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Example 1 with CteContainer

use of org.hibernate.sql.ast.tree.cte.CteContainer in project hibernate-orm by hibernate.

the class CteInsertHandler method addDmlCtes.

protected String addDmlCtes(CteContainer statement, CteStatement queryCte, List<Map.Entry<SqmCteTableColumn, Assignment>> assignments, boolean assignsId, MultiTableSqmMutationConverter sqmConverter, Map<SqmParameter<?>, List<List<JdbcParameter>>> parameterResolutions, SessionFactoryImplementor factory) {
    final TableGroup updatingTableGroup = sqmConverter.getMutatingTableGroup();
    final EntityMappingType entityDescriptor = getEntityDescriptor();
    final EntityPersister entityPersister = entityDescriptor.getEntityPersister();
    final String rootEntityName = entityPersister.getRootEntityName();
    final EntityPersister rootEntityDescriptor = factory.getRuntimeMetamodels().getMappingMetamodel().getEntityDescriptor(rootEntityName);
    final String hierarchyRootTableName = ((Joinable) rootEntityDescriptor).getTableName();
    final TableReference hierarchyRootTableReference = updatingTableGroup.resolveTableReference(updatingTableGroup.getNavigablePath(), hierarchyRootTableName);
    assert hierarchyRootTableReference != null;
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // cross-reference the TableReference by alias.  The TableGroup already
    // cross-references it by name, but the ColumnReference only has the alias
    final Map<String, TableReference> tableReferenceByAlias = CollectionHelper.mapOfSize(updatingTableGroup.getTableReferenceJoins().size() + 1);
    collectTableReference(updatingTableGroup.getPrimaryTableReference(), tableReferenceByAlias::put);
    for (int i = 0; i < updatingTableGroup.getTableReferenceJoins().size(); i++) {
        collectTableReference(updatingTableGroup.getTableReferenceJoins().get(i), tableReferenceByAlias::put);
    }
    final Map<TableReference, List<Map.Entry<SqmCteTableColumn, Assignment>>> assignmentsByTable = CollectionHelper.mapOfSize(updatingTableGroup.getTableReferenceJoins().size() + 1);
    for (int i = 0; i < assignments.size(); i++) {
        final Map.Entry<SqmCteTableColumn, Assignment> entry = assignments.get(i);
        final Assignment assignment = entry.getValue();
        final List<ColumnReference> assignmentColumnRefs = assignment.getAssignable().getColumnReferences();
        TableReference assignmentTableReference = null;
        for (int c = 0; c < assignmentColumnRefs.size(); c++) {
            final ColumnReference columnReference = assignmentColumnRefs.get(c);
            final TableReference tableReference = resolveTableReference(columnReference, updatingTableGroup, tableReferenceByAlias);
            // TODO: this could be fixed by introducing joins to DML statements
            if (assignmentTableReference != null && !assignmentTableReference.equals(tableReference)) {
                throw new IllegalStateException("Assignment referred to columns from multiple tables");
            }
            assignmentTableReference = tableReference;
        }
        assert assignmentTableReference != null;
        List<Map.Entry<SqmCteTableColumn, Assignment>> assignmentsForTable = assignmentsByTable.get(assignmentTableReference);
        if (assignmentsForTable == null) {
            assignmentsForTable = new ArrayList<>();
            assignmentsByTable.put(assignmentTableReference, assignmentsForTable);
        }
        assignmentsForTable.add(entry);
    }
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // Add the root insert as cte
    final AbstractEntityPersister persister = (AbstractEntityPersister) entityDescriptor.getEntityPersister();
    final String rootTableName = persister.getTableName(0);
    final TableReference rootTableReference = updatingTableGroup.getTableReference(updatingTableGroup.getNavigablePath(), rootTableName, true, true);
    final IdentifierGenerator identifierGenerator = entityDescriptor.getEntityPersister().getIdentifierGenerator();
    final List<Map.Entry<SqmCteTableColumn, Assignment>> tableAssignments = assignmentsByTable.get(rootTableReference);
    if ((tableAssignments == null || tableAssignments.isEmpty()) && !(identifierGenerator instanceof PostInsertIdentifierGenerator)) {
        throw new IllegalStateException("There must be at least a single root table assignment");
    }
    final int tableSpan = persister.getTableSpan();
    final String[] rootKeyColumns = persister.getKeyColumns(0);
    final List<CteColumn> keyCteColumns = queryCte.getCteTable().getCteColumns().subList(0, rootKeyColumns.length);
    for (int i = 0; i < tableSpan; i++) {
        final String tableExpression = persister.getTableName(i);
        final TableReference updatingTableReference = updatingTableGroup.getTableReference(updatingTableGroup.getNavigablePath(), tableExpression, true, true);
        final List<Map.Entry<SqmCteTableColumn, Assignment>> assignmentList = assignmentsByTable.get(updatingTableReference);
        final NamedTableReference dmlTableReference = resolveUnionTableReference(updatingTableReference, tableExpression);
        final String[] keyColumns = persister.getKeyColumns(i);
        final List<ColumnReference> returningColumnReferences = new ArrayList<>(keyColumns.length + (assignmentList == null ? 0 : assignmentList.size()));
        final List<ColumnReference> insertColumnReferences;
        final QuerySpec insertSelectSpec = new QuerySpec(true);
        CteStatement finalCteStatement = null;
        final CteTable dmlResultCte;
        if (i == 0 && !assignsId && identifierGenerator instanceof PostInsertIdentifierGenerator) {
            // Special handling for identity generation
            final String baseTableName = "base_" + queryCte.getCteTable().getTableExpression();
            insertSelectSpec.getFromClause().addRoot(new CteTableGroup(new NamedTableReference(baseTableName, "e", false, factory)));
            final CteColumn rowNumberColumn = queryCte.getCteTable().getCteColumns().get(queryCte.getCteTable().getCteColumns().size() - 1);
            final ColumnReference rowNumberColumnReference = new ColumnReference("e", rowNumberColumn.getColumnExpression(), false, null, null, rowNumberColumn.getJdbcMapping(), factory);
            // Insert in the same order as the original tuples came
            insertSelectSpec.addSortSpecification(new SortSpecification(rowNumberColumnReference, SortOrder.ASCENDING));
            final List<CteColumn> returningColumns = new ArrayList<>(keyCteColumns.size() + 1);
            returningColumns.addAll(keyCteColumns);
            dmlResultCte = new CteTable(getCteTableName(tableExpression, "base_"), returningColumns, factory);
            for (int j = 0; j < keyColumns.length; j++) {
                returningColumnReferences.add(new ColumnReference(dmlTableReference, keyColumns[j], false, null, null, null, factory));
            }
            insertColumnReferences = Collections.emptyList();
            final SelectStatement queryStatement = (SelectStatement) queryCte.getCteDefinition();
            final QuerySpec querySpec = queryStatement.getQuerySpec();
            final NavigablePath navigablePath = new NavigablePath(baseTableName);
            final TableGroup baseTableGroup = new TableGroupImpl(navigablePath, null, new NamedTableReference(baseTableName, "e", false, factory), null);
            final TableGroup rootInsertCteTableGroup = new CteTableGroup(new NamedTableReference(getCteTableName(tableExpression), "t", false, factory));
            baseTableGroup.addTableGroupJoin(new TableGroupJoin(rootInsertCteTableGroup.getNavigablePath(), SqlAstJoinType.INNER, rootInsertCteTableGroup, new ComparisonPredicate(rowNumberColumnReference, ComparisonOperator.EQUAL, new ColumnReference("t", rowNumberColumn.getColumnExpression(), false, null, null, rowNumberColumn.getJdbcMapping(), factory))));
            querySpec.getFromClause().addRoot(baseTableGroup);
            final List<CteColumn> cteColumns = queryCte.getCteTable().getCteColumns();
            // The id column in this case comes from the dml CTE
            final CteColumn idCteColumn = cteColumns.get(0);
            querySpec.getSelectClause().addSqlSelection(new SqlSelectionImpl(1, 0, new ColumnReference("t", idCteColumn.getColumnExpression(), false, null, null, idCteColumn.getJdbcMapping(), factory)));
            // The other columns come from the base CTE
            for (int j = 1; j < cteColumns.size(); j++) {
                final CteColumn cteColumn = cteColumns.get(j);
                querySpec.getSelectClause().addSqlSelection(new SqlSelectionImpl(1, 0, new ColumnReference("e", cteColumn.getColumnExpression(), false, null, null, cteColumn.getJdbcMapping(), factory)));
            }
            // Now build the final CTE statement
            final List<CteColumn> finalReturningColumns = new ArrayList<>(keyCteColumns.size() + 1);
            finalReturningColumns.addAll(keyCteColumns);
            finalReturningColumns.add(rowNumberColumn);
            final CteTable finalResultCte = new CteTable(getCteTableName(tableExpression), finalReturningColumns, factory);
            final QuerySpec finalResultQuery = new QuerySpec(true);
            finalResultQuery.getFromClause().addRoot(new CteTableGroup(new NamedTableReference(dmlResultCte.getTableExpression(), "e", false, factory)));
            // The id column in this case comes from the dml CTE
            final ColumnReference idColumnReference = new ColumnReference("e", idCteColumn.getColumnExpression(), false, null, null, idCteColumn.getJdbcMapping(), factory);
            finalResultQuery.getSelectClause().addSqlSelection(new SqlSelectionImpl(1, 0, idColumnReference));
            final BasicType<Integer> rowNumberType = sessionFactory.getTypeConfiguration().getBasicTypeForJavaType(Integer.class);
            finalResultQuery.getSelectClause().addSqlSelection(new SqlSelectionImpl(1, 0, new Over<>(new SelfRenderingFunctionSqlAstExpression("row_number", (appender, args, walker) -> appender.appendSql("row_number()"), Collections.emptyList(), rowNumberType, rowNumberType), Collections.emptyList(), Collections.emptyList())));
            finalResultQuery.addSortSpecification(new SortSpecification(idColumnReference, SortOrder.ASCENDING));
            final SelectStatement finalResultStatement = new SelectStatement(finalResultQuery);
            finalCteStatement = new CteStatement(finalResultCte, finalResultStatement);
        } else {
            insertSelectSpec.getFromClause().addRoot(new CteTableGroup(new NamedTableReference(queryCte.getCteTable().getTableExpression(), "e", false, factory)));
            dmlResultCte = new CteTable(getCteTableName(tableExpression), keyCteColumns, factory);
            for (int j = 0; j < keyColumns.length; j++) {
                returningColumnReferences.add(new ColumnReference(dmlTableReference, keyColumns[j], false, null, null, null, factory));
                insertSelectSpec.getSelectClause().addSqlSelection(new SqlSelectionImpl(1, 0, new ColumnReference("e", rootKeyColumns[j], false, null, null, null, factory)));
            }
            insertColumnReferences = returningColumnReferences;
        }
        final InsertStatement dmlStatement = new InsertStatement(dmlTableReference, returningColumnReferences);
        dmlStatement.addTargetColumnReferences(insertColumnReferences);
        if (assignmentList != null) {
            for (Map.Entry<SqmCteTableColumn, Assignment> entry : assignmentList) {
                final Assignment assignment = entry.getValue();
                // Skip the id mapping here as we handled that already
                if (assignment.getAssignedValue().getExpressionType() instanceof EntityIdentifierMapping) {
                    continue;
                }
                final List<ColumnReference> assignmentReferences = assignment.getAssignable().getColumnReferences();
                dmlStatement.addTargetColumnReferences(assignmentReferences);
                final int size = assignmentReferences.size();
                for (int j = 0; j < size; j++) {
                    final ColumnReference columnReference = assignmentReferences.get(j);
                    final String columnName = size > 1 ? entry.getKey().getColumnName() + '_' + i : entry.getKey().getColumnName();
                    insertSelectSpec.getSelectClause().addSqlSelection(new SqlSelectionImpl(1, 0, new ColumnReference("e", columnName, columnReference.isColumnExpressionFormula(), null, null, columnReference.getJdbcMapping(), factory)));
                }
            }
        }
        dmlStatement.setSourceSelectStatement(insertSelectSpec);
        statement.addCteStatement(new CteStatement(dmlResultCte, dmlStatement));
        if (finalCteStatement != null) {
            statement.addCteStatement(finalCteStatement);
        }
        if (i == 0 && !assignsId && identifierGenerator instanceof PostInsertIdentifierGenerator) {
            // Special handling for identity generation
            statement.addCteStatement(queryCte);
        }
    }
    return getCteTableName(rootTableName);
}
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Example 2 with CteContainer

use of org.hibernate.sql.ast.tree.cte.CteContainer in project hibernate-orm by hibernate.

the class AggregateWindowEmulationQueryTransformer method transform.

@Override
public QuerySpec transform(CteContainer cteContainer, QuerySpec querySpec, SqmToSqlAstConverter converter) {
    final SessionFactoryImplementor factory = converter.getCreationContext().getSessionFactory();
    final QuerySpec outerQuerySpec = new QuerySpec(querySpec.isRoot());
    final String identifierVariable = "hhh_";
    final NavigablePath navigablePath = new NavigablePath(identifierVariable, identifierVariable);
    final SelectClause selectClause = outerQuerySpec.getSelectClause();
    final QuerySpec subQuerySpec = querySpec.asSubQuery();
    final SelectClause subSelectClause = subQuerySpec.getSelectClause();
    final List<SqlSelection> subSelections = subSelectClause.getSqlSelections();
    final List<String> columnNames = new ArrayList<>(subSelections.size());
    // A map to find the select item position for an expression
    // which is needed to decide if we need to introduce synthetic select items
    // for group by items, since these group by items are migrated to the outer query
    final Map<Expression, Integer> selectionMapping = new HashMap<>(subSelections.size());
    // for the QueryPartTableGroup within which the sub query spec is embedded
    for (int i = 0; i < subSelections.size(); i++) {
        final BasicValuedMapping mapping = (BasicValuedMapping) subSelections.get(i).getExpressionType();
        final String columnName = "col" + i;
        final ColumnReference columnReference = new ColumnReference(identifierVariable, columnName, false, null, null, mapping.getJdbcMapping(), factory);
        final Expression expression = subSelections.get(i).getExpression();
        final Expression finalExpression;
        if (expression == windowFunction) {
            finalExpression = new SelfRenderingAggregateFunctionSqlAstExpression("min", (sqlAppender, sqlAstArguments, walker1) -> {
                sqlAppender.appendSql("min(");
                sqlAstArguments.get(0).accept(walker1);
                sqlAppender.append(')');
            }, Collections.singletonList(columnReference), null, (ReturnableType<?>) mapping.getMappedType(), expression.getExpressionType());
        } else {
            finalExpression = columnReference;
            selectionMapping.put(expression, i);
        }
        columnNames.add(columnName);
        selectClause.addSqlSelection(new ResolvedSqlSelection(i + 1, i, finalExpression, (BasicType<Object>) mapping.getJdbcMapping()));
    }
    // Migrate the group by clause to the outer query
    // and push group by expressions into the partition by clause of the window function
    final List<Expression> groupByExpressions = new ArrayList<>(subQuerySpec.getGroupByClauseExpressions().size());
    for (Expression groupByClauseExpression : subQuerySpec.getGroupByClauseExpressions()) {
        final Expression realExpression;
        final Expression outerGroupByExpression;
        if (groupByClauseExpression instanceof SqlSelectionExpression) {
            final SqlSelection selection = ((SqlSelectionExpression) groupByClauseExpression).getSelection();
            outerGroupByExpression = new SqlSelectionExpression(selectClause.getSqlSelections().get(selection.getValuesArrayPosition()));
            realExpression = selection.getExpression();
        } else {
            if (groupByClauseExpression instanceof SqmPathInterpretation<?>) {
                realExpression = ((SqmPathInterpretation<?>) groupByClauseExpression).getSqlExpression();
            } else {
                realExpression = groupByClauseExpression;
            }
            final Integer position = selectionMapping.get(realExpression);
            if (position == null) {
                // Group by something that has no corresponding selection item,
                // so we need to introduce an intermediate selection item
                final int valuesPosition = selectClause.getSqlSelections().size();
                final String columnName = "col" + valuesPosition;
                final JdbcMapping jdbcMapping = realExpression.getExpressionType().getJdbcMappings().get(0);
                final ColumnReference columnReference = new ColumnReference(identifierVariable, columnName, false, null, null, jdbcMapping, factory);
                final int subValuesPosition = subSelectClause.getSqlSelections().size();
                final SqlSelection subSelection = new ResolvedSqlSelection(subValuesPosition + 1, subValuesPosition, realExpression, (BasicType<Object>) jdbcMapping);
                columnNames.add(columnName);
                subSelectClause.addSqlSelection(subSelection);
                outerGroupByExpression = columnReference;
                selectionMapping.put(realExpression, subValuesPosition);
            } else {
                outerGroupByExpression = new SqlSelectionExpression(selectClause.getSqlSelections().get(position));
            }
        }
        windowFunction.getPartitions().add(realExpression);
        groupByExpressions.add(outerGroupByExpression);
    }
    outerQuerySpec.setGroupByClauseExpressions(groupByExpressions);
    subQuerySpec.setGroupByClauseExpressions(null);
    // Migrate the having clause to the outer query
    if (subQuerySpec.getHavingClauseRestrictions() != null) {
        final Predicate predicate = new ExpressionReplacementWalker() {

            @Override
            protected <X extends SqlAstNode> X replaceExpression(X expression) {
                if (expression instanceof Literal || expression instanceof JdbcParameter) {
                    return expression;
                }
                final Expression outerExpression;
                if (expression instanceof SqlSelectionExpression) {
                    final SqlSelection selection = ((SqlSelectionExpression) expression).getSelection();
                    outerExpression = selectClause.getSqlSelections().get(selection.getValuesArrayPosition()).getExpression();
                } else {
                    final Expression realExpression;
                    if (expression instanceof SqmPathInterpretation<?>) {
                        realExpression = ((SqmPathInterpretation<?>) expression).getSqlExpression();
                    } else {
                        realExpression = (Expression) expression;
                    }
                    final Integer position = selectionMapping.get(realExpression);
                    if (position == null) {
                        // An expression that has no corresponding selection item,
                        // so we need to introduce an intermediate selection item
                        final int valuesPosition = selectClause.getSqlSelections().size();
                        final String columnName = "col" + valuesPosition;
                        final JdbcMapping jdbcMapping = realExpression.getExpressionType().getJdbcMappings().get(0);
                        final ColumnReference columnReference = new ColumnReference(identifierVariable, columnName, false, null, null, jdbcMapping, factory);
                        final int subValuesPosition = subSelectClause.getSqlSelections().size();
                        final SqlSelection subSelection = new ResolvedSqlSelection(subValuesPosition + 1, subValuesPosition, realExpression, (BasicType<Object>) jdbcMapping);
                        columnNames.add(columnName);
                        subSelectClause.addSqlSelection(subSelection);
                        outerExpression = columnReference;
                        selectionMapping.put(realExpression, subValuesPosition);
                    } else {
                        outerExpression = selectClause.getSqlSelections().get(position).getExpression();
                    }
                }
                return (X) outerExpression;
            }
        }.replaceExpressions(subQuerySpec.getHavingClauseRestrictions());
        outerQuerySpec.setHavingClauseRestrictions(predicate);
        subQuerySpec.setHavingClauseRestrictions(null);
    }
    // Migrate the order by clause to the outer query
    if (subQuerySpec.hasSortSpecifications()) {
        for (SortSpecification sortSpecification : subQuerySpec.getSortSpecifications()) {
            final Expression sortExpression = sortSpecification.getSortExpression();
            final Expression outerSortExpression;
            if (sortExpression instanceof SqlSelectionExpression) {
                final SqlSelection selection = ((SqlSelectionExpression) sortExpression).getSelection();
                outerSortExpression = new SqlSelectionExpression(selectClause.getSqlSelections().get(selection.getValuesArrayPosition()));
            } else {
                final Expression realExpression;
                if (sortExpression instanceof SqmPathInterpretation<?>) {
                    realExpression = ((SqmPathInterpretation<?>) sortExpression).getSqlExpression();
                } else {
                    realExpression = sortExpression;
                }
                final Integer position = selectionMapping.get(realExpression);
                if (position == null) {
                    // Group by something that has no corresponding selection item,
                    // so we need to introduce an intermediate selection item
                    final int valuesPosition = selectClause.getSqlSelections().size();
                    final String columnName = "col" + valuesPosition;
                    final JdbcMapping jdbcMapping = realExpression.getExpressionType().getJdbcMappings().get(0);
                    final ColumnReference columnReference = new ColumnReference(identifierVariable, columnName, false, null, null, jdbcMapping, factory);
                    final int subValuesPosition = subSelectClause.getSqlSelections().size();
                    final SqlSelection subSelection = new ResolvedSqlSelection(subValuesPosition + 1, subValuesPosition, realExpression, (BasicType<Object>) jdbcMapping);
                    columnNames.add(columnName);
                    subSelectClause.addSqlSelection(subSelection);
                    outerSortExpression = columnReference;
                    selectionMapping.put(realExpression, subValuesPosition);
                } else {
                    outerSortExpression = new SqlSelectionExpression(selectClause.getSqlSelections().get(position));
                }
            }
            outerQuerySpec.addSortSpecification(new SortSpecification(outerSortExpression, sortSpecification.getSortOrder(), sortSpecification.getNullPrecedence()));
        }
        subQuerySpec.getSortSpecifications().clear();
    }
    // We need to add selection items for the expressions we order by to the sub query spec.
    final int selectionOffset = columnNames.size();
    // Collect the sorting column references so we can apply the filter later
    final List<ColumnReference> sortingColumns = new ArrayList<>(withinGroup.size());
    for (int i = 0; i < withinGroup.size(); i++) {
        final int valueIndex = selectionOffset + i;
        final Expression sortExpression = withinGroup.get(i).getSortExpression();
        final BasicValuedMapping mapping = (BasicValuedMapping) sortExpression.getExpressionType();
        final String columnName = "col" + valueIndex;
        final int oldValueIndex = subSelectClause.getSqlSelections().size();
        columnNames.add(columnName);
        subSelectClause.addSqlSelection(new ResolvedSqlSelection(oldValueIndex + 1, oldValueIndex, sortExpression, (BasicType<Object>) mapping.getJdbcMapping()));
        sortingColumns.add(new ColumnReference(identifierVariable, columnName, false, null, null, mapping.getJdbcMapping(), factory));
    }
    if (arguments != null) {
        // So we add a filter to the outer query so we can extract the rank
        switch(arguments.size()) {
            case 0:
                break;
            case 1:
                outerQuerySpec.applyPredicate(new ComparisonPredicate(sortingColumns.get(0), ComparisonOperator.EQUAL, (Expression) arguments.get(0)));
                break;
            default:
                outerQuerySpec.applyPredicate(new ComparisonPredicate(new SqlTuple(sortingColumns, null), ComparisonOperator.EQUAL, new SqlTuple((List<? extends Expression>) (List<?>) arguments, null)));
        }
    }
    final QueryPartTableGroup queryPartTableGroup = new QueryPartTableGroup(navigablePath, null, subQuerySpec, identifierVariable, columnNames, false, true, factory);
    outerQuerySpec.getFromClause().addRoot(queryPartTableGroup);
    // Migrate the offset/fetch clause
    outerQuerySpec.setOffsetClauseExpression(subQuerySpec.getOffsetClauseExpression());
    outerQuerySpec.setFetchClauseExpression(subQuerySpec.getFetchClauseExpression(), subQuerySpec.getFetchClauseType());
    subQuerySpec.setOffsetClauseExpression(null);
    subQuerySpec.setFetchClauseExpression(null, null);
    return outerQuerySpec;
}
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Example 3 with CteContainer

use of org.hibernate.sql.ast.tree.cte.CteContainer in project hibernate-orm by hibernate.

the class BaseSqmToSqlAstConverter method visitQuerySpec.

@Override
public QuerySpec visitQuerySpec(SqmQuerySpec<?> sqmQuerySpec) {
    final boolean topLevel = getProcessingStateStack().isEmpty();
    final QuerySpec sqlQuerySpec = new QuerySpec(topLevel, sqmQuerySpec.getFromClause().getNumberOfRoots());
    final SqmSelectClause selectClause = sqmQuerySpec.getSelectClause();
    final Predicate originalAdditionalRestrictions = additionalRestrictions;
    additionalRestrictions = null;
    final boolean trackAliasedNodePositions;
    if (trackSelectionsForGroup) {
        trackAliasedNodePositions = true;
    } else if (sqmQuerySpec.getOrderByClause() != null && sqmQuerySpec.getOrderByClause().hasPositionalSortItem()) {
        trackAliasedNodePositions = true;
    } else if (sqmQuerySpec.hasPositionalGroupItem()) {
        trackAliasedNodePositions = true;
    } else {
        // Since JPA Criteria queries can use the same expression object in order or group by items,
        // we need to track the positions to be able to replace the expression in the items with alias references
        // Also see #resolveGroupOrOrderByExpression for more details
        trackAliasedNodePositions = statement.getQuerySource() == SqmQuerySource.CRITERIA && (sqmQuerySpec.getOrderByClause() != null || !sqmQuerySpec.getGroupByClauseExpressions().isEmpty());
    }
    final SqlAstProcessingState processingState;
    if (trackAliasedNodePositions) {
        processingState = new SqlAstQueryPartProcessingStateImpl(sqlQuerySpec, getCurrentProcessingState(), this, r -> new SqmAliasedNodePositionTracker(r, selectClause.getSelections()), currentClauseStack::getCurrent, deduplicateSelectionItems);
    } else {
        processingState = new SqlAstQueryPartProcessingStateImpl(sqlQuerySpec, getCurrentProcessingState(), this, currentClauseStack::getCurrent, deduplicateSelectionItems);
    }
    final SqmQueryPart<?> sqmQueryPart = currentSqmQueryPart;
    final boolean originalDeduplicateSelectionItems = deduplicateSelectionItems;
    currentSqmQueryPart = sqmQuerySpec;
    // In sub-queries, we can never deduplicate the selection items as that might change semantics
    deduplicateSelectionItems = false;
    pushProcessingState(processingState);
    queryTransformers.push(new ArrayList<>());
    try {
        // we want to visit the from-clause first
        visitFromClause(sqmQuerySpec.getFromClause());
        visitSelectClause(selectClause);
        final SqmWhereClause whereClause = sqmQuerySpec.getWhereClause();
        if (whereClause != null) {
            sqlQuerySpec.applyPredicate(visitWhereClause(whereClause.getPredicate()));
        }
        sqlQuerySpec.setGroupByClauseExpressions(visitGroupByClause(sqmQuerySpec.getGroupByClauseExpressions()));
        if (sqmQuerySpec.getHavingClausePredicate() != null) {
            sqlQuerySpec.setHavingClauseRestrictions(visitHavingClause(sqmQuerySpec.getHavingClausePredicate()));
        }
        visitOrderByOffsetAndFetch(sqmQuerySpec, sqlQuerySpec);
        if (topLevel && statement instanceof SqmSelectStatement<?>) {
            if (orderByFragments != null) {
                orderByFragments.forEach(entry -> entry.getKey().apply(sqlQuerySpec, entry.getValue(), this));
                orderByFragments = null;
            }
            applyCollectionFilterPredicates(sqlQuerySpec);
        }
        QuerySpec finalQuerySpec = sqlQuerySpec;
        for (QueryTransformer transformer : queryTransformers.getCurrent()) {
            finalQuerySpec = transformer.transform(cteContainer, finalQuerySpec, this);
        }
        return finalQuerySpec;
    } finally {
        if (additionalRestrictions != null) {
            sqlQuerySpec.applyPredicate(additionalRestrictions);
        }
        additionalRestrictions = originalAdditionalRestrictions;
        popProcessingStateStack();
        queryTransformers.pop();
        currentSqmQueryPart = sqmQueryPart;
        deduplicateSelectionItems = originalDeduplicateSelectionItems;
    }
}
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Example 4 with CteContainer

use of org.hibernate.sql.ast.tree.cte.CteContainer in project hibernate-orm by hibernate.

the class BaseSqmToSqlAstConverter method visitDeleteStatement.

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Delete statement
@Override
public DeleteStatement visitDeleteStatement(SqmDeleteStatement<?> statement) {
    final CteContainer cteContainer = this.visitCteContainer(statement);
    final String entityName = statement.getTarget().getEntityName();
    final EntityPersister entityDescriptor = creationContext.getSessionFactory().getRuntimeMetamodels().getMappingMetamodel().getEntityDescriptor(entityName);
    assert entityDescriptor != null;
    pushProcessingState(new SqlAstProcessingStateImpl(getCurrentProcessingState(), this, getCurrentClauseStack()::getCurrent));
    try {
        final NavigablePath rootPath = statement.getTarget().getNavigablePath();
        final TableGroup rootTableGroup = entityDescriptor.createRootTableGroup(true, rootPath, statement.getRoot().getAlias(), () -> predicate -> additionalRestrictions = SqlAstTreeHelper.combinePredicates(additionalRestrictions, predicate), this, getCreationContext());
        getFromClauseAccess().registerTableGroup(rootPath, rootTableGroup);
        if (!rootTableGroup.getTableReferenceJoins().isEmpty()) {
            throw new HibernateException("Not expecting multiple table references for an SQM DELETE");
        }
        FilterHelper.applyBaseRestrictions((filterPredicate) -> additionalRestrictions = filterPredicate, entityDescriptor, rootTableGroup, AbstractSqlAstTranslator.rendersTableReferenceAlias(Clause.DELETE), getLoadQueryInfluencers(), this);
        Predicate suppliedPredicate = null;
        final SqmWhereClause whereClause = statement.getWhereClause();
        if (whereClause != null) {
            suppliedPredicate = visitWhereClause(whereClause.getPredicate());
        }
        return new DeleteStatement(cteContainer, (NamedTableReference) rootTableGroup.getPrimaryTableReference(), SqlAstTreeHelper.combinePredicates(suppliedPredicate, additionalRestrictions), Collections.emptyList());
    } finally {
        popProcessingStateStack();
    }
}
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Example 5 with CteContainer

use of org.hibernate.sql.ast.tree.cte.CteContainer in project hibernate-orm by hibernate.

the class BaseSqmToSqlAstConverter method visitSelectStatement.

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Select statement
@Override
public SelectStatement visitSelectStatement(SqmSelectStatement<?> statement) {
    final CteContainer cteContainer = this.visitCteContainer(statement);
    final QueryPart queryPart = visitQueryPart(statement.getQueryPart());
    final List<DomainResult<?>> domainResults = queryPart.isRoot() ? this.domainResults : Collections.emptyList();
    return new SelectStatement(cteContainer, queryPart, domainResults);
}
Also used : SqmCteContainer(org.hibernate.query.sqm.tree.cte.SqmCteContainer) CteContainer(org.hibernate.sql.ast.tree.cte.CteContainer) SelectStatement(org.hibernate.sql.ast.tree.select.SelectStatement) SqmInsertSelectStatement(org.hibernate.query.sqm.tree.insert.SqmInsertSelectStatement) SqmSelectStatement(org.hibernate.query.sqm.tree.select.SqmSelectStatement) SqmQueryPart(org.hibernate.query.sqm.tree.select.SqmQueryPart) QueryPart(org.hibernate.sql.ast.tree.select.QueryPart) DomainResult(org.hibernate.sql.results.graph.DomainResult)

Aggregations

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