如何在QueryDSL BooleanExpression中使用SubQeryExpression

import com.querydsl.core.types.dsl.BooleanExpression;
import com.querydsl.core.types.dsl.Expressions;
import com.querydsl.jpa.impl.JPAQueryFactory;

// 创建查询工厂对象
JPAQueryFactory queryFactory = new JPAQueryFactory(entityManager);

// 构建子查询
QEntity subEntity = QEntity.entity;
BooleanExpression subQuery = subEntity.field.eq(value);

// 在主查询中使用子查询
QEntity mainEntity = QEntity.entity;
BooleanExpression mainQuery = mainEntity.field.in(
    JPAExpressions.select(subEntity.field)
                 .from(subEntity)
                 .where(subQuery)
);

// 执行查询
List<Entity> result = queryFactory.selectFrom(mainEntity)
                                  .where(mainQuery)
                                  .fetch();