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Tweaks the join reordering algorithm to prefer using bound variables

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pull/21/head
Tpt 5 years ago
parent cf805ea3d1
commit 58fe455621
2 changed files with 161 additions and 155 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 300
      bench/bsbm.explore.svg
  2. 16
      lib/src/sparql/plan_builder.rs

300
bench/bsbm.explore.svg
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16
lib/src/sparql/plan_builder.rs
Unescape View File

@ -934,25 +934,31 @@ fn count_pattern_binds(
pattern: &TripleOrPathPattern, pattern: &TripleOrPathPattern,
assigned_variables: &HashSet<&Variable>, assigned_variables: &HashSet<&Variable>,
) -> u8 { ) -> u8 {
let mut count = 3; let mut count = 12;
if let TermOrVariable::Variable(v) = pattern.subject() { if let TermOrVariable::Variable(v) = pattern.subject() {
if !assigned_variables.contains(v) { if !assigned_variables.contains(v) {
count -= 1; count -= 4;
} }
} else {
count -= 1;
} }
if let TripleOrPathPattern::Triple(t) = pattern { if let TripleOrPathPattern::Triple(t) = pattern {
if let NamedNodeOrVariable::Variable(v) = &t.predicate { if let NamedNodeOrVariable::Variable(v) = &t.predicate {
if !assigned_variables.contains(v) { if !assigned_variables.contains(v) {
count -= 1; count -= 4;
} }
} else {
count -= 1;
} }
} else { } else {
count -= 1; count -= 3;
} }
if let TermOrVariable::Variable(v) = pattern.object() { if let TermOrVariable::Variable(v) = pattern.object() {
if !assigned_variables.contains(v) { if !assigned_variables.contains(v) {
count -= 1; count -= 4;
} }
} else {
count -= 1;
} }
count count
} }

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