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Remove useless joins in optimization

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Along with removing intersections and unions, this
removes useless joins in the same function.
This commit is contained in:
Salvo 'LtWorf' Tomaselli 2016-04-15 14:56:09 +02:00
parent a5aef4a0fe
commit 3779a1de81
1 changed files with 1 additions and 1 deletions
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relational/optimizations.py
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@ -133,7 +133,7 @@ def futile_union_intersection_subtraction(n):
changes = 0
# Union and intersection of the same thing
if n.name in (UNION, INTERSECTION) and n.left == n.right:
if n.name in (UNION, INTERSECTION, JOIN, JOIN_LEFT, JOIN_RIGHT, JOIN_FULL) and n.left == n.right:
changes = 1
replace_node(n, n.left)