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Remove source location from CanonicalPlanGenerator
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...essions/src/main/java/com/facebook/presto/expressions/CanonicalRowExpressionRewriter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| /* | ||
| * 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 com.facebook.presto.expressions; | ||
|
|
||
| import com.facebook.presto.spi.relation.CallExpression; | ||
| import com.facebook.presto.spi.relation.ConstantExpression; | ||
| import com.facebook.presto.spi.relation.InputReferenceExpression; | ||
| import com.facebook.presto.spi.relation.LambdaDefinitionExpression; | ||
| import com.facebook.presto.spi.relation.RowExpression; | ||
| import com.facebook.presto.spi.relation.SpecialFormExpression; | ||
| import com.facebook.presto.spi.relation.VariableReferenceExpression; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
| import java.util.Collections; | ||
| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.Optional; | ||
|
|
||
| public class CanonicalRowExpressionRewriter | ||
| extends RowExpressionRewriter<Void> | ||
| { | ||
| private static final CanonicalRowExpressionRewriter SINGLETON = new CanonicalRowExpressionRewriter(); | ||
|
|
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| private CanonicalRowExpressionRewriter() {} | ||
|
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| public static RowExpression canonicalizeRowExpression(RowExpression expression) | ||
| { | ||
| return RowExpressionTreeRewriter.rewriteWith(SINGLETON, expression, null); | ||
| } | ||
|
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| @Override | ||
| public RowExpression rewriteInputReference(InputReferenceExpression input, Void context, RowExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| return input.canonicalize(); | ||
| } | ||
|
|
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| @Override | ||
| public RowExpression rewriteCall(CallExpression call, Void context, RowExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| List<RowExpression> arguments = rewrite(call.getArguments(), context, treeRewriter); | ||
|
|
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| if (!sameElements(call.getArguments(), arguments)) { | ||
| return new CallExpression(Optional.empty(), call.getDisplayName(), call.getFunctionHandle(), call.getType(), arguments); | ||
| } | ||
| return call.canonicalize(); | ||
| } | ||
|
|
||
| @Override | ||
| public RowExpression rewriteConstant(ConstantExpression literal, Void context, RowExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| return literal.canonicalize(); | ||
| } | ||
|
|
||
| @Override | ||
| public RowExpression rewriteLambda(LambdaDefinitionExpression lambda, Void context, RowExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| RowExpression body = treeRewriter.rewrite(lambda.getBody(), context); | ||
| if (body != lambda.getBody()) { | ||
| return new LambdaDefinitionExpression(Optional.empty(), lambda.getArgumentTypes(), lambda.getArguments(), body); | ||
| } | ||
|
|
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| return lambda.canonicalize(); | ||
| } | ||
|
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| @Override | ||
| public RowExpression rewriteVariableReference(VariableReferenceExpression variable, Void context, RowExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| return variable.canonicalize(); | ||
| } | ||
|
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||
| @Override | ||
| public RowExpression rewriteSpecialForm(SpecialFormExpression specialForm, Void context, RowExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| List<RowExpression> arguments = rewrite(specialForm.getArguments(), context, treeRewriter); | ||
|
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| if (!sameElements(specialForm.getArguments(), arguments)) { | ||
| return new SpecialFormExpression(Optional.empty(), specialForm.getForm(), specialForm.getType(), arguments); | ||
| } | ||
| return specialForm.canonicalize(); | ||
| } | ||
|
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| private List<RowExpression> rewrite(List<RowExpression> items, Void context, RowExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| List<RowExpression> rewrittenExpressions = new ArrayList<>(); | ||
| for (RowExpression expression : items) { | ||
| rewrittenExpressions.add(treeRewriter.rewrite(expression, context)); | ||
| } | ||
| return Collections.unmodifiableList(rewrittenExpressions); | ||
| } | ||
|
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||
| @SuppressWarnings("ObjectEquality") | ||
| private static <T> boolean sameElements(Collection<? extends T> a, Collection<? extends T> b) | ||
| { | ||
| if (a.size() != b.size()) { | ||
| return false; | ||
| } | ||
|
|
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| Iterator<? extends T> first = a.iterator(); | ||
| Iterator<? extends T> second = b.iterator(); | ||
|
|
||
| while (first.hasNext() && second.hasNext()) { | ||
| if (first.next() != second.next()) { | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
| } |
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