sujun1020 commented on a change in pull request #13306: URL: https://github.com/apache/flink/pull/13306#discussion_r484235277
########## File path: flink-formats/flink-orc/src/main/java/org/apache/flink/orc/OrcFilters.java ########## @@ -0,0 +1,372 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 org.apache.flink.orc; + +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.api.java.tuple.Tuple3; +import org.apache.flink.table.expressions.CallExpression; +import org.apache.flink.table.expressions.Expression; +import org.apache.flink.table.expressions.FieldReferenceExpression; +import org.apache.flink.table.expressions.ValueLiteralExpression; +import org.apache.flink.table.functions.BuiltInFunctionDefinitions; +import org.apache.flink.table.functions.FunctionDefinition; +import org.apache.flink.table.types.DataType; +import org.apache.flink.table.types.logical.LogicalTypeRoot; + +import org.apache.flink.shaded.curator4.com.google.common.collect.ImmutableMap; + +import org.apache.hadoop.hive.ql.io.sarg.PredicateLeaf; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.Serializable; +import java.util.Optional; +import java.util.function.Function; + +/** + * Utility class that provides helper methods to work with Orc Filter PushDown. + */ +public class OrcFilters { + + private static final Logger LOG = LoggerFactory.getLogger(OrcFileSystemFormatFactory.class); + + private static final ImmutableMap<FunctionDefinition, Function<CallExpression, OrcSplitReader.Predicate>> FILTERS = + new ImmutableMap.Builder<FunctionDefinition, Function<CallExpression, OrcSplitReader.Predicate>>() + .put(BuiltInFunctionDefinitions.IS_NULL, createIsNullPredicateConverter()) + .put(BuiltInFunctionDefinitions.IS_NOT_NULL, createIsNotNullPredicateConverter()) + .put(BuiltInFunctionDefinitions.NOT, createNotPredicateConverter()) + .put(BuiltInFunctionDefinitions.OR, createOrPredicateConverter()) + .put(BuiltInFunctionDefinitions.EQUALS, createEqualsPredicateConverter()) + .put(BuiltInFunctionDefinitions.NOT_EQUALS, createNotEqualsPredicateConverter()) + .put(BuiltInFunctionDefinitions.GREATER_THAN, createGreaterThanPredicateConverter()) + .put(BuiltInFunctionDefinitions.GREATER_THAN_OR_EQUAL, createGreaterThanEqualsPredicateConverter()) + .put(BuiltInFunctionDefinitions.LESS_THAN, createLessThanPredicateConverter()) + .put(BuiltInFunctionDefinitions.LESS_THAN_OR_EQUAL, createLessThanEqualsPredicateConverter()) + .build(); + + private static boolean isUnaryValid(CallExpression callExpression) { + return callExpression.getChildren().size() == 1 && callExpression.getChildren().get(0) instanceof FieldReferenceExpression; + } + + private static boolean isBinaryValid(CallExpression callExpression) { + return callExpression.getChildren().size() == 2 && ((callExpression.getChildren().get(0) instanceof FieldReferenceExpression && callExpression.getChildren().get(1) instanceof ValueLiteralExpression) || + (callExpression.getChildren().get(0) instanceof ValueLiteralExpression && callExpression.getChildren().get(1) instanceof FieldReferenceExpression)); + } + + private static Tuple2<String, PredicateLeaf.Type> getTuple2Args(CallExpression callExp){ + if (!isUnaryValid(callExp)) { + // not a valid predicate + LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.", callExp); + return null; + } + + PredicateLeaf.Type colType = toOrcType(((FieldReferenceExpression) callExp.getChildren().get(0)).getOutputDataType()); + if (colType == null) { + // unsupported type + LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.", callExp); + return null; + } + + String colName = getColumnName(callExp); + + return Tuple2.of(colName, colType); + } + + private static Tuple3<String, PredicateLeaf.Type, Serializable> getTuple3Args(CallExpression callExp){ + if (!isBinaryValid(callExp)) { + // not a valid predicate + LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.", callExp); + return null; + } + + PredicateLeaf.Type litType = getLiteralType(callExp); + if (litType == null) { + // unsupported literal type + LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.", callExp); + return null; + } + + String colName = getColumnName(callExp); + + // fetch literal and ensure it is serializable + Object literalObj = getLiteral(callExp).get(); + Serializable literal; + // validate that literal is serializable + if (literalObj instanceof Serializable) { + literal = (Serializable) literalObj; + } else { + LOG.warn("Encountered a non-serializable literal of type {}. " + + "Cannot push predicate [{}] into OrcFileSystemFormatFactory. " + + "This is a bug and should be reported.", + literalObj.getClass().getCanonicalName(), callExp); + return null; + } + + return Tuple3.of(colName, litType, literal); + } + + private static Function<CallExpression, OrcSplitReader.Predicate> createIsNullPredicateConverter(){ + return callExp -> { + Tuple2<String, PredicateLeaf.Type> tuple2 = getTuple2Args(callExp); + + if (tuple2 == null){ + return null; + } + + return new OrcSplitReader.IsNull(tuple2.f0, tuple2.f1); + }; + } + + private static Function<CallExpression, OrcSplitReader.Predicate> createIsNotNullPredicateConverter(){ + return callExp -> { + + Tuple2<String, PredicateLeaf.Type> tuple2 = getTuple2Args(callExp); + + if (tuple2 == null){ + return null; + } + + return new OrcSplitReader.Not( + new OrcSplitReader.IsNull(tuple2.f0, tuple2.f1)); + }; + } + + private static Function<CallExpression, OrcSplitReader.Predicate> createNotPredicateConverter(){ + return callExp -> { + if (callExp.getChildren().size() != 1) { + // not a valid predicate + LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.", callExp); + return null; + } + + OrcSplitReader.Predicate c = toOrcPredicate(callExp.getChildren().get(0)); + if (c == null) { + return null; + } else { + return new OrcSplitReader.Not(c); + } + }; + } + + private static Function<CallExpression, OrcSplitReader.Predicate> createOrPredicateConverter(){ + return callExp -> { + if (callExp.getChildren().size() < 2) { + return null; + } + Expression left = callExp.getChildren().get(0); + Expression right = callExp.getChildren().get(1); + + OrcSplitReader.Predicate c1 = toOrcPredicate(left); + OrcSplitReader.Predicate c2 = toOrcPredicate(right); + if (c1 == null || c2 == null) { + return null; + } else { + return new OrcSplitReader.Or(c1, c2); + } + }; + } + + private static Function<CallExpression, OrcSplitReader.Predicate> createEqualsPredicateConverter(){ + return callExp -> { + Tuple3<String, PredicateLeaf.Type, Serializable> tuple3 = getTuple3Args(callExp); + + if (tuple3 == null){ + return null; + } + return new OrcSplitReader.Equals(tuple3.f0, tuple3.f1, tuple3.f2); + }; + } + + private static Function<CallExpression, OrcSplitReader.Predicate> createNotEqualsPredicateConverter(){ Review comment: I got it, Thanks a lot ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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