org.apache.drill.exec.planner.logical.DrillProjectLateralJoinTransposeRule Maven / Gradle / Ivy

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.drill.exec.planner.logical;


import org.apache.calcite.plan.RelOptRuleCall;
import org.apache.calcite.rel.core.Correlate;
import org.apache.calcite.rel.core.RelFactories;
import org.apache.calcite.rel.rules.ProjectCorrelateTransposeRule;
import org.apache.calcite.rel.rules.PushProjector;
import org.apache.calcite.tools.RelBuilderFactory;

public class DrillProjectLateralJoinTransposeRule extends ProjectCorrelateTransposeRule {

  public static final DrillProjectLateralJoinTransposeRule INSTANCE = new DrillProjectLateralJoinTransposeRule(PushProjector.ExprCondition.TRUE, RelFactories.LOGICAL_BUILDER);

  public DrillProjectLateralJoinTransposeRule(PushProjector.ExprCondition preserveExprCondition, RelBuilderFactory relFactory) {
    super(Config.DEFAULT.withRelBuilderFactory(relFactory)
      .as(Config.class)
      .withPreserveExprCondition(preserveExprCondition));
  }

  @Override
  public boolean matches(RelOptRuleCall call) {
    Correlate correlate = call.rel(1);


    // No need to call ProjectCorrelateTransposeRule if the current lateralJoin contains excludeCorrelationColumn set to true.
    // This is needed as the project push into Lateral join rule changes the output row type which will fail assertions in ProjectCorrelateTransposeRule.
    return !(correlate instanceof DrillLateralJoinRel) ||
      !((DrillLateralJoinRel) correlate).excludeCorrelateColumn;
  }
}