ahmedabu98 commented on code in PR #34827: URL: https://github.com/apache/beam/pull/34827#discussion_r2075794099
########## sdks/java/io/iceberg/src/main/java/org/apache/beam/sdk/io/iceberg/FilterUtils.java: ########## @@ -0,0 +1,301 @@ +/* + * 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.beam.sdk.io.iceberg; + +import static org.apache.beam.sdk.util.Preconditions.checkArgumentNotNull; +import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument; + +import java.math.BigDecimal; +import java.time.LocalDate; +import java.time.LocalDateTime; +import java.time.LocalTime; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.function.BiFunction; +import java.util.stream.Collectors; +import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.SqlBasicCall; +import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.SqlIdentifier; +import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.SqlKind; +import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.SqlLiteral; +import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.SqlNode; +import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.SqlNodeList; +import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.SqlOperator; +import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.parser.SqlParseException; +import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.parser.SqlParser; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap; +import org.apache.iceberg.Schema; +import org.apache.iceberg.data.Record; +import org.apache.iceberg.expressions.Evaluator; +import org.apache.iceberg.expressions.Expression; +import org.apache.iceberg.expressions.Expression.Operation; +import org.apache.iceberg.expressions.Expressions; +import org.apache.iceberg.types.Type.TypeID; +import org.apache.iceberg.util.DateTimeUtil; +import org.apache.iceberg.util.NaNUtil; +import org.checkerframework.checker.nullness.qual.Nullable; + +/** + * Utilities that convert between a SQL filter expression and an Iceberg {@link Expression}. Uses + * Apache Calcite semantics. + * + * <p>Note: Only supports top-level fields (i.e. cannot reference nested fields). + */ +class FilterUtils { + private static final Map<SqlKind, Operation> FILTERS = + ImmutableMap.<SqlKind, Operation>builder() + .put(SqlKind.IS_NULL, Operation.IS_NULL) + .put(SqlKind.IS_NOT_NULL, Operation.NOT_NULL) + .put(SqlKind.LESS_THAN, Operation.LT) + .put(SqlKind.LESS_THAN_OR_EQUAL, Operation.LT_EQ) + .put(SqlKind.GREATER_THAN, Operation.GT) + .put(SqlKind.GREATER_THAN_OR_EQUAL, Operation.GT_EQ) + .put(SqlKind.EQUALS, Operation.EQ) + .put(SqlKind.NOT_EQUALS, Operation.NOT_EQ) + .put(SqlKind.IN, Operation.IN) + .put(SqlKind.NOT_IN, Operation.NOT_IN) + .put(SqlKind.AND, Operation.AND) + .put(SqlKind.OR, Operation.OR) + .build(); + + static FilterFunction filterOn(Expression expression, Schema schema) { + return new FilterFunction(expression, schema); + } + + static class FilterFunction { + private final Evaluator evaluator; + + FilterFunction(Expression expression, Schema schema) { + this.evaluator = new Evaluator(schema.asStruct(), expression); + } + + boolean filter(Record rec) { + return evaluator.eval(rec); + } + } + + static Expression convert(@Nullable String filter, Schema schema) { + if (filter == null) { + return Expressions.alwaysTrue(); + } + + SqlParser parser = SqlParser.create(filter); + try { + SqlNode expression = parser.parseExpression(); + return convert(expression, schema); + } catch (Exception exception) { + throw new RuntimeException( + String.format("Encountered an error when parsing filter: '%s'", filter), exception); + } + } + + private static Expression convert(SqlNode expression, Schema schema) throws SqlParseException { Review Comment: Sent a message over to their dev slack chat ([thread](https://apache-iceberg.slack.com/archives/C03LG1D563F/p1746547273367289)) -- This is an automated message from the Apache Git Service. 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