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Add support for complex function pushdown in JDBC connectors. This comes with example implementation for LIKE pushdown in PostgreSQL.
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128 changes: 128 additions & 0 deletions
128
...in-toolkit/src/main/java/io/trino/plugin/base/expression/ConnectorExpressionPatterns.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| /* | ||
| * 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.base.expression; | ||
|
|
||
| import com.google.common.collect.ImmutableList; | ||
| import io.trino.matching.Pattern; | ||
| import io.trino.matching.Property; | ||
| import io.trino.spi.expression.Call; | ||
| import io.trino.spi.expression.ConnectorExpression; | ||
| import io.trino.spi.expression.Constant; | ||
| import io.trino.spi.expression.FunctionName; | ||
| import io.trino.spi.expression.Variable; | ||
| import io.trino.spi.type.Type; | ||
|
|
||
| import java.util.List; | ||
| import java.util.Optional; | ||
| import java.util.function.Predicate; | ||
|
|
||
| import static com.google.common.base.Preconditions.checkArgument; | ||
| import static com.google.common.collect.ImmutableList.toImmutableList; | ||
| import static java.lang.String.format; | ||
| import static java.util.Objects.requireNonNull; | ||
|
|
||
| public final class ConnectorExpressionPatterns | ||
| { | ||
| private ConnectorExpressionPatterns() {} | ||
|
|
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| public static Pattern<ConnectorExpression> expression() | ||
| { | ||
| return Pattern.typeOf(ConnectorExpression.class); | ||
| } | ||
|
|
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| public static Property<ConnectorExpression, ?, Type> type() | ||
| { | ||
| return Property.property("type", ConnectorExpression::getType); | ||
| } | ||
|
|
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| public static Pattern<Call> call() | ||
| { | ||
| return Pattern.typeOf(Call.class); | ||
| } | ||
|
|
||
| /** | ||
| * @see #functionUnqualifiedName() | ||
| */ | ||
| public static Property<Call, ?, FunctionName> functionName() | ||
| { | ||
| return Property.property("functionName", Call::getFunctionName); | ||
| } | ||
|
|
||
| /** | ||
| * @see #functionName() | ||
| */ | ||
| public static Property<Call, ?, String> functionUnqualifiedName() | ||
| { | ||
| return Property.optionalProperty("functionUnqualifiedName", call -> { | ||
| FunctionName functionName = call.getFunctionName(); | ||
| if (functionName.getCatalogSchema().isPresent()) { | ||
| // The name is qualified. | ||
| return Optional.empty(); | ||
| } | ||
| return Optional.of(functionName.getName()); | ||
| }); | ||
| } | ||
|
|
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| public static Property<Call, ?, Integer> argumentCount() | ||
| { | ||
| return Property.property("argumentCount", call -> call.getArguments().size()); | ||
| } | ||
|
|
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| public static Property<Call, ?, ConnectorExpression> argument(int argument) | ||
| { | ||
| checkArgument(0 <= argument, "Invalid argument index: %s", argument); | ||
| return Property.optionalProperty(format("argument(%s)", argument), call -> { | ||
| if (argument < call.getArguments().size()) { | ||
| return Optional.of(call.getArguments().get(argument)); | ||
| } | ||
| return Optional.empty(); | ||
| }); | ||
| } | ||
|
|
||
| public static Property<Call, ?, Type> argumentType(int argument) | ||
| { | ||
| checkArgument(0 <= argument, "Invalid argument index: %s", argument); | ||
| return Property.optionalProperty(format("argumentType(%s)", argument), call -> { | ||
| if (argument < call.getArguments().size()) { | ||
| return Optional.of(call.getArguments().get(argument).getType()); | ||
| } | ||
| return Optional.empty(); | ||
| }); | ||
| } | ||
|
|
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| public static Property<Call, ?, List<Type>> argumentTypes() | ||
| { | ||
| return Property.property("argumentTypes", call -> call.getArguments().stream() | ||
| .map(ConnectorExpression::getType) | ||
| .collect(toImmutableList())); | ||
| } | ||
|
|
||
| public static Pattern<Constant> constant() | ||
| { | ||
| return Pattern.typeOf(Constant.class); | ||
| } | ||
|
|
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| public static Pattern<Variable> variable() | ||
| { | ||
| return Pattern.typeOf(Variable.class); | ||
| } | ||
|
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| public static Predicate<List<? extends ConnectorExpression>> expressionTypes(Type... types) | ||
| { | ||
| List<Type> expectedTypes = ImmutableList.copyOf(requireNonNull(types, "types is null")); | ||
| return expressions -> expectedTypes.equals(expressions.stream() | ||
| .map(ConnectorExpression::getType) | ||
| .collect(toImmutableList())); | ||
| } | ||
| } |
113 changes: 113 additions & 0 deletions
113
...in-toolkit/src/main/java/io/trino/plugin/base/expression/ConnectorExpressionRewriter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| /* | ||
| * 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.base.expression; | ||
|
|
||
| import com.google.common.collect.ImmutableSet; | ||
| import io.trino.matching.Capture; | ||
| import io.trino.matching.Match; | ||
| import io.trino.matching.Pattern; | ||
| import io.trino.plugin.base.expression.ConnectorExpressionRule.RewriteContext; | ||
| import io.trino.spi.connector.ColumnHandle; | ||
| import io.trino.spi.connector.ConnectorSession; | ||
| import io.trino.spi.expression.ConnectorExpression; | ||
|
|
||
| import java.util.Iterator; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
| import java.util.Set; | ||
| import java.util.function.Function; | ||
|
|
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| import static com.google.common.base.Verify.verify; | ||
| import static io.trino.matching.Capture.newCapture; | ||
| import static java.util.Objects.requireNonNull; | ||
|
|
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| public final class ConnectorExpressionRewriter<Result> | ||
| { | ||
| private final Function<String, String> identifierQuote; | ||
| private final Set<ConnectorExpressionRule<?, Result>> rules; | ||
|
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| public ConnectorExpressionRewriter(Function<String, String> identifierQuote, Set<ConnectorExpressionRule<?, Result>> rules) | ||
| { | ||
| this.identifierQuote = requireNonNull(identifierQuote, "identifierQuote is null"); | ||
| this.rules = ImmutableSet.copyOf(requireNonNull(rules, "rules is null")); | ||
| } | ||
|
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| public Optional<Result> rewrite(ConnectorSession session, ConnectorExpression expression, Map<String, ColumnHandle> assignments) | ||
| { | ||
| requireNonNull(session, "session is null"); | ||
| requireNonNull(expression, "expression is null"); | ||
| requireNonNull(assignments, "assignments is null"); | ||
|
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| RewriteContext<Result> context = new RewriteContext<>() | ||
| { | ||
| @Override | ||
| public Map<String, ColumnHandle> getAssignments() | ||
| { | ||
| return assignments; | ||
| } | ||
|
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| @Override | ||
| public Function<String, String> getIdentifierQuote() | ||
| { | ||
| return identifierQuote; | ||
| } | ||
|
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| @Override | ||
| public ConnectorSession getSession() | ||
| { | ||
| return session; | ||
| } | ||
|
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| @Override | ||
| public Optional<Result> defaultRewrite(ConnectorExpression expression) | ||
| { | ||
| return rewrite(expression, this); | ||
| } | ||
| }; | ||
|
|
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| return rewrite(expression, context); | ||
| } | ||
|
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| private Optional<Result> rewrite(ConnectorExpression expression, RewriteContext<Result> context) | ||
| { | ||
| for (ConnectorExpressionRule<?, Result> rule : rules) { | ||
| Optional<Result> rewritten = rewrite(rule, expression, context); | ||
| if (rewritten.isPresent()) { | ||
| return rewritten; | ||
| } | ||
| } | ||
|
|
||
| return Optional.empty(); | ||
| } | ||
|
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| private <ExpressionType extends ConnectorExpression> Optional<Result> rewrite( | ||
| ConnectorExpressionRule<ExpressionType, Result> rule, | ||
| ConnectorExpression expression, | ||
| RewriteContext<Result> context) | ||
| { | ||
| Capture<ExpressionType> expressionCapture = newCapture(); | ||
| Pattern<ExpressionType> pattern = rule.getPattern().capturedAs(expressionCapture); | ||
| Iterator<Match> matches = pattern.match(expression, context).iterator(); | ||
| while (matches.hasNext()) { | ||
| Match match = matches.next(); | ||
| ExpressionType capturedExpression = match.capture(expressionCapture); | ||
| verify(capturedExpression == expression); | ||
| Optional<Result> rewritten = rule.rewrite(capturedExpression, match.captures(), context); | ||
| if (rewritten.isPresent()) { | ||
| return rewritten; | ||
| } | ||
| } | ||
| return Optional.empty(); | ||
| } | ||
| } |
53 changes: 53 additions & 0 deletions
53
...plugin-toolkit/src/main/java/io/trino/plugin/base/expression/ConnectorExpressionRule.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| /* | ||
| * 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.base.expression; | ||
|
|
||
| import io.trino.matching.Captures; | ||
| import io.trino.matching.Pattern; | ||
| import io.trino.spi.connector.ColumnHandle; | ||
| import io.trino.spi.connector.ConnectorSession; | ||
| import io.trino.spi.expression.ConnectorExpression; | ||
|
|
||
| import java.util.Map; | ||
| import java.util.Optional; | ||
| import java.util.function.Function; | ||
|
|
||
| import static com.google.common.base.Verify.verifyNotNull; | ||
| import static java.util.Objects.requireNonNull; | ||
|
|
||
| public interface ConnectorExpressionRule<ExpressionType extends ConnectorExpression, Result> | ||
| { | ||
| Pattern<ExpressionType> getPattern(); | ||
|
|
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| Optional<Result> rewrite(ExpressionType expression, Captures captures, RewriteContext<Result> context); | ||
|
|
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| interface RewriteContext<Result> | ||
| { | ||
| default ColumnHandle getAssignment(String name) | ||
| { | ||
| requireNonNull(name, "name is null"); | ||
| ColumnHandle columnHandle = getAssignments().get(name); | ||
| verifyNotNull(columnHandle, "No assignment for %s", name); | ||
| return columnHandle; | ||
| } | ||
|
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| Map<String, ColumnHandle> getAssignments(); | ||
|
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| Function<String, String> getIdentifierQuote(); | ||
|
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| ConnectorSession getSession(); | ||
|
|
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| Optional<Result> defaultRewrite(ConnectorExpression expression); | ||
| } | ||
| } |
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