morrySnow commented on code in PR #10462: URL: https://github.com/apache/doris/pull/10462#discussion_r908182921
########## fe/fe-core/src/main/java/org/apache/doris/nereids/util/ExpressionUtils.java: ########## @@ -0,0 +1,142 @@ +// 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.doris.nereids.util; + +import org.apache.doris.nereids.trees.NodeType; +import org.apache.doris.nereids.trees.expressions.CompoundPredicate; +import org.apache.doris.nereids.trees.expressions.Expression; +import org.apache.doris.nereids.trees.expressions.Literal; + +import com.google.common.collect.Lists; + +import java.util.LinkedHashSet; +import java.util.LinkedList; +import java.util.List; +import java.util.Objects; +import java.util.stream.Collectors; + +/** + * Expression rewrite helper class. + */ +public class ExpressionUtils { + + public static final Literal TRUE_LITERAL = new Literal(true); + public static final Literal FALSE_LITERAL = new Literal(false); + + public static boolean isConstant(Expression expr) { + return expr.isConstant(); + } + + public static List<Expression> extractConjunct(Expression expr) { + return extract(NodeType.AND, expr); + } + + + public static List<Expression> extractDisjunct(Expression expr) { + return extract(NodeType.OR, expr); + } + + public static List<Expression> extract(CompoundPredicate expr) { + return extract(expr.getType(), expr); + } + + private static List<Expression> extract(NodeType op, Expression expr) { + List<Expression> result = Lists.newArrayList(); + extract(op, expr, result); + return result; + } + + private static void extract(NodeType op, Expression expr, List<Expression> result) { + if (expr instanceof CompoundPredicate && expr.getType() == op) { + CompoundPredicate predicate = (CompoundPredicate) expr; + extract(op, predicate.left(), result); + extract(op, predicate.right(), result); + } else { + result.add(expr); + } + } + + + public static Expression add(List<Expression> expressions) { + return combine(NodeType.AND, expressions); + } + + public static Expression add(Expression... expressions) { + return combine(NodeType.AND, Lists.newArrayList(expressions)); + } + + public static Expression or(Expression... expressions) { + return combine(NodeType.OR, Lists.newArrayList(expressions)); + } + + public static Expression or(List<Expression> expressions) { + return combine(NodeType.OR, expressions); + } + + /** + * Use AND/OR to combine expressions together. + */ + public static Expression combine(NodeType op, List<Expression> expressions) { + + Objects.requireNonNull(expressions, "expressions is null"); + + if (expressions.size() == 0) { + if (op == NodeType.AND) { + return new Literal(true); + } + if (op == NodeType.OR) { + return new Literal(false); + } + } + + if (expressions.size() == 1) { + return expressions.get(0); + } + + List<Expression> distinctExpressions = Lists.newArrayList(new LinkedHashSet<>(expressions)); Review Comment: i got it, it is used for unique -- 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. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
