content: /*
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * Licensed 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
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.calcite.rex;
  
  import org.apache.calcite.plan.RelOptPredicateList;
  import org.apache.calcite.sql.SqlKind;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  public class GraphRexSimplify extends RexSimplify {
      public GraphRexSimplify(
              RexBuilder rexBuilder, RelOptPredicateList predicates, RexExecutor executor) {
          super(rexBuilder, predicates, executor);
      }
  
      /**
       * default implementation in calcite will try to simplify {@code AND} or {@code OR} conditions to single {@code SEARCH} condition,
       * i.e. a.age > 10 and a.age < 20 --> a.age SEARCH range(10, 20).
       * we override the function to skip the simplification for {@code SEARCH} operator is unsupported yet in physical layer.
       * @param e
       * @param unknownAs
       * @return
       */
      @Override
      RexNode simplify(RexNode e, RexUnknownAs unknownAs) {
          if (e.getKind() == SqlKind.AND || e.getKind() == SqlKind.OR) {
              return e;
          } else {
              return super.simplify(e, unknownAs);
          }
      }
  
      @Override
      public @Nullable RexNode simplifyFilterPredicates(Iterable<? extends RexNode> predicates) {
          RexNode simplifiedAnds =
                  simplifyUnknownAsFalse(RexUtil.composeConjunction(this.rexBuilder, predicates));
          return simplifiedAnds.isAlwaysFalse() ? null : this.removeNullabilityCast(simplifiedAnds);
      }
  }
  