def create_pipe_call(source, *args, **kwargs):
first, *rest = args
return Pipeable(
Call("__call__", strip_symbolic(source), strip_symbolic(first),
*(Lazy(strip_symbolic(x)) for x in rest),
**{k: Lazy(strip_symbolic(v))
for k, v in kwargs.items()}))
def _case_when(__data, cases):
if not isinstance(cases, dict):
raise Exception("Cases must be a dictionary")
dict_entries = dict(
(strip_symbolic(k), strip_symbolic(v)) for k, v in cases.items())
cases_arg = Lazy(DictCall("__call__", dict, dict_entries))
return create_sym_call(case_when, __data, cases_arg)
def shape_call(
self,
call, window = True, str_accessors = False,
verb_name = None, arg_name = None,
):
# TODO: error if mutate receives a literal value?
# TODO: dispatch_cls currently unused
if str_accessors and isinstance(call, str):
# verbs that can use strings as accessors, like group_by, or
# arrange, need to convert those strings into a getitem call
return str_to_get_item_call(call)
elif isinstance(call, sql.elements.ColumnClause):
return Lazy(call)
elif not isinstance(call, Call):
# verbs that use literal strings, need to convert them to a call
# that returns a sqlalchemy "literal" object
return Lazy(sql.literal(call))
# set up locals funcs dict
f_dict1 = self.funcs['scalar']
f_dict2 = self.funcs['window' if window else 'aggregate']
funcs = {**f_dict1, **f_dict2}
# determine dispatch class
cls_name = 'window' if window else 'aggregate'
dispatch_cls = self.dispatch_cls[cls_name]
call_shaper = CallTreeLocal(
funcs,
call_sub_attr = self.call_sub_attr,
dispatch_cls = dispatch_cls,
result_cls = self.result_cls
)
# raise informative error message if missing translation
try:
return call_shaper.enter(call)
except FunctionLookupError as err:
raise SqlFunctionLookupError.from_verb(
verb_name or "Unknown",
arg_name or "Unknown",
err,
short = True
)
def shape_call(self, call, window=True, str_accessors=False):
# TODO: error if mutate receives a literal value?
if str_accessors and isinstance(call, str):
# verbs that can use strings as accessors, like group_by, or
# arrange, need to convert those strings into a getitem call
return str_to_get_item_call(call)
elif not isinstance(call, Call):
# verbs that use literal strings, need to convert them to a call
# that returns a sqlalchemy "literal" object
return Lazy(sql.literal(call))
f_dict1 = self.funcs['scalar']
f_dict2 = self.funcs['window' if window else 'aggregate']
funcs = {**f_dict1, **f_dict2}
call_shaper = CallTreeLocal(funcs,
rm_attr=self.rm_attr,
call_sub_attr=self.call_sub_attr)
return call_shaper.enter(call)
