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Pushdown CAST in JOIN criteria for PostgreSql
Co-authored-by: Semion Paramonow <[email protected]>
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plugin/trino-base-jdbc/src/main/java/io/trino/plugin/jdbc/expression/RewriteCast.java
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| @@ -0,0 +1,77 @@ | ||
| /* | ||
| * 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 io.trino.plugin.jdbc.expression; | ||
|
|
||
| import io.trino.matching.Capture; | ||
| import io.trino.matching.Captures; | ||
| import io.trino.matching.Pattern; | ||
| import io.trino.plugin.base.expression.ConnectorExpressionRule; | ||
| import io.trino.plugin.jdbc.WriteMapping; | ||
| import io.trino.spi.connector.ConnectorSession; | ||
| import io.trino.spi.expression.Call; | ||
| import io.trino.spi.expression.ConnectorExpression; | ||
| import io.trino.spi.type.Type; | ||
|
|
||
| import java.util.Optional; | ||
| import java.util.function.BiFunction; | ||
|
|
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| import static io.trino.matching.Capture.newCapture; | ||
| import static io.trino.plugin.base.expression.ConnectorExpressionPatterns.argument; | ||
| import static io.trino.plugin.base.expression.ConnectorExpressionPatterns.argumentCount; | ||
| import static io.trino.plugin.base.expression.ConnectorExpressionPatterns.call; | ||
| import static io.trino.plugin.base.expression.ConnectorExpressionPatterns.expression; | ||
| import static io.trino.plugin.base.expression.ConnectorExpressionPatterns.functionName; | ||
| import static io.trino.spi.expression.StandardFunctions.CAST_FUNCTION_NAME; | ||
| import static java.lang.String.format; | ||
| import static java.util.Objects.requireNonNull; | ||
|
|
||
| public class RewriteCast | ||
| implements ConnectorExpressionRule<Call, ParameterizedExpression> | ||
| { | ||
| private static final Capture<ConnectorExpression> VALUE = newCapture(); | ||
| private final BiFunction<ConnectorSession, Type, WriteMapping> toWriteMapping; | ||
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| public RewriteCast(BiFunction<ConnectorSession, Type, WriteMapping> toWriteMapping) | ||
| { | ||
| this.toWriteMapping = requireNonNull(toWriteMapping, "toWriteMapping is null"); | ||
| } | ||
|
|
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| @Override | ||
| public Pattern<Call> getPattern() | ||
| { | ||
| return call() | ||
| .with(functionName().equalTo(CAST_FUNCTION_NAME)) | ||
| .with(argumentCount().equalTo(1)) | ||
| .with(argument(0).matching(expression().capturedAs(VALUE))); | ||
| } | ||
|
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| @Override | ||
| public Optional<ParameterizedExpression> rewrite(Call call, Captures captures, RewriteContext<ParameterizedExpression> context) | ||
| { | ||
| Type trinoType = call.getType(); | ||
| ConnectorExpression capturedValue = captures.get(VALUE); | ||
|
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| Optional<ParameterizedExpression> value = context.defaultRewrite(capturedValue); | ||
| if (value.isEmpty()) { | ||
| // if argument is a call chain that can't be rewritten, then we can't push it down | ||
| return Optional.empty(); | ||
| } | ||
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| String targetType = toWriteMapping.apply(context.getSession(), trinoType).getDataType(); | ||
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| return Optional.of(new ParameterizedExpression( | ||
| format("CAST(%s AS %s)", value.get().expression(), targetType), | ||
| value.get().parameters())); | ||
| } | ||
| } |
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