[query] do not allow the creation of a field which classes with a necessary builtin

[danking]

What happened?

StructExpression s are Dict-like and we rely on this behavior for methods like .items(). We should probably ban the use of names like items so that you can always iterate over a struct expressions field names and field value expressions.

ht = ht.group_by(
    'gene'
).aggregate(
    items=hl.agg.take(ht.key, max(list(n_dict.values())), ordering = ht.rand_id)
)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/tmp/ipykernel_9677/3768472856.py in <cell line: 1>()
----> 1 ht = ht.group_by('gene').aggregate(items=hl.agg.take(ht.key, max(list(n_dict.values())), ordering = ht.rand_id))

<decorator-gen-1202> in aggregate(self, **named_exprs)

/opt/conda/miniconda3/lib/python3.10/site-packages/hail/typecheck/check.py in wrapper(__original_func, *args, **kwargs)
    582     def wrapper(__original_func, *args, **kwargs):
    583         args_, kwargs_ = check_all(__original_func, args, kwargs, checkers, is_method=is_method)
--> 584         return __original_func(*args_, **kwargs_)
    585
    586     return wrapper

/opt/conda/miniconda3/lib/python3.10/site-packages/hail/table.py in aggregate(self, **named_exprs)
    243
    244         key_struct = self._key_expr
--> 245         return Table(ir.TableKeyByAndAggregate(base._tir,
    246                                                hl.struct(**named_exprs)._ir,
    247                                                key_struct._ir,

/opt/conda/miniconda3/lib/python3.10/site-packages/hail/table.py in __init__(self, tir)
    365
    366         for k, v in itertools.chain(self._globals.items(),
--> 367                                     self._row.items()):
    368             self._set_field(k, v)
    369

TypeError: 'ArrayStructExpression' object is not callable

Version

0.2.120

Relevant log output

No response