| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // 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 |
| // |
| // 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.impala.analysis; |
| |
| import org.apache.impala.thrift.TJoinOp; |
| |
| public enum JoinOperator { |
| INNER_JOIN("INNER JOIN", TJoinOp.INNER_JOIN), |
| LEFT_OUTER_JOIN("LEFT OUTER JOIN", TJoinOp.LEFT_OUTER_JOIN), |
| LEFT_SEMI_JOIN("LEFT SEMI JOIN", TJoinOp.LEFT_SEMI_JOIN), |
| LEFT_ANTI_JOIN("LEFT ANTI JOIN", TJoinOp.LEFT_ANTI_JOIN), |
| RIGHT_OUTER_JOIN("RIGHT OUTER JOIN", TJoinOp.RIGHT_OUTER_JOIN), |
| RIGHT_SEMI_JOIN("RIGHT SEMI JOIN", TJoinOp.RIGHT_SEMI_JOIN), |
| RIGHT_ANTI_JOIN("RIGHT ANTI JOIN", TJoinOp.RIGHT_ANTI_JOIN), |
| FULL_OUTER_JOIN("FULL OUTER JOIN", TJoinOp.FULL_OUTER_JOIN), |
| CROSS_JOIN("CROSS JOIN", TJoinOp.CROSS_JOIN), |
| // Variant of the LEFT ANTI JOIN that is used for the rewrite of |
| // NOT IN subqueries. It can have a single equality join conjunct |
| // that returns TRUE when the rhs is NULL. |
| NULL_AWARE_LEFT_ANTI_JOIN("NULL AWARE LEFT ANTI JOIN", |
| TJoinOp.NULL_AWARE_LEFT_ANTI_JOIN); |
| |
| private final String description_; |
| private final TJoinOp thriftJoinOp_; |
| |
| private JoinOperator(String description, TJoinOp thriftJoinOp) { |
| this.description_ = description; |
| this.thriftJoinOp_ = thriftJoinOp; |
| } |
| |
| @Override |
| public String toString() { return description_; } |
| public TJoinOp toThrift() { return thriftJoinOp_; } |
| |
| public boolean isInnerJoin() { return this == INNER_JOIN; } |
| public boolean isLeftOuterJoin() { return this == LEFT_OUTER_JOIN; } |
| public boolean isRightOuterJoin() { return this == RIGHT_OUTER_JOIN; } |
| |
| public boolean isOuterJoin() { |
| return this == LEFT_OUTER_JOIN |
| || this == RIGHT_OUTER_JOIN |
| || this == FULL_OUTER_JOIN; |
| } |
| |
| public boolean isSemiJoin() { |
| return this == JoinOperator.LEFT_SEMI_JOIN || this == JoinOperator.LEFT_ANTI_JOIN || |
| this == JoinOperator.RIGHT_SEMI_JOIN || this == JoinOperator.RIGHT_ANTI_JOIN || |
| this == JoinOperator.NULL_AWARE_LEFT_ANTI_JOIN; |
| } |
| |
| public boolean isLeftSemiJoin() { |
| return this == JoinOperator.LEFT_SEMI_JOIN || this == JoinOperator.LEFT_ANTI_JOIN || |
| this == JoinOperator.NULL_AWARE_LEFT_ANTI_JOIN; |
| } |
| |
| public boolean isRightSemiJoin() { |
| return this == JoinOperator.RIGHT_SEMI_JOIN || this == JoinOperator.RIGHT_ANTI_JOIN; |
| } |
| |
| public boolean isCrossJoin() { |
| return this == JoinOperator.CROSS_JOIN; |
| } |
| |
| public boolean isFullOuterJoin() { |
| return this == JoinOperator.FULL_OUTER_JOIN; |
| } |
| |
| public boolean isNullAwareLeftAntiJoin() { |
| return this == JoinOperator.NULL_AWARE_LEFT_ANTI_JOIN; |
| } |
| |
| public boolean isAntiJoin() { |
| return this == JoinOperator.LEFT_ANTI_JOIN || this == JoinOperator.RIGHT_ANTI_JOIN || |
| this == JoinOperator.NULL_AWARE_LEFT_ANTI_JOIN; |
| } |
| |
| public JoinOperator invert() { |
| switch (this) { |
| case LEFT_OUTER_JOIN: return RIGHT_OUTER_JOIN; |
| case RIGHT_OUTER_JOIN: return LEFT_OUTER_JOIN; |
| case LEFT_SEMI_JOIN: return RIGHT_SEMI_JOIN; |
| case RIGHT_SEMI_JOIN: return LEFT_SEMI_JOIN; |
| case LEFT_ANTI_JOIN: return RIGHT_ANTI_JOIN; |
| case RIGHT_ANTI_JOIN: return LEFT_ANTI_JOIN; |
| case NULL_AWARE_LEFT_ANTI_JOIN: throw new IllegalStateException("Not implemented"); |
| default: return this; |
| } |
| } |
| } |