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73
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/DecoupleEncodeDecode.java
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| // 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. | ||
|
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| package org.apache.doris.nereids.rules.rewrite; | ||
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| import org.apache.doris.nereids.rules.Rule; | ||
| import org.apache.doris.nereids.rules.RuleType; | ||
| import org.apache.doris.nereids.trees.expressions.Alias; | ||
| import org.apache.doris.nereids.trees.expressions.Expression; | ||
| import org.apache.doris.nereids.trees.expressions.NamedExpression; | ||
| import org.apache.doris.nereids.trees.expressions.functions.scalar.DecodeAsVarchar; | ||
| import org.apache.doris.nereids.trees.expressions.functions.scalar.EncodeString; | ||
| import org.apache.doris.nereids.trees.plans.logical.LogicalProject; | ||
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| import com.google.common.collect.Lists; | ||
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| import java.util.List; | ||
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| /** | ||
| * in project: | ||
| * decode_as_varchar(encode_as_xxx(v)) => v | ||
| */ | ||
| public class DecoupleEncodeDecode extends OneRewriteRuleFactory { | ||
| @Override | ||
| public Rule build() { | ||
| return logicalProject().then(this::rewrite) | ||
| .toRule(RuleType.DECOUPLE_DECODE_ENCODE_SLOT); | ||
| } | ||
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| private LogicalProject<?> rewrite(LogicalProject<?> project) { | ||
| List<NamedExpression> newProjections = Lists.newArrayList(); | ||
| boolean hasNewProjections = false; | ||
| for (NamedExpression e : project.getProjects()) { | ||
| boolean changed = false; | ||
| if (e instanceof Alias) { | ||
| Alias alias = (Alias) e; | ||
| Expression body = alias.child(); | ||
| if (body instanceof DecodeAsVarchar && body.child(0) instanceof EncodeString) { | ||
| Expression encodeBody = body.child(0).child(0); | ||
| newProjections.add((NamedExpression) alias.withChildren(encodeBody)); | ||
| changed = true; | ||
| } else if (body instanceof EncodeString && body.child(0) instanceof DecodeAsVarchar) { | ||
| Expression decodeBody = body.child(0).child(0); | ||
| newProjections.add((NamedExpression) alias.withChildren(decodeBody)); | ||
| changed = true; | ||
| } | ||
| } | ||
| if (!changed) { | ||
| newProjections.add(e); | ||
| hasNewProjections = true; | ||
| } | ||
| } | ||
| if (hasNewProjections) { | ||
| project = project.withProjects(newProjections); | ||
| } | ||
| return project; | ||
| } | ||
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| } |
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