strongduanmu commented on code in PR #20257: URL: https://github.com/apache/shardingsphere/pull/20257#discussion_r1002860735
########## infra/binder/src/main/java/org/apache/shardingsphere/infra/binder/statement/dml/OracleSelectStatementContextDialect.java: ########## @@ -0,0 +1,110 @@ +/* + * 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.shardingsphere.infra.binder.statement.dml; + +import java.util.Collection; +import java.util.Optional; + +import org.apache.shardingsphere.infra.binder.segment.select.groupby.GroupByContext; +import org.apache.shardingsphere.infra.binder.segment.select.orderby.OrderByContext; +import org.apache.shardingsphere.infra.binder.segment.select.projection.ProjectionsContext; +import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.column.ColumnSegment; +import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.BinaryOperationExpression; +import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.ExpressionSegment; +import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.predicate.WhereSegment; +import org.apache.shardingsphere.sql.parser.sql.dialect.statement.oracle.dml.OracleSelectStatement; + +/** + * Oracle Select SQL statement context dialect. + */ +public final class OracleSelectStatementContextDialect implements SelectStatementContextDialect { Review Comment: Can logic from OracleSelectStatementContextDialect be merged into SelectStatementContext ? ########## infra/binder/src/main/java/org/apache/shardingsphere/infra/binder/segment/select/projection/ProjectionUtil.java: ########## @@ -0,0 +1,45 @@ +/* + * 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.shardingsphere.infra.binder.segment.select.projection; + +import java.util.Collection; +import java.util.LinkedList; + +import org.apache.shardingsphere.infra.binder.segment.select.projection.impl.DerivedProjection; +import org.apache.shardingsphere.infra.binder.segment.select.projection.impl.ShorthandProjection; + +/** + * projection util. + */ +public class ProjectionUtil { + + /** + * expand projection, such as ShorthandProjection. + * @param projection the projection to expand + * @return expanded projections + */ + public static Collection<Projection> expandProjection(final Projection projection) { Review Comment: Can we get expand projections by projection context? ########## infra/binder/src/test/java/org/apache/shardingsphere/infra/binder/statement/impl/SelectStatementContextTest.java: ########## @@ -602,4 +604,33 @@ private ProjectionSegment getColumnProjectionSegmentWithoutOwner(final boolean h columnProjectionSegment.setAlias(new AliasSegment(0, 0, new IdentifierValue(hasAlias ? "n" : null))); return columnProjectionSegment; } + + @Test + public void assertGroupbyWithPagingForOracle() { + // select rownum , city, count(1) from t_user group by city + ProjectionsSegment innerProjections = new ProjectionsSegment(0, 0); + ColumnProjectionSegment rownumProjectionSegment = new ColumnProjectionSegment(new ColumnSegment(0, 0, new IdentifierValue("ROWNUM"))); + rownumProjectionSegment.setAlias(new AliasSegment(0, 0, new IdentifierValue("pagerow_"))); + innerProjections.getProjections().add(rownumProjectionSegment); + ColumnSegment cityColumnSegment = new ColumnSegment(0, 0, new IdentifierValue("city")); + innerProjections.getProjections().add(new ColumnProjectionSegment(cityColumnSegment)); + innerProjections.getProjections().add(new AggregationProjectionSegment(0, 0, AggregationType.COUNT, "(1)")); + OracleSelectStatement innerSelectStatement = new OracleSelectStatement(); + innerSelectStatement.setProjections(innerProjections); + innerSelectStatement.setFrom(new SimpleTableSegment(new TableNameSegment(0, 0, new IdentifierValue("t_user")))); + innerSelectStatement.setGroupBy(new GroupBySegment(0, 0, Arrays.asList(new ColumnOrderByItemSegment(cityColumnSegment, OrderDirection.ASC)))); + Review Comment: Please remove this useless black line. ########## infra/binder/src/main/java/org/apache/shardingsphere/infra/binder/statement/dml/SelectStatementContextDialect.java: ########## @@ -0,0 +1,52 @@ +/* + * 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.shardingsphere.infra.binder.statement.dml; + +import org.apache.shardingsphere.infra.binder.segment.select.groupby.GroupByContext; +import org.apache.shardingsphere.infra.binder.segment.select.orderby.OrderByContext; +import org.apache.shardingsphere.infra.binder.segment.select.projection.ProjectionsContext; + +/** + * Select SQL statement context dialect. + */ +public interface SelectStatementContextDialect { + + /** + * update GroupbyContext. + * @param groupByContext groupByContext + */ + default void updateGroupbyContext(final GroupByContext groupByContext) { + Review Comment: Please remove useless blank line. -- This is an automated message from the Apache Git Service. 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