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relational
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Not a constant

master
Salvo 'LtWorf' Tomaselli 2020-06-14 22:34:27 +07:00
parent aa6568bac2
commit 4ab01c9e47
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GPG Key ID: B3A7CF0C801886CF
1 changed files with 5 additions and 5 deletions
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10
relational/optimizations.py
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@ -72,7 +72,7 @@ def duplicated_select(n: parser.Node) -> Tuple[parser.Node, int]:
in and
'''
changes = 0
while isinstance(n, parser.UNARY) and n.name == SELECTION and isinstance(n.child, parser.UNARY) and n.child.name == SELECTION:
while isinstance(n, parser.Unary) and n.name == SELECTION and isinstance(n.child, parser.Unary) and n.child.name == SELECTION:
changes += 1
prop = n.prop
@ -147,7 +147,7 @@ def down_to_unions_subtractions_intersections(n: parser.Node) -> Tuple[parser.No
'''
changes = 0
_o = (UNION, DIFFERENCE, INTERSECTION)
if isinstance(n, parser.UNARY) and n.name == SELECTION and n.child.name in _o:
if isinstance(n, parser.Unary) and n.name == SELECTION and n.child.name in _o:
l = parser.Unary(SELECTION, n.prop, n.child.left)
r = parser.Unary(SELECTION, n.prop, n.child.right)
@ -170,7 +170,7 @@ def duplicated_projection(n: parser.Node) -> Tuple[parser.Node, int]:
def selection_inside_projection(n: parser.Node) -> Tuple[parser.Node, int]:
'''This function locates things like σ j (π k(R)) and
converts them into π k(σ j (R))'''
if isinstance(n, parser.UNARY) and n.name == SELECTION and n.child.name == PROJECTION:
if isinstance(n, parser.Unary) and n.name == SELECTION and n.child.name == PROJECTION:
child = parser.Unary(
SELECTION,
n.prop,
@ -338,7 +338,7 @@ def swap_rename_select(n: parser.Node) -> int:
Renaming the attributes used in the
selection, so the operation is still valid.'''
if isinstance(n, parser.UNARY) and n.name == SELECTION and n.child.name == RENAME:
if isinstance(n, parser.Unary) and n.name == SELECTION and n.child.name == RENAME:
# This is an inverse mapping for the rename
renames = {v: k for k, v in n.child.get_rename_prop().items()}
@ -438,7 +438,7 @@ def selection_and_product(n: parser.Node, rels: Dict[str, Relation]) -> parser.N
σ l (σ j (R) * σ i (Q)). Where j contains only attributes belonging to R,
i contains attributes belonging to Q and l contains attributes belonging to both'''
if isinstance(n, parser.UNARY) and n.name == SELECTION and n.child.name in (PRODUCT, JOIN):
if isinstance(n, parser.Unary) and n.name == SELECTION and n.child.name in (PRODUCT, JOIN):
l_attr = n.child.left.result_format(rels)
r_attr = n.child.right.result_format(rels)