and IMPOSE_ORDER functions)"));
}
}