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Support cast projection pushdown in oracle
Co-authored-by: Sasha Sheikin <[email protected]>
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plugin/trino-oracle/src/main/java/io/trino/plugin/oracle/RewriteCast.java
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|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| /* | ||
| * 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.oracle; | ||
|
|
||
| import io.trino.matching.Capture; | ||
| import io.trino.matching.Captures; | ||
| import io.trino.matching.Pattern; | ||
| import io.trino.plugin.base.projection.ProjectFunctionRule; | ||
| import io.trino.plugin.jdbc.JdbcExpression; | ||
| import io.trino.plugin.jdbc.JdbcTypeHandle; | ||
| import io.trino.plugin.jdbc.WriteMapping; | ||
| import io.trino.plugin.jdbc.expression.ParameterizedExpression; | ||
| import io.trino.spi.connector.ConnectorSession; | ||
| import io.trino.spi.expression.Call; | ||
| import io.trino.spi.expression.ConnectorExpression; | ||
| import io.trino.spi.type.CharType; | ||
| import io.trino.spi.type.Type; | ||
| import io.trino.spi.type.VarcharType; | ||
| import oracle.jdbc.OracleTypes; | ||
|
|
||
| import java.util.Optional; | ||
| import java.util.function.BiFunction; | ||
|
|
||
| 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.plugin.oracle.OracleClient.ORACLE_CHAR_MAX_CHARS; | ||
| import static io.trino.plugin.oracle.OracleClient.ORACLE_VARCHAR2_MAX_CHARS; | ||
| 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 ProjectFunctionRule<JdbcExpression, ParameterizedExpression> | ||
| { | ||
| private static final Capture<ConnectorExpression> VALUE = newCapture(); | ||
| private final BiFunction<ConnectorSession, Type, WriteMapping> toWriteMapping; | ||
|
|
||
| public RewriteCast(BiFunction<ConnectorSession, Type, WriteMapping> toWriteMapping) | ||
| { | ||
| this.toWriteMapping = requireNonNull(toWriteMapping, "toWriteMapping is null"); | ||
| } | ||
|
|
||
| @Override | ||
| public Pattern<Call> getPattern() | ||
| { | ||
| return call() | ||
| .with(functionName().equalTo(CAST_FUNCTION_NAME)) | ||
| .with(argumentCount().equalTo(1)) | ||
| .with(argument(0).matching(expression().capturedAs(VALUE))); | ||
| } | ||
|
|
||
| @Override | ||
| public Optional<JdbcExpression> rewrite(ConnectorExpression projectionExpression, Captures captures, RewriteContext<ParameterizedExpression> context) | ||
| { | ||
| Call call = (Call) projectionExpression; | ||
| Type trinoType = call.getType(); | ||
| ConnectorExpression capturedValue = captures.get(VALUE); | ||
|
|
||
| Optional<ParameterizedExpression> value = context.rewriteExpression(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(); | ||
| } | ||
| Optional<JdbcTypeHandle> targetTypeHandle = toJdbcTypeHandle(trinoType); | ||
| if (targetTypeHandle.isEmpty()) { | ||
| return Optional.empty(); | ||
| } | ||
|
|
||
| String targetType = toWriteMapping.apply(context.getSession(), trinoType).getDataType(); | ||
|
|
||
| return Optional.of(new JdbcExpression( | ||
| format("CAST(%s AS %s)", value.get().expression(), targetType), | ||
| value.get().parameters(), | ||
| targetTypeHandle.get())); | ||
| } | ||
|
|
||
| private static Optional<JdbcTypeHandle> toJdbcTypeHandle(Type type) | ||
| { | ||
| if (type instanceof CharType charType) { | ||
| if (charType.getLength() > ORACLE_CHAR_MAX_CHARS) { | ||
| return Optional.empty(); | ||
| } | ||
| return Optional.of(new JdbcTypeHandle(OracleTypes.CHAR, Optional.of(charType.getBaseName()), Optional.of(charType.getLength()), Optional.empty(), Optional.empty(), Optional.empty())); | ||
| } | ||
| if (type instanceof VarcharType varcharType) { | ||
| if (varcharType.isUnbounded() || varcharType.getBoundedLength() > ORACLE_VARCHAR2_MAX_CHARS) { | ||
| return Optional.empty(); | ||
| } | ||
| return Optional.of(new JdbcTypeHandle(OracleTypes.VARCHAR, Optional.of("VARCHAR2"), varcharType.getLength(), Optional.empty(), Optional.empty(), Optional.empty())); | ||
| } | ||
| return Optional.empty(); | ||
| } | ||
| } |
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