jun-he commented on a change in pull request #357: Add in and not in predicates URL: https://github.com/apache/incubator-iceberg/pull/357#discussion_r340447350
########## File path: api/src/main/java/org/apache/iceberg/expressions/BoundSetPredicate.java ########## @@ -0,0 +1,192 @@ +/* + * 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.iceberg.expressions; + +import com.google.common.base.Joiner; +import com.google.common.base.Preconditions; +import com.google.common.collect.ImmutableSet; +import java.io.Serializable; +import java.util.Collection; +import java.util.Iterator; +import java.util.Set; +import org.apache.iceberg.util.CharSequenceWrapper; + +public class BoundSetPredicate<T> extends Predicate<BoundReference<T>> { + private final LiteralSet<T> literalSet; + + @SuppressWarnings("unchecked") + BoundSetPredicate(Operation op, BoundReference<T> ref, Set<Literal<T>> lits) { + super(op, ref); + Preconditions.checkArgument(op == Operation.IN || op == Operation.NOT_IN, + "%s predicate does not support a set of literals", op); + if (lits.iterator().next() instanceof Literals.StringLiteral) { + this.literalSet = (LiteralSet<T>) new CharSeqLiteralSet((Set) lits); + } else { + this.literalSet = new LiteralSet<>(lits); + } + } + + BoundSetPredicate(Operation op, BoundReference<T> ref, LiteralSet<T> lits) { + super(op, ref); + Preconditions.checkArgument(op == Operation.IN || op == Operation.NOT_IN, + "%s predicate does not support a literal set", op); + this.literalSet = lits; + } + + @Override + public Expression negate() { + return new BoundSetPredicate<>(op().negate(), ref(), literalSet); + } + + public Set<T> literalSet() { + return literalSet; + } + + @Override + String literalString() { + return literalSet.toString(); + } + + /** + * Represents a set of literal values in an IN or NOT_IN predicate + * @param <T> The Java type of the value, which can be wrapped by a {@link Literal} + */ + private static class LiteralSet<T> implements Set<T>, Serializable { + private final Set<T> values; + + LiteralSet(Iterator<T> vals) { + this.values = ImmutableSet.<T>builder().addAll(vals).build(); + } + + LiteralSet(Set<Literal<T>> lits) { + Preconditions.checkArgument(lits == null || lits.size() > 1, + "The input literal set must include more than 1 element."); + values = ImmutableSet.<T>builder().addAll( + lits.stream().map(Literal::value).iterator()).build(); + } + + Set<T> getValues() { Review comment: Thanks for the comment. Fixed. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For additional commands, e-mail: issues-h...@iceberg.apache.org
