Examples with AbstractSqmPathInterpretation org.hibernate.query.sqm.sql.internal.AbstractSqmPathInterpretation used on opensource projects

Example 1 with AbstractSqmPathInterpretation

use of org.hibernate.query.sqm.sql.internal.AbstractSqmPathInterpretation in project hibernate-orm by hibernate.

the class CountFunction method canReplaceWithStar.

private boolean canReplaceWithStar(SqlAstNode arg, SqlAstTranslator<?> translator) {
    // To determine if we can replace the argument with a star, we must know if the argument is nullable
    if (arg instanceof AbstractSqmPathInterpretation<?>) {
        final AbstractSqmPathInterpretation<?> pathInterpretation = (AbstractSqmPathInterpretation<?>) arg;
        final TableGroup tableGroup = pathInterpretation.getTableGroup();
        final Expression sqlExpression = pathInterpretation.getSqlExpression();
        final JdbcMappingContainer expressionType = sqlExpression.getExpressionType();
        // The entity identifier mapping is always considered non-nullable
        final boolean isNonNullable = expressionType instanceof EntityIdentifierMapping;
        // But we also have to check if it contains joins that could alter the nullability (RIGHT or FULL)
        if (isNonNullable && tableGroup.canUseInnerJoins() && !hasJoinsAlteringNullability(tableGroup)) {
            // COUNT can only be used in query specs as query groups can only refer positionally in the order by
            final QuerySpec querySpec = (QuerySpec) translator.getCurrentQueryPart();
            // On top of this, we also have to ensure that there are no neighbouring joins that alter nullability
            for (TableGroup root : querySpec.getFromClause().getRoots()) {
                final Boolean result = hasNeighbouringJoinsAlteringNullability(root, tableGroup);
                if (result != null) {
                    return !result;
                }
            }
            return true;
        }
    }
    return false;
}