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Extract CanonicalizeExpressionRewriter
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...n/java/com/facebook/presto/sql/planner/iterative/rule/CanonicalizeExpressionRewriter.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,118 @@ | ||
| /* | ||
| * 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.sql.planner.iterative.rule; | ||
|
|
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| import com.facebook.presto.sql.tree.CurrentTime; | ||
| import com.facebook.presto.sql.tree.Expression; | ||
| import com.facebook.presto.sql.tree.ExpressionRewriter; | ||
| import com.facebook.presto.sql.tree.ExpressionTreeRewriter; | ||
| import com.facebook.presto.sql.tree.Extract; | ||
| import com.facebook.presto.sql.tree.FunctionCall; | ||
| import com.facebook.presto.sql.tree.IfExpression; | ||
| import com.facebook.presto.sql.tree.IsNotNullPredicate; | ||
| import com.facebook.presto.sql.tree.IsNullPredicate; | ||
| import com.facebook.presto.sql.tree.NotExpression; | ||
| import com.facebook.presto.sql.tree.QualifiedName; | ||
| import com.facebook.presto.sql.tree.SearchedCaseExpression; | ||
| import com.facebook.presto.sql.tree.WhenClause; | ||
| import com.google.common.collect.ImmutableList; | ||
|
|
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| import java.util.Optional; | ||
|
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| public class CanonicalizeExpressionRewriter | ||
| extends ExpressionRewriter<Void> | ||
| { | ||
| @Override | ||
| public Expression rewriteIsNotNullPredicate(IsNotNullPredicate node, Void context, ExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| Expression value = treeRewriter.rewrite(node.getValue(), context); | ||
| return new NotExpression(new IsNullPredicate(value)); | ||
| } | ||
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| @Override | ||
| public Expression rewriteIfExpression(IfExpression node, Void context, ExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| Expression condition = treeRewriter.rewrite(node.getCondition(), context); | ||
| Expression trueValue = treeRewriter.rewrite(node.getTrueValue(), context); | ||
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| Optional<Expression> falseValue = node.getFalseValue() | ||
| .map((value) -> treeRewriter.rewrite(value, context)); | ||
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| return new SearchedCaseExpression(ImmutableList.of(new WhenClause(condition, trueValue)), falseValue); | ||
| } | ||
|
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| @Override | ||
| public Expression rewriteCurrentTime(CurrentTime node, Void context, ExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| if (node.getPrecision() != null) { | ||
| throw new UnsupportedOperationException("not yet implemented: non-default precision"); | ||
| } | ||
|
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| switch (node.getType()) { | ||
| case DATE: | ||
| return new FunctionCall(QualifiedName.of("current_date"), ImmutableList.of()); | ||
| case TIME: | ||
| return new FunctionCall(QualifiedName.of("current_time"), ImmutableList.of()); | ||
| case LOCALTIME: | ||
| return new FunctionCall(QualifiedName.of("localtime"), ImmutableList.of()); | ||
| case TIMESTAMP: | ||
| return new FunctionCall(QualifiedName.of("current_timestamp"), ImmutableList.of()); | ||
| case LOCALTIMESTAMP: | ||
| return new FunctionCall(QualifiedName.of("localtimestamp"), ImmutableList.of()); | ||
| default: | ||
| throw new UnsupportedOperationException("not yet implemented: " + node.getType()); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public Expression rewriteExtract(Extract node, Void context, ExpressionTreeRewriter<Void> treeRewriter) | ||
| { | ||
| Expression value = treeRewriter.rewrite(node.getExpression(), context); | ||
|
|
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| switch (node.getField()) { | ||
| case YEAR: | ||
| return new FunctionCall(QualifiedName.of("year"), ImmutableList.of(value)); | ||
| case QUARTER: | ||
| return new FunctionCall(QualifiedName.of("quarter"), ImmutableList.of(value)); | ||
| case MONTH: | ||
| return new FunctionCall(QualifiedName.of("month"), ImmutableList.of(value)); | ||
| case WEEK: | ||
| return new FunctionCall(QualifiedName.of("week"), ImmutableList.of(value)); | ||
| case DAY: | ||
| case DAY_OF_MONTH: | ||
| return new FunctionCall(QualifiedName.of("day"), ImmutableList.of(value)); | ||
| case DAY_OF_WEEK: | ||
| case DOW: | ||
| return new FunctionCall(QualifiedName.of("day_of_week"), ImmutableList.of(value)); | ||
| case DAY_OF_YEAR: | ||
| case DOY: | ||
| return new FunctionCall(QualifiedName.of("day_of_year"), ImmutableList.of(value)); | ||
| case YEAR_OF_WEEK: | ||
| case YOW: | ||
| return new FunctionCall(QualifiedName.of("year_of_week"), ImmutableList.of(value)); | ||
| case HOUR: | ||
| return new FunctionCall(QualifiedName.of("hour"), ImmutableList.of(value)); | ||
| case MINUTE: | ||
| return new FunctionCall(QualifiedName.of("minute"), ImmutableList.of(value)); | ||
| case SECOND: | ||
| return new FunctionCall(QualifiedName.of("second"), ImmutableList.of(value)); | ||
| case TIMEZONE_MINUTE: | ||
| return new FunctionCall(QualifiedName.of("timezone_minute"), ImmutableList.of(value)); | ||
| case TIMEZONE_HOUR: | ||
| return new FunctionCall(QualifiedName.of("timezone_hour"), ImmutableList.of(value)); | ||
| } | ||
|
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| throw new UnsupportedOperationException("not yet implemented: " + node.getField()); | ||
| } | ||
| } |
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61 changes: 61 additions & 0 deletions
61
...va/com/facebook/presto/sql/planner/iterative/rule/TestCanonicalizeExpressionRewriter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /* | ||
| * 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.sql.planner.iterative.rule; | ||
|
|
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| import com.facebook.presto.sql.planner.iterative.rule.test.PlanBuilder; | ||
| import com.facebook.presto.sql.tree.Expression; | ||
| import com.facebook.presto.sql.tree.ExpressionTreeRewriter; | ||
| import org.testng.annotations.Test; | ||
|
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| import static org.testng.Assert.assertEquals; | ||
|
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| public class TestCanonicalizeExpressionRewriter | ||
| { | ||
| private static final CanonicalizeExpressionRewriter rewriter = new CanonicalizeExpressionRewriter(); | ||
|
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| @Test | ||
| public void testRewriteIsNotNullPredicate() | ||
| { | ||
| assertRewritten("x is NOT NULL", "NOT (x IS NULL)"); | ||
| } | ||
|
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| @Test | ||
| public void testRewriteIfExpression() | ||
| { | ||
| assertRewritten("IF(x = 0, 0, 1)", "CASE WHEN x = 0 THEN 0 ELSE 1 END"); | ||
| } | ||
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| @Test | ||
| public void testRewriteCurrentTime() | ||
| { | ||
| assertRewritten("CURRENT_TIME", "\"current_time\"()"); | ||
| } | ||
|
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| @Test | ||
| public void testRewriteYearExtract() | ||
| throws Exception | ||
| { | ||
| assertRewritten("EXTRACT(YEAR FROM '2017-07-20')", "year('2017-07-20')"); | ||
| } | ||
|
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| private static void assertRewritten(String from, String to) | ||
| { | ||
| assertEquals(rewrite(PlanBuilder.expression(from)), PlanBuilder.expression(to)); | ||
| } | ||
|
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| private static Expression rewrite(Expression expression) | ||
| { | ||
| return ExpressionTreeRewriter.rewriteWith(rewriter, expression); | ||
| } | ||
| } |