private FromElement createCollectionJoin(JoinSequence collectionJoinSequence, String tableAlias)
throws SemanticException {
String text = queryableCollection.getTableName();
AST ast = createFromElement(text);
FromElement destination = (FromElement) ast;
Type elementType = queryableCollection.getElementType();
if (elementType.isCollectionType()) {
throw new SemanticException("Collections of collections are not supported!");
}
destination.initializeCollection(fromClause, classAlias, tableAlias);
destination.setType(JOIN_FRAGMENT); // Tag this node as a JOIN.
destination.setIncludeSubclasses(false); // Don't include subclasses in the join.
destination.setCollectionJoin(true); // This is a clollection join.
destination.setJoinSequence(collectionJoinSequence);
destination.setOrigin(origin, false);
destination.setCollectionTableAlias(tableAlias);
// origin.addDestination( destination );
// This was the cause of HHH-242
// origin.setType( FROM_FRAGMENT ); // Set the parent node type so that the AST is properly
// formed.
origin.setText(""); // The destination node will have all the FROM text.
origin.setCollectionJoin(
true); // The parent node is a collection join too (voodoo - see JoinProcessor)
fromClause.addCollectionJoinFromElementByPath(path, destination);
fromClause.getWalker().addQuerySpaces(queryableCollection.getCollectionSpaces());
return destination;
}
public void resolveCollectionProperty(AST expr) throws SemanticException {
String propertyName = CollectionProperties.getNormalizedPropertyName(getMethodName());
if (expr instanceof FromReferenceNode) {
FromReferenceNode collectionNode = (FromReferenceNode) expr;
// If this is 'elements' then create a new FROM element.
if (CollectionPropertyNames.COLLECTION_ELEMENTS.equals(propertyName)) {
handleElements(collectionNode, propertyName);
} else {
// Not elements(x)
fromElement = collectionNode.getFromElement();
setDataType(fromElement.getPropertyType(propertyName, propertyName));
selectColumns = fromElement.toColumns(fromElement.getTableAlias(), propertyName, inSelect);
}
if (collectionNode instanceof DotNode) {
prepareAnyImplicitJoins((DotNode) collectionNode);
}
if (!inSelect) {
fromElement.setText("");
fromElement.setUseWhereFragment(false);
}
prepareSelectColumns(selectColumns);
setText(selectColumns[0]);
setType(SqlTokenTypes.SQL_TOKEN);
} else {
throw new SemanticException(
"Unexpected expression " + expr + " found for collection function " + propertyName);
}
}
private FromElement createManyToMany(
String role,
String associatedEntityName,
String roleAlias,
Queryable entityPersister,
EntityType type,
int joinType)
throws SemanticException {
FromElement elem;
SessionFactoryHelper sfh = fromClause.getSessionFactoryHelper();
if (inElementsFunction /*implied*/) {
// For implied many-to-many, just add the end join.
JoinSequence joinSequence = createJoinSequence(roleAlias, joinType);
elem = createJoin(associatedEntityName, roleAlias, joinSequence, type, true);
} else {
// For an explicit many-to-many relationship, add a second join from the intermediate
// (many-to-many) table to the destination table. Also, make sure that the from element's
// idea of the destination is the destination table.
String tableAlias =
fromClause.getAliasGenerator().createName(entityPersister.getEntityName());
String[] secondJoinColumns = sfh.getCollectionElementColumns(role, roleAlias);
// Add the second join, the one that ends in the destination table.
JoinSequence joinSequence = createJoinSequence(roleAlias, joinType);
joinSequence.addJoin(
sfh.getElementAssociationType(collectionType), tableAlias, joinType, secondJoinColumns);
elem = createJoin(associatedEntityName, tableAlias, joinSequence, type, false);
elem.setUseFromFragment(true);
}
return elem;
}
private boolean isReturnableEntity(SelectExpression selectExpression) throws SemanticException {
FromElement fromElement = selectExpression.getFromElement();
boolean isFetchOrValueCollection =
fromElement != null
&& (fromElement.isFetch() || fromElement.isCollectionOfValuesOrComponents());
if (isFetchOrValueCollection) {
return false;
} else {
return selectExpression.isReturnableEntity();
}
}
/**
* Prepares a derived (i.e., not explicitly defined in the query) select clause.
*
* @param fromClause The from clause to which this select clause is linked.
*/
public void initializeDerivedSelectClause(FromClause fromClause) throws SemanticException {
if (prepared) {
throw new IllegalStateException("SelectClause was already prepared!");
}
// Used to be tested by the TCK but the test is no longer here
// if ( getSessionFactoryHelper().isStrictJPAQLComplianceEnabled() && !getWalker().isSubQuery()
// ) {
// // NOTE : the isSubQuery() bit is a temporary hack...
// throw new QuerySyntaxException( "JPA-QL compliance requires select clause" );
// }
List fromElements = fromClause.getProjectionList();
ASTAppender appender =
new ASTAppender(getASTFactory(), this); // Get ready to start adding nodes.
int size = fromElements.size();
ArrayList queryReturnTypeList = new ArrayList(size);
Iterator iterator = fromElements.iterator();
for (int k = 0; iterator.hasNext(); k++) {
FromElement fromElement = (FromElement) iterator.next();
Type type = fromElement.getSelectType();
addCollectionFromElement(fromElement);
if (type != null) {
boolean collectionOfElements = fromElement.isCollectionOfValuesOrComponents();
if (!collectionOfElements) {
if (!fromElement.isFetch()) {
// Add the type to the list of returned sqlResultTypes.
queryReturnTypeList.add(type);
}
fromElementsForLoad.add(fromElement);
// Generate the select expression.
String text = fromElement.renderIdentifierSelect(size, k);
SelectExpressionImpl generatedExpr =
(SelectExpressionImpl) appender.append(SqlTokenTypes.SELECT_EXPR, text, false);
if (generatedExpr != null) {
generatedExpr.setFromElement(fromElement);
}
}
}
}
// Get all the select expressions (that we just generated) and render the select.
SelectExpression[] selectExpressions = collectSelectExpressions();
if (getWalker().isShallowQuery()) {
renderScalarSelects(selectExpressions, fromClause);
} else {
renderNonScalarSelects(selectExpressions, fromClause);
}
finishInitialization(queryReturnTypeList);
}
private void prepareAnyImplicitJoins(DotNode dotNode) throws SemanticException {
if (dotNode.getLhs() instanceof DotNode) {
DotNode lhs = (DotNode) dotNode.getLhs();
FromElement lhsOrigin = lhs.getFromElement();
if (lhsOrigin != null && "".equals(lhsOrigin.getText())) {
String lhsOriginText =
lhsOrigin.getQueryable().getTableName() + " " + lhsOrigin.getTableAlias();
lhsOrigin.setText(lhsOriginText);
}
prepareAnyImplicitJoins(lhs);
}
}
void registerFromElement(FromElement element) {
fromElements.add(element);
String classAlias = element.getClassAlias();
if (classAlias != null) {
// The HQL class alias refers to the class name.
fromElementByClassAlias.put(classAlias, element);
}
// Associate the table alias with the element.
String tableAlias = element.getTableAlias();
if (tableAlias != null) {
fromElementByTableAlias.put(tableAlias, element);
}
}
private FromElement initializeJoin(
String path,
FromElement destination,
JoinSequence joinSequence,
String[] columns,
FromElement origin,
boolean manyToMany) {
destination.setType(JOIN_FRAGMENT);
destination.setJoinSequence(joinSequence);
destination.setColumns(columns);
destination.setOrigin(origin, manyToMany);
fromClause.addJoinByPathMap(path, destination);
return destination;
}
private void typeDiscriminator(AST path) throws SemanticException {
if (path == null) {
throw new SemanticException("type() discriminator reference has no path!");
}
FromReferenceNode pathAsFromReferenceNode = (FromReferenceNode) path;
FromElement fromElement = pathAsFromReferenceNode.getFromElement();
TypeDiscriminatorMetadata typeDiscriminatorMetadata =
fromElement.getTypeDiscriminatorMetadata();
setDataType(typeDiscriminatorMetadata.getResolutionType());
setText(typeDiscriminatorMetadata.getSqlFragment());
setType(SqlTokenTypes.SQL_TOKEN);
}
FromElement createCollection(
QueryableCollection queryableCollection,
String role,
int joinType,
boolean fetchFlag,
boolean indexed)
throws SemanticException {
if (!collection) {
throw new IllegalStateException("FromElementFactory not initialized for collections!");
}
this.inElementsFunction = indexed;
FromElement elem;
this.queryableCollection = queryableCollection;
collectionType = queryableCollection.getCollectionType();
String roleAlias = fromClause.getAliasGenerator().createName(role);
// Correlated subqueries create 'special' implied from nodes
// because correlated subselects can't use an ANSI-style join
boolean explicitSubqueryFromElement = fromClause.isSubQuery() && !implied;
if (explicitSubqueryFromElement) {
String pathRoot = StringHelper.root(path);
FromElement origin = fromClause.getFromElement(pathRoot);
if (origin == null || origin.getFromClause() != fromClause) {
implied = true;
}
}
// super-duper-classic-parser-regression-testing-mojo-magic...
if (explicitSubqueryFromElement && DotNode.useThetaStyleImplicitJoins) {
implied = true;
}
Type elementType = queryableCollection.getElementType();
if (elementType.isEntityType()) { // A collection of entities...
elem = createEntityAssociation(role, roleAlias, joinType);
} else if (elementType.isComponentType()) { // A collection of components...
JoinSequence joinSequence = createJoinSequence(roleAlias, joinType);
elem = createCollectionJoin(joinSequence, roleAlias);
} else { // A collection of scalar elements...
JoinSequence joinSequence = createJoinSequence(roleAlias, joinType);
elem = createCollectionJoin(joinSequence, roleAlias);
}
elem.setRole(role);
elem.setQueryableCollection(queryableCollection);
// Don't include sub-classes for implied collection joins or subquery joins.
if (implied) {
elem.setIncludeSubclasses(false);
}
if (explicitSubqueryFromElement) {
elem.setInProjectionList(true); // Treat explict from elements in sub-queries properly.
}
if (fetchFlag) {
elem.setFetch(true);
}
return elem;
}
private void addCollectionFromElement(FromElement fromElement) {
if (fromElement.isFetch()) {
if (fromElement.getQueryableCollection() != null) {
String suffix;
if (collectionFromElements == null) {
collectionFromElements = new ArrayList();
suffix = VERSION2_SQL ? "__" : "0__";
} else {
suffix = Integer.toString(collectionFromElements.size()) + "__";
}
collectionFromElements.add(fromElement);
fromElement.setCollectionSuffix(suffix);
}
}
}
private FromElement createEntityAssociation(String role, String roleAlias, int joinType)
throws SemanticException {
FromElement elem;
Queryable entityPersister = (Queryable) queryableCollection.getElementPersister();
String associatedEntityName = entityPersister.getEntityName();
// Get the class name of the associated entity.
if (queryableCollection.isOneToMany()) {
if (log.isDebugEnabled()) {
log.debug(
"createEntityAssociation() : One to many - path = "
+ path
+ " role = "
+ role
+ " associatedEntityName = "
+ associatedEntityName);
}
JoinSequence joinSequence = createJoinSequence(roleAlias, joinType);
elem =
createJoin(
associatedEntityName,
roleAlias,
joinSequence,
(EntityType) queryableCollection.getElementType(),
false);
} else {
if (log.isDebugEnabled()) {
log.debug(
"createManyToMany() : path = "
+ path
+ " role = "
+ role
+ " associatedEntityName = "
+ associatedEntityName);
}
elem =
createManyToMany(
role,
associatedEntityName,
roleAlias,
entityPersister,
(EntityType) queryableCollection.getElementType(),
joinType);
fromClause.getWalker().addQuerySpaces(queryableCollection.getCollectionSpaces());
}
elem.setCollectionTableAlias(roleAlias);
return elem;
}
private void renderNonScalarIdentifiers(
FromElement fromElement,
int nonscalarSize,
int j,
SelectExpression expr,
ASTAppender appender) {
String text = fromElement.renderIdentifierSelect(nonscalarSize, j);
if (!fromElement.getFromClause().isSubQuery()) {
if (!scalarSelect && !getWalker().isShallowQuery()) {
// TODO: is this a bit ugly?
expr.setText(text);
} else {
appender.append(SqlTokenTypes.SQL_TOKEN, text, false);
}
}
}
private void handleElements(FromReferenceNode collectionNode, String propertyName) {
FromElement collectionFromElement = collectionNode.getFromElement();
QueryableCollection queryableCollection = collectionFromElement.getQueryableCollection();
String path = collectionNode.getPath() + "[]." + propertyName;
log.debug("Creating elements for " + path);
fromElement = collectionFromElement;
if (!collectionFromElement.isCollectionOfValuesOrComponents()) {
getWalker().addQuerySpaces(queryableCollection.getElementPersister().getQuerySpaces());
}
setDataType(queryableCollection.getElementType());
selectColumns =
collectionFromElement.toColumns(fromElement.getTableAlias(), propertyName, inSelect);
}
public String getDisplayText() {
return "{"
+ "method="
+ getMethodName()
+ ",selectColumns="
+ (selectColumns == null ? null : Arrays.asList(selectColumns))
+ ",fromElement="
+ fromElement.getTableAlias()
+ "}";
}
private FromElement createFromElementInSubselect(
String path, String pathAlias, FromElement parentFromElement, String classAlias)
throws SemanticException {
if (log.isDebugEnabled()) {
log.debug("createFromElementInSubselect() : path = " + path);
}
// Create an DotNode AST for the path and resolve it.
FromElement fromElement = evaluateFromElementPath(path, classAlias);
EntityPersister entityPersister = fromElement.getEntityPersister();
// If the first identifier in the path referrs to the class alias (not the class name), then
// this
// is a correlated subselect. If it's a correlated sub-select, use the existing table alias.
// Otherwise
// generate a new one.
String tableAlias = null;
boolean correlatedSubselect = pathAlias.equals(parentFromElement.getClassAlias());
if (correlatedSubselect) {
tableAlias = fromElement.getTableAlias();
} else {
tableAlias = null;
}
// If the from element isn't in the same clause, create a new from element.
if (fromElement.getFromClause() != fromClause) {
if (log.isDebugEnabled()) {
log.debug("createFromElementInSubselect() : creating a new FROM element...");
}
fromElement = createFromElement(entityPersister);
initializeAndAddFromElement(
fromElement,
path,
classAlias,
entityPersister,
(EntityType) ((Queryable) entityPersister).getType(),
tableAlias);
}
if (log.isDebugEnabled()) {
log.debug("createFromElementInSubselect() : " + path + " -> " + fromElement);
}
return fromElement;
}
private void initializeAndAddFromElement(
FromElement element,
String className,
String classAlias,
EntityPersister entityPersister,
EntityType type,
String tableAlias) {
if (tableAlias == null) {
AliasGenerator aliasGenerator = fromClause.getAliasGenerator();
tableAlias = aliasGenerator.createName(entityPersister.getEntityName());
}
element.initializeEntity(fromClause, className, entityPersister, type, classAlias, tableAlias);
}
FromElement createElementJoin(QueryableCollection queryableCollection) throws SemanticException {
FromElement elem;
implied =
true; // TODO: always true for now, but not if we later decide to support elements() in the
// from clause
inElementsFunction = true;
Type elementType = queryableCollection.getElementType();
if (!elementType.isEntityType()) {
throw new IllegalArgumentException(
"Cannot create element join for a collection of non-entities!");
}
this.queryableCollection = queryableCollection;
SessionFactoryHelper sfh = fromClause.getSessionFactoryHelper();
FromElement destination = null;
String tableAlias = null;
EntityPersister entityPersister = queryableCollection.getElementPersister();
tableAlias = fromClause.getAliasGenerator().createName(entityPersister.getEntityName());
String associatedEntityName = entityPersister.getEntityName();
EntityPersister targetEntityPersister = sfh.requireClassPersister(associatedEntityName);
// Create the FROM element for the target (the elements of the collection).
destination =
createAndAddFromElement(
associatedEntityName,
classAlias,
targetEntityPersister,
(EntityType) queryableCollection.getElementType(),
tableAlias);
// If the join is implied, then don't include sub-classes on the element.
if (implied) {
destination.setIncludeSubclasses(false);
}
fromClause.addCollectionJoinFromElementByPath(path, destination);
// origin.addDestination(destination);
// Add the query spaces.
fromClause.getWalker().addQuerySpaces(entityPersister.getQuerySpaces());
CollectionType type = queryableCollection.getCollectionType();
String role = type.getRole();
String roleAlias = origin.getTableAlias();
String[] targetColumns = sfh.getCollectionElementColumns(role, roleAlias);
AssociationType elementAssociationType = sfh.getElementAssociationType(type);
// Create the join element under the from element.
int joinType = JoinFragment.INNER_JOIN;
JoinSequence joinSequence =
sfh.createJoinSequence(
implied, elementAssociationType, tableAlias, joinType, targetColumns);
elem = initializeJoin(path, destination, joinSequence, targetColumns, origin, false);
elem.setUseFromFragment(
true); // The associated entity is implied, but it must be included in the FROM.
elem.setCollectionTableAlias(roleAlias); // The collection alias is the role.
return elem;
}
private void renderNonScalarProperties(
ASTAppender appender, FromElement fromElement, int nonscalarSize, int k) {
String text = fromElement.renderPropertySelect(nonscalarSize, k);
appender.append(SqlTokenTypes.SQL_TOKEN, text, false);
if (fromElement.getQueryableCollection() != null && fromElement.isFetch()) {
text = fromElement.renderCollectionSelectFragment(nonscalarSize, k);
appender.append(SqlTokenTypes.SQL_TOKEN, text, false);
}
// Look through the FromElement's children to find any collections of values that should be
// fetched...
ASTIterator iter = new ASTIterator(fromElement);
while (iter.hasNext()) {
FromElement child = (FromElement) iter.next();
if (child.isCollectionOfValuesOrComponents() && child.isFetch()) {
// Need a better way to define the suffixes here...
text = child.renderValueCollectionSelectFragment(nonscalarSize, nonscalarSize + k);
appender.append(SqlTokenTypes.SQL_TOKEN, text, false);
}
}
}
public boolean include(AST node) {
FromElement fromElement = (FromElement) node;
return fromElement.isFetch() && fromElement.getQueryableCollection() != null;
}
public boolean include(AST node) {
FromElement fromElement = (FromElement) node;
return fromElement.inProjectionList();
}
public boolean include(AST node) {
FromElement fromElement = (FromElement) node;
return fromElement.isFromOrJoinFragment();
}
public boolean include(AST node) {
final FromElement fromElement = (FromElement) node;
return !fromElement.isImplied();
}
FromElement createEntityJoin(
String entityClass,
String tableAlias,
JoinSequence joinSequence,
boolean fetchFlag,
boolean inFrom,
EntityType type)
throws SemanticException {
FromElement elem = createJoin(entityClass, tableAlias, joinSequence, type, false);
elem.setFetch(fetchFlag);
EntityPersister entityPersister = elem.getEntityPersister();
int numberOfTables = entityPersister.getQuerySpaces().length;
if (numberOfTables > 1 && implied && !elem.useFromFragment()) {
if (log.isDebugEnabled()) {
log.debug("createEntityJoin() : Implied multi-table entity join");
}
elem.setUseFromFragment(true);
}
// If this is an implied join in a FROM clause, then use ANSI-style joining, and set the
// flag on the FromElement that indicates that it was implied in the FROM clause itself.
if (implied && inFrom) {
joinSequence.setUseThetaStyle(false);
elem.setUseFromFragment(true);
elem.setImpliedInFromClause(true);
}
if (elem.getWalker().isSubQuery()) {
// two conditions where we need to transform this to a theta-join syntax:
// 1) 'elem' is the "root from-element" in correlated subqueries
// 2) The DotNode.useThetaStyleImplicitJoins has been set to true
// and 'elem' represents an implicit join
if (elem.getFromClause() != elem.getOrigin().getFromClause()
||
// ( implied && DotNode.useThetaStyleImplicitJoins ) ) {
DotNode.useThetaStyleImplicitJoins) {
// the "root from-element" in correlated subqueries do need this piece
elem.setType(FROM_FRAGMENT);
joinSequence.setUseThetaStyle(true);
elem.setUseFromFragment(false);
}
}
return elem;
}
/**
* Prepares an explicitly defined select clause.
*
* @param fromClause The from clause linked to this select clause.
* @throws SemanticException indicates a semntic issue with the explicit select clause.
*/
public void initializeExplicitSelectClause(FromClause fromClause) throws SemanticException {
if (prepared) {
throw new IllegalStateException("SelectClause was already prepared!");
}
// explicit = true; // This is an explict Select.
// ArrayList sqlResultTypeList = new ArrayList();
ArrayList queryReturnTypeList = new ArrayList();
// First, collect all of the select expressions.
// NOTE: This must be done *before* invoking setScalarColumnText() because setScalarColumnText()
// changes the AST!!!
SelectExpression[] selectExpressions = collectSelectExpressions();
// we only support parameters in select in the case of INSERT...SELECT statements
if (getParameterPositions().size() > 0
&& getWalker().getStatementType() != HqlSqlTokenTypes.INSERT) {
throw new QueryException(
"Parameters are only supported in SELECT clauses when used as part of a INSERT INTO DML statement");
}
for (int i = 0; i < selectExpressions.length; i++) {
SelectExpression selectExpression = selectExpressions[i];
if (AggregatedSelectExpression.class.isInstance(selectExpression)) {
aggregatedSelectExpression = (AggregatedSelectExpression) selectExpression;
queryReturnTypeList.addAll(aggregatedSelectExpression.getAggregatedSelectionTypeList());
scalarSelect = true;
} else {
// we have no choice but to do this check here
// this is not very elegant but the "right way" would most likely involve a bigger rewrite
// so as to
// treat ParameterNodes in select clauses as SelectExpressions
boolean inSubquery =
selectExpression instanceof QueryNode
&& ((QueryNode) selectExpression).getFromClause().getParentFromClause() != null;
if (getWalker().getStatementType() == HqlSqlTokenTypes.INSERT && inSubquery) {
// we do not support parameters for subqueries in INSERT...SELECT
if (((QueryNode) selectExpression).getSelectClause().getParameterPositions().size() > 0) {
throw new QueryException(
"Use of parameters in subqueries of INSERT INTO DML statements is not supported.");
}
}
Type type = selectExpression.getDataType();
if (type == null) {
throw new IllegalStateException(
"No data type for node: "
+ selectExpression.getClass().getName()
+ " "
+ new ASTPrinter(SqlTokenTypes.class).showAsString((AST) selectExpression, ""));
}
// sqlResultTypeList.add( type );
// If the data type is not an association type, it could not have been in the FROM clause.
if (selectExpression.isScalar()) {
scalarSelect = true;
}
if (isReturnableEntity(selectExpression)) {
fromElementsForLoad.add(selectExpression.getFromElement());
}
// Always add the type to the return type list.
queryReturnTypeList.add(type);
}
}
// init the aliases, after initing the constructornode
initAliases(selectExpressions);
if (!getWalker().isShallowQuery()) {
// add the fetched entities
List fromElements = fromClause.getProjectionList();
ASTAppender appender =
new ASTAppender(getASTFactory(), this); // Get ready to start adding nodes.
int size = fromElements.size();
Iterator iterator = fromElements.iterator();
for (int k = 0; iterator.hasNext(); k++) {
FromElement fromElement = (FromElement) iterator.next();
if (fromElement.isFetch()) {
FromElement origin = null;
if (fromElement.getRealOrigin() == null) {
// work around that crazy issue where the tree contains
// "empty" FromElements (no text); afaict, this is caused
// by FromElementFactory.createCollectionJoin()
if (fromElement.getOrigin() == null) {
throw new QueryException(
"Unable to determine origin of join fetch ["
+ fromElement.getDisplayText()
+ "]");
} else {
origin = fromElement.getOrigin();
}
} else {
origin = fromElement.getRealOrigin();
}
if (!fromElementsForLoad.contains(origin)) {
throw new QueryException(
"query specified join fetching, but the owner "
+ "of the fetched association was not present in the select list "
+ "["
+ fromElement.getDisplayText()
+ "]");
}
Type type = fromElement.getSelectType();
addCollectionFromElement(fromElement);
if (type != null) {
boolean collectionOfElements = fromElement.isCollectionOfValuesOrComponents();
if (!collectionOfElements) {
// Add the type to the list of returned sqlResultTypes.
fromElement.setIncludeSubclasses(true);
fromElementsForLoad.add(fromElement);
// sqlResultTypeList.add( type );
// Generate the select expression.
String text = fromElement.renderIdentifierSelect(size, k);
SelectExpressionImpl generatedExpr =
(SelectExpressionImpl) appender.append(SqlTokenTypes.SELECT_EXPR, text, false);
if (generatedExpr != null) {
generatedExpr.setFromElement(fromElement);
}
}
}
}
}
// generate id select fragment and then property select fragment for
// each expression, just like generateSelectFragments().
renderNonScalarSelects(collectSelectExpressions(), fromClause);
}
if (scalarSelect || getWalker().isShallowQuery()) {
// If there are any scalars (non-entities) selected, render the select column aliases.
renderScalarSelects(selectExpressions, fromClause);
}
finishInitialization(/*sqlResultTypeList,*/ queryReturnTypeList);
}
