SqlAlchemy的group_by问题

Question

我在使用SqlAlchemy和group_by子句时遇到问题。请参见下面的SqlAlchemy查询。

我有一个SqlAlchemy查询，其中包含一个group_by子句，并引发一个异常“（cx_Oracle.DatabaseError）ORA-00979：不是GROUP BY表达式”。但是，当我获得由SqlAlachemy查询生成的SQL并手动运行该查询时，该查询工作正常。

我不确定如何确定group_by子句出了什么问题。是否有人对我如何继续调试此问题以及找出解决该问题的方法有任何建议，想法和建议？

预先感谢， 道格

# create shorthand aliases
b = db.aliased(Batch)
bs = db.aliased(BatchingStatus)
bp = db.aliased(BatchPress)
bst = db.aliased(BatchState)
bit = db.aliased(BatchItem)
bin = db.aliased(BatchInput)
bpri = db.aliased(BatchPriority)
lcu = db.aliased(LCUser)
s = db.aliased(SubBatch)
w = db.aliased(WorkType)
ptw = db.aliased(LCProductToWorkType)
ctp = db.aliased(LCCategoryToProduct)
c = db.aliased(LCCategory)

# for correlated subquery
subq = (
    db.session.query(ctp.product_name)
        .join(c, c.category_id == ctp.category_id)
        .filter(func.lower(c.category_path) == category)
        .filter(ctp.active == 1)
)
# start of problem query
q = db.session.query(
    b.batch_signature.label('batch_signature'),
    b.batch_num,
    b.created_date.label('created_date'),
    bst.code.label('batch_state'),
    func.min(bin.promise_date).label('due_out'),
    bs.job_status,
    bp.press_id.label('press_id'),
    bp.description.label('press_description'),
    bp.code.label('press_code'),
    bp.active.label('press_active'),
    func.listagg(bin.item_id, ',').within_group(bin.item_id).label('subbatches'),
    bs.item_count.label('item_count'),
    bs.product.label('product'),
    bpri.code.label('priority'),
    ptw.display_format.label('product_display_format'),
    c.display_name.label('category_display_name'),
    lcu.coalesce_first_name,
    lcu.coalesce_last_name,
    lcu.coalesce_email,
) \
    .join(bs, (bs.batch_signature == b.batch_signature) & (bs.press_id == b.press_id)) \
    .join(bp, bp.press_id == b.press_id) \
    .join(bst, bst.state_id == b.state_id) \
    .join(bit, bit.batch_id == b.batch_id) \
    .join(bin, bin.batch_input_id == bit.batch_input_id) \
    .join(bpri, bpri.priority_id == bin.priority_id) \
    .join(lcu, lcu.username == bs.actor) \
    .join(s, s.subbatchno == func.to_char(bin.item_id)) \
    .join(w, w.worktypeenum == s.worktypeenum) \
    .join(ptw, ptw.worktypeenum == w.worktypeenum) \
    .join(ctp, ctp.category_to_product_id == ptw.category_to_product_id) \
    .join(c, c.category_id == ctp.category_id) \
    .filter(bs.product.in_(subq)) \
    .filter(b.state_id <= 200) \
    .group_by(
        b.batch_signature,
        b.batch_num,
        b.created_date,
        bst.code,
        bs.job_status,
        bp.press_id,
        bp.description,
        bp.code,
        bp.active,
        bs.item_count,
        bs.product,
        bpri.code,
        ptw.display_format,
        c.display_name,
        lcu.coalesce_first_name,
        lcu.coalesce_last_name,
        lcu.coalesce_email,
    ) \
    .order_by('batch_signature', 'batch_num', 'created_date')
try:
    retval = q.all()
except Exception as e:
    print e

上面没有显示模型，其中一些模型具有@hybrid_property / @。expression方法，例如lcu.coalesce_first_name列，它们试图隐藏我认为是导致group_by的@ func.coalesce代码。问题。