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relational
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Salvo 'LtWorf' Tomaselli 2020-06-27 15:47:55 +07:00
parent 79610ab8f5
commit 9f171fa393
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1 changed files with 25 additions and 22 deletions
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relational/parser.py
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@ -147,29 +147,32 @@ class Node:
if isinstance(self, Variable): #FIXME this is ugly if isinstance(self, Variable): #FIXME this is ugly
return list(rels[self.name].header) return list(rels[self.name].header)
elif isinstance(self, Binary) and self.name in (DIFFERENCE, UNION, INTERSECTION): elif isinstance(self, Binary):
return self.left.result_format(rels) if self.name in (DIFFERENCE, UNION, INTERSECTION):
elif isinstance(self, Binary) and self.name == DIVISION: return self.left.result_format(rels)
return list(set(self.left.result_format(rels)) - set(self.right.result_format(rels))) elif self.name == DIVISION:
elif self.name == PROJECTION: return list(set(self.left.result_format(rels)) - set(self.right.result_format(rels)))
return self.get_projection_prop() elif self.name == PRODUCT:
elif self.name == PRODUCT: return self.left.result_format(rels) + self.right.result_format(rels)
return self.left.result_format(rels) + self.right.result_format(rels) elif self.name in (JOIN, JOIN_LEFT, JOIN_RIGHT, JOIN_FULL):
elif self.name == SELECTION: return list(set(self.left.result_format(rels)).union(set(self.right.result_format(rels))))
return self.child.result_format(rels) elif isinstance(self, Unary):
elif self.name == RENAME: if self.name == PROJECTION:
_vars = {} return self.get_projection_prop()
for i in self.prop.split(','): elif self.name == SELECTION:
q = i.split(ARROW) return self.child.result_format(rels)
_vars[q[0].strip()] = q[1].strip() elif self.name == RENAME:
_vars = {}
for i in self.prop.split(','):
q = i.split(ARROW)
_vars[q[0].strip()] = q[1].strip()
_fields = self.child.result_format(rels)
for i in range(len(_fields)):
if _fields[i] in _vars:
_fields[i] = _vars[_fields[i]]
return _fields
_fields = self.child.result_format(rels)
for i in range(len(_fields)):
if _fields[i] in _vars:
_fields[i] = _vars[_fields[i]]
return _fields
elif self.name in (JOIN, JOIN_LEFT, JOIN_RIGHT, JOIN_FULL):
return list(set(self.left.result_format(rels)).union(set(self.right.result_format(rels))))
raise ValueError('What kind of alien object is this?') raise ValueError('What kind of alien object is this?')
def __eq__(self, other): #FIXME def __eq__(self, other): #FIXME