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Enable duplicated_projection

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Salvo 'LtWorf' Tomaselli 2020-06-09 11:45:35 +02:00
parent 50647294cb
commit 403b7b9962
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GPG Key ID: B3A7CF0C801886CF
1 changed files with 7 additions and 7 deletions
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14
relational/optimizations.py
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@ -206,16 +206,16 @@ def down_to_unions_subtractions_intersections(n: parser.Node) -> int:
return changes + recoursive_scan(down_to_unions_subtractions_intersections, n)
def duplicated_projection(n: parser.Node) -> int:
def duplicated_projection(n: parser.Node) -> Tuple[parser.Node, int]:
'''This function locates thing like π i ( π j (R)) and replaces
them with π i (R)'''
changes = 0
if n.name == PROJECTION and n.child.name == PROJECTION:
n.child = n.child.child
changes += 1
return changes + recoursive_scan(duplicated_projection, n)
return parser.Unary(
PROJECTION,
n.prop,
n.child.child), 1
return n, 0
def selection_inside_projection(n: parser.Node) -> int:
@ -678,7 +678,7 @@ def useless_projection(n, rels) -> int:
general_optimizations = [
duplicated_select,
#down_to_unions_subtractions_intersections,
#duplicated_projection,
duplicated_projection,
#selection_inside_projection,
#subsequent_renames,
#swap_rename_select,