def _sel_relation_steps(self, plan, rqlst, relation):
"""handle the selection of relations for a delete query"""
select = Select()
lhs, rhs = relation.get_variable_parts()
select.append_selected(lhs.copy(select))
select.append_selected(rhs.copy(select))
select.set_where(relation.copy(select))
if rqlst.where is not None:
select.add_restriction(rqlst.where.copy(select))
if getattr(rqlst, 'having', None):
select.set_having([x.copy(select) for x in rqlst.having])
return self._select_plan(plan, select, rqlst.solutions)
def _sel_variable_step(self, plan, rqlst, etype, varref):
"""handle the selection of variables for a delete query"""
select = Select()
varref = varref.copy(select)
select.defined_vars = {varref.name: varref.variable}
select.append_selected(varref)
if rqlst.where is not None:
select.set_where(rqlst.where.copy(select))
if getattr(rqlst, 'having', None):
select.set_having([x.copy(select) for x in rqlst.having])
if etype != 'Any':
select.add_type_restriction(varref.variable, etype)
return self._select_plan(plan, select, rqlst.solutions)