Re: [PR] CAY-2842 Prevent duplicate select columns when using distinct with order by [cayenne]
stariy95 commented on code in PR #605:
URL: https://github.com/apache/cayenne/pull/605#discussion_r1516153957
##
cayenne/src/main/java/org/apache/cayenne/access/translator/select/OrderingAbstractStage.java:
##
@@ -0,0 +1,107 @@
+/*
+ * 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
+ *
+ *https://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.cayenne.access.translator.select;
+
+import static org.apache.cayenne.access.sqlbuilder.SQLBuilder.*;
+
+import java.util.function.Predicate;
+
+import org.apache.cayenne.access.sqlbuilder.NodeBuilder;
+import org.apache.cayenne.access.sqlbuilder.SQLGenerationVisitor;
+import org.apache.cayenne.access.sqlbuilder.StringBuilderAppendable;
+import org.apache.cayenne.access.sqlbuilder.sqltree.ColumnNode;
+import org.apache.cayenne.access.sqlbuilder.sqltree.FunctionNode;
+import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
+import org.apache.cayenne.access.sqlbuilder.sqltree.NodeType;
+import org.apache.cayenne.access.sqlbuilder.sqltree.SelectResultNode;
+import org.apache.cayenne.access.sqlbuilder.sqltree.SimpleNodeTreeVisitor;
+import org.apache.cayenne.exp.Expression;
+import org.apache.cayenne.exp.parser.ASTAggregateFunctionCall;
+import org.apache.cayenne.map.DbAttribute;
+import org.apache.cayenne.query.Ordering;
+
+abstract class OrderingAbstractStage implements TranslationStage {
+
+protected void processOrdering(QualifierTranslator qualifierTranslator,
TranslatorContext context, Ordering ordering) {
+Expression orderExp = ordering.getSortSpec();
+NodeBuilder nodeBuilder =
node(qualifierTranslator.translate(orderExp));
+
+if(ordering.isCaseInsensitive()) {
+nodeBuilder = function("UPPER", nodeBuilder);
+}
+
+// If query is DISTINCT or GROUPING then we need to add the order
column as a result column
+if (orderColumnAbsent(context, nodeBuilder)) {
+// deepCopy as some DB expect exactly the same expression in
select and in ordering
+ResultNodeDescriptor descriptor =
context.addResultNode(nodeBuilder.build().deepCopy());
+if(orderExp instanceof ASTAggregateFunctionCall) {
+descriptor.setAggregate(true);
+}
+}
+}
+
+private DbAttribute getOrderDbAttribute(Node translatedOrderNode)
+{
+DbAttribute[] orderDbAttribute = {null};
+translatedOrderNode.visit(new SimpleNodeTreeVisitor() {
+@Override
+public boolean onNodeStart(Node node) {
+if (node.getType() == NodeType.COLUMN) {
+orderDbAttribute[0] = ((ColumnNode) node).getAttribute();
+return false;
+}
+return true;
+}
+});
+return orderDbAttribute[0];
+}
+
+private boolean orderColumnAbsent(TranslatorContext context, NodeBuilder
nodeBuilder)
+{
+var orderDbAttribute = getOrderDbAttribute(nodeBuilder.build());
+if (orderDbAttribute == null) return false; // Alias ?
+
+var orderEntity = orderDbAttribute.getEntity().getName();
+var orderColumn = orderDbAttribute.getName();
+
+Predicate columnAndEntity = dba -> dba != null
+&& orderColumn.equals(dba.getName())
+&&
orderEntity.equals(dba.getEntity().getName());
+
+var orderStr = getSqlString(order(nodeBuilder));
+
+return context.getResultNodeList().stream()
+.filter( result -> columnAndEntity.test(result.getDbAttribute()) )
+.noneMatch( result ->
getSqlString(node(result.getNode())).startsWith(orderStr) );
Review Comment:
Thank you! I've seen it but unfortunately didn't have time to review it.
Hope will get some free time to check it out in the next few days.
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Re: [PR] CAY-2842 Prevent duplicate select columns when using distinct with order by [cayenne]
Jugen commented on code in PR #605:
URL: https://github.com/apache/cayenne/pull/605#discussion_r1516017214
##
cayenne/src/main/java/org/apache/cayenne/access/translator/select/OrderingAbstractStage.java:
##
@@ -0,0 +1,107 @@
+/*
+ * 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
+ *
+ *https://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.cayenne.access.translator.select;
+
+import static org.apache.cayenne.access.sqlbuilder.SQLBuilder.*;
+
+import java.util.function.Predicate;
+
+import org.apache.cayenne.access.sqlbuilder.NodeBuilder;
+import org.apache.cayenne.access.sqlbuilder.SQLGenerationVisitor;
+import org.apache.cayenne.access.sqlbuilder.StringBuilderAppendable;
+import org.apache.cayenne.access.sqlbuilder.sqltree.ColumnNode;
+import org.apache.cayenne.access.sqlbuilder.sqltree.FunctionNode;
+import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
+import org.apache.cayenne.access.sqlbuilder.sqltree.NodeType;
+import org.apache.cayenne.access.sqlbuilder.sqltree.SelectResultNode;
+import org.apache.cayenne.access.sqlbuilder.sqltree.SimpleNodeTreeVisitor;
+import org.apache.cayenne.exp.Expression;
+import org.apache.cayenne.exp.parser.ASTAggregateFunctionCall;
+import org.apache.cayenne.map.DbAttribute;
+import org.apache.cayenne.query.Ordering;
+
+abstract class OrderingAbstractStage implements TranslationStage {
+
+protected void processOrdering(QualifierTranslator qualifierTranslator,
TranslatorContext context, Ordering ordering) {
+Expression orderExp = ordering.getSortSpec();
+NodeBuilder nodeBuilder =
node(qualifierTranslator.translate(orderExp));
+
+if(ordering.isCaseInsensitive()) {
+nodeBuilder = function("UPPER", nodeBuilder);
+}
+
+// If query is DISTINCT or GROUPING then we need to add the order
column as a result column
+if (orderColumnAbsent(context, nodeBuilder)) {
+// deepCopy as some DB expect exactly the same expression in
select and in ordering
+ResultNodeDescriptor descriptor =
context.addResultNode(nodeBuilder.build().deepCopy());
+if(orderExp instanceof ASTAggregateFunctionCall) {
+descriptor.setAggregate(true);
+}
+}
+}
+
+private DbAttribute getOrderDbAttribute(Node translatedOrderNode)
+{
+DbAttribute[] orderDbAttribute = {null};
+translatedOrderNode.visit(new SimpleNodeTreeVisitor() {
+@Override
+public boolean onNodeStart(Node node) {
+if (node.getType() == NodeType.COLUMN) {
+orderDbAttribute[0] = ((ColumnNode) node).getAttribute();
+return false;
+}
+return true;
+}
+});
+return orderDbAttribute[0];
+}
+
+private boolean orderColumnAbsent(TranslatorContext context, NodeBuilder
nodeBuilder)
+{
+var orderDbAttribute = getOrderDbAttribute(nodeBuilder.build());
+if (orderDbAttribute == null) return false; // Alias ?
+
+var orderEntity = orderDbAttribute.getEntity().getName();
+var orderColumn = orderDbAttribute.getName();
+
+Predicate columnAndEntity = dba -> dba != null
+&& orderColumn.equals(dba.getName())
+&&
orderEntity.equals(dba.getEntity().getName());
+
+var orderStr = getSqlString(order(nodeBuilder));
+
+return context.getResultNodeList().stream()
+.filter( result -> columnAndEntity.test(result.getDbAttribute()) )
+.noneMatch( result ->
getSqlString(node(result.getNode())).startsWith(orderStr) );
Review Comment:
@stariy95 Have submitted PR #610 (ready for review) against
[CAY-2847](https://issues.apache.org/jira/browse/CAY-2847) to address this.
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