HHH-15342 Inappropriate variation of HQL left join to SQL inner join
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@ -559,7 +559,12 @@ public class PluralAttributeMappingImpl
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SqlAstCreationContext creationContext) {
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final SqlAstJoinType joinType;
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if ( requestedJoinType == null ) {
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joinType = SqlAstJoinType.INNER;
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if ( fetched ) {
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joinType = getDefaultSqlAstJoinType( lhs );
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}
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else {
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joinType = SqlAstJoinType.INNER;
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}
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}
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else {
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joinType = requestedJoinType;
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@ -100,8 +100,6 @@ import org.hibernate.type.EmbeddedComponentType;
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import org.hibernate.type.EntityType;
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import org.hibernate.type.Type;
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import static java.util.Objects.requireNonNullElse;
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/**
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* @author Steve Ebersole
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*/
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@ -1221,9 +1219,8 @@ public class ToOneAttributeMapping
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having the left join we don't want to add an extra implicit join that will be translated into an SQL inner join (see HHH-15342)
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*/
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if ( ( ( hasNotFoundAction() && doesNotExistATableGroupJoin( parentTableGroup, fetchablePath ) )
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|| ( fetchTiming == FetchTiming.IMMEDIATE && selected ) ) ) {
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final TableGroup tableGroup = determineTableGroup(
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if ( fetchTiming == FetchTiming.IMMEDIATE && selected || hasNotFoundAction() ) {
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final TableGroup tableGroup = determineTableGroupForFetch(
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fetchablePath,
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fetchParent,
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parentTableGroup,
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@ -1332,58 +1329,66 @@ public class ToOneAttributeMapping
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);
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}
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private boolean doesNotExistATableGroupJoin(TableGroup parentTableGroup, NavigablePath fetchablePath) {
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for ( TableGroupJoin tableGroupJoin : parentTableGroup.getTableGroupJoins() ) {
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if ( tableGroupJoin.getNavigablePath().pathsMatch( fetchablePath ) ) {
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return false;
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}
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}
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return true;
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}
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private TableGroup determineTableGroup(NavigablePath fetchablePath, FetchParent fetchParent, TableGroup parentTableGroup, String resultVariable, FromClauseAccess fromClauseAccess, DomainResultCreationState creationState) {
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final TableGroup tableGroup;
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private TableGroup determineTableGroupForFetch(
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NavigablePath fetchablePath,
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FetchParent fetchParent,
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TableGroup parentTableGroup,
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String resultVariable,
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FromClauseAccess fromClauseAccess,
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DomainResultCreationState creationState) {
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final SqlAstJoinType joinType;
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if ( fetchParent instanceof EntityResultJoinedSubclassImpl
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&& ( (EntityPersister) fetchParent.getReferencedModePart() ).findDeclaredAttributeMapping( getPartName() ) == null ) {
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final TableGroupJoin tableGroupJoin = createTableGroupJoin(
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fetchablePath,
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parentTableGroup,
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resultVariable,
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getJoinType( fetchablePath, parentTableGroup ),
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true,
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false,
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creationState.getSqlAstCreationState()
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);
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if ( hasNotFoundAction() ) {
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tableGroupJoin.setImplicit();
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}
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parentTableGroup.addTableGroupJoin( tableGroupJoin );
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tableGroup = tableGroupJoin.getJoinedGroup();
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fromClauseAccess.registerTableGroup( fetchablePath, tableGroup );
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joinType = getJoinTypeForFetch( fetchablePath, parentTableGroup );
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}
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else {
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tableGroup = fromClauseAccess.resolveTableGroup(
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fetchablePath,
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np -> {
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final TableGroupJoin tableGroupJoin = createTableGroupJoin(
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fetchablePath,
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parentTableGroup,
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resultVariable,
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getDefaultSqlAstJoinType( parentTableGroup ),
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true,
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false,
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creationState.getSqlAstCreationState()
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);
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if ( hasNotFoundAction() ) {
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tableGroupJoin.setImplicit();
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}
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parentTableGroup.addTableGroupJoin( tableGroupJoin );
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return tableGroupJoin.getJoinedGroup();
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}
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);
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joinType = null;
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}
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return tableGroup;
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return fromClauseAccess.resolveTableGroup(
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fetchablePath,
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np -> {
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// Try to reuse an existing join if possible,
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// and note that we prefer reusing an inner over a left join,
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// because a left join might stay uninitialized if unused
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TableGroup leftJoined = null;
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for ( TableGroupJoin tableGroupJoin : parentTableGroup.getTableGroupJoins() ) {
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switch ( tableGroupJoin.getJoinType() ) {
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case INNER:
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// If this is an inner joins, it's fine if the paths match
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// Since this inner join would filter the parent row anyway,
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// it makes no sense to add another left join for this association
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if ( tableGroupJoin.getNavigablePath().pathsMatch( np ) ) {
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return tableGroupJoin.getJoinedGroup();
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}
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break;
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case LEFT:
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// For an existing left join on the other hand which is row preserving,
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// it is important to check if the predicate has user defined bits in it
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// and only if it doesn't, we can reuse the join
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if ( tableGroupJoin.getNavigablePath().pathsMatch( np )
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&& isSimpleJoinPredicate( tableGroupJoin.getPredicate() ) ) {
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leftJoined = tableGroupJoin.getJoinedGroup();
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}
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}
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}
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if ( leftJoined != null ) {
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return leftJoined;
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}
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final TableGroupJoin tableGroupJoin = createTableGroupJoin(
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fetchablePath,
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parentTableGroup,
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resultVariable,
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joinType,
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true,
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false,
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creationState.getSqlAstCreationState()
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);
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parentTableGroup.addTableGroupJoin( tableGroupJoin );
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return tableGroupJoin.getJoinedGroup();
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}
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);
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}
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private boolean isSelectByUniqueKey(ForeignKeyDescriptor.Nature side) {
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@ -1531,7 +1536,9 @@ public class ToOneAttributeMapping
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@Override
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public boolean isSimpleJoinPredicate(Predicate predicate) {
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return foreignKeyDescriptor.isSimpleJoinPredicate( predicate );
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// Since the table group is lazy, the initial predicate is null,
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// but if we get null here, we can safely assume this will be a simple join predicate
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return predicate == null || foreignKeyDescriptor.isSimpleJoinPredicate( predicate );
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}
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@Override
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@ -1555,7 +1562,18 @@ public class ToOneAttributeMapping
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// This is vital for the map key property check that comes next
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assert !( lhs instanceof PluralTableGroup );
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final SqlAstJoinType joinType = requireNonNullElse( requestedJoinType, SqlAstJoinType.INNER );
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final SqlAstJoinType joinType;
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if ( requestedJoinType == null ) {
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if ( fetched ) {
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joinType = getDefaultSqlAstJoinType( lhs );
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}
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else {
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joinType = SqlAstJoinType.INNER;
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}
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}
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else {
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joinType = requestedJoinType;
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}
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// If a parent is a collection part, there is no custom predicate and the join is INNER or LEFT
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// we check if this attribute is the map key property to reuse the existing index table group
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@ -1800,13 +1818,13 @@ public class ToOneAttributeMapping
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}
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}
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private SqlAstJoinType getJoinType(NavigablePath navigablePath, TableGroup tableGroup) {
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private SqlAstJoinType getJoinTypeForFetch(NavigablePath navigablePath, TableGroup tableGroup) {
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for ( TableGroupJoin tableGroupJoin : tableGroup.getTableGroupJoins() ) {
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if ( tableGroupJoin.getNavigablePath().equals( navigablePath ) ) {
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return tableGroupJoin.getJoinType();
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}
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}
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return getDefaultSqlAstJoinType( tableGroup );
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return null;
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}
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public TableGroup createTableGroupInternal(
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@ -3312,7 +3312,6 @@ public abstract class BaseSqmToSqlAstConverter<T extends Statement> extends Base
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false,
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this
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);
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tableGroupJoin.setImplicit();
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// Implicit joins in the ON clause of attribute joins need to be added as nested table group joins
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// We don't have to do that for entity joins etc. as these do not have an inherent dependency on the lhs.
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// We can just add the implicit join before the currently processing join
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@ -6987,7 +6986,7 @@ public abstract class BaseSqmToSqlAstConverter<T extends Statement> extends Base
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fetchablePath,
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lhs,
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alias,
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tableGroupJoinProducer.getDefaultSqlAstJoinType( lhs ),
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null,
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true,
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false,
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BaseSqmToSqlAstConverter.this
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@ -7,6 +7,7 @@
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package org.hibernate.query.sqm.sql.internal;
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import org.hibernate.NotYetImplementedFor6Exception;
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import org.hibernate.metamodel.mapping.CollectionPart;
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import org.hibernate.metamodel.mapping.PluralAttributeMapping;
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import org.hibernate.spi.NavigablePath;
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import org.hibernate.query.sqm.sql.SqmToSqlAstConverter;
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@ -60,7 +61,7 @@ public class PluralValuedSimplePathInterpretation<T> extends AbstractSqmPathInte
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// This is only invoked when a plural attribute is a top level select, order by or group by item
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// in which case we have to produce results for the element
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return ( (PluralAttributeMapping) getExpressionType() ).getElementDescriptor().createDomainResult(
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getNavigablePath(),
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getNavigablePath().append( CollectionPart.Nature.ELEMENT.getName() ),
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getTableGroup(),
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resultVariable,
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creationState
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@ -27,8 +27,6 @@ public class TableGroupJoin implements TableJoin, DomainResultProducer {
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private SqlAstJoinType joinType;
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private Predicate predicate;
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private boolean implicit;
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public TableGroupJoin(
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NavigablePath navigablePath,
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SqlAstJoinType joinType,
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@ -93,12 +91,8 @@ public class TableGroupJoin implements TableJoin, DomainResultProducer {
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return navigablePath;
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}
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public void setImplicit(){
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this.implicit = true;
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}
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public boolean isImplicit(){
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return implicit;
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public boolean isImplicit() {
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return !navigablePath.isAliased();
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}
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@Override
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