CCF_100/relational
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Finish fixing the optimization

Browse Source 
I wrote it ages ago, I was not as skilled as I am now.
This commit is contained in:
Salvo 'LtWorf' Tomaselli 2020-06-09 23:47:04 +02:00
parent f4a4b847af
commit d7145171de
No known key found for this signature in database
GPG Key ID: B3A7CF0C801886CF
1 changed files with 8 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
relational/optimizations.py
View File

@ -506,17 +506,15 @@ def selection_and_product(n: parser.Node, rels: Dict[str, Relation]) -> parser.N
if j in r_attr: # Field in right
r_fields = True
if l_fields and r_fields: # Fields in both
both.append(i)
elif l_fields:
if l_fields and not r_fields:
left.append(i)
elif r_fields:
elif r_fields and not l_fields:
right.append(i)
else: # Unknown.. adding in both
both.append(i)
# Preparing left selection
if len(left) > 0:
if left:
l_prop = ''
while len(left) > 0:
c = left.pop(0)
@ -531,8 +529,7 @@ def selection_and_product(n: parser.Node, rels: Dict[str, Relation]) -> parser.N
l_node = n.child.left
# Preparing right selection
if len(right) > 0:
if right:
r_prop = ''
while len(right) > 0:
c = right.pop(0)
@ -548,8 +545,8 @@ def selection_and_product(n: parser.Node, rels: Dict[str, Relation]) -> parser.N
b_node = parser.Binary(n.child.name, l_node, r_node)
# Changing main selection
both_prop = ''
if len(both) != 0:
if both:
both_prop = ''
while len(both) > 0:
c = both.pop(0)
both_prop += ' '.join(c)
@ -557,7 +554,8 @@ def selection_and_product(n: parser.Node, rels: Dict[str, Relation]) -> parser.N
both_prop += ' and '
if '(' in both_prop:
both_prop = '(%s)' % both_prop
return parser.Unary(SELECTION, both_prop, b_node), 1
r = parser.Unary(SELECTION, both_prop, b_node)
return r, len(left) + len(right)
else: # No need for general select
return b_node, 1