LaiZhou commented on a change in pull request #1156: [CALCITE-2973] Allow theta
joins that have equi conditions to be exec…
URL: https://github.com/apache/calcite/pull/1156#discussion_r283388282
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File path:
linq4j/src/main/java/org/apache/calcite/linq4j/EnumerableDefaults.java
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@@ -1063,22 +1084,25 @@ public void close() {
final Enumerable<TSource> outer, final Enumerable<TInner> inner,
final Function1<TSource, TKey> outerKeySelector,
final Function1<TInner, TKey> innerKeySelector,
+ final Predicate2<TSource, TInner> predicate,
final Function2<TSource, TInner, TResult> resultSelector,
final EqualityComparer<TKey> comparer, final boolean generateNullsOnLeft,
final boolean generateNullsOnRight) {
return new AbstractEnumerable<TResult>() {
public Enumerator<TResult> enumerator() {
+ final List<TInner> rightList = inner.toList();
final Lookup<TKey, TInner> innerLookup =
comparer == null
- ? inner.toLookup(innerKeySelector)
- : inner.toLookup(innerKeySelector, comparer);
+ ? Linq4j.asEnumerable(rightList).toLookup(innerKeySelector)
Review comment:
@rubenada , we want to get the rightUnmatched, so the inner would be figured
out at first.
` final List<TInner> rightList = inner.toList();
`
Converting the rightList back to enumerable would't increase the overhead,
because `Linq4j.asEnumerable(rightList)` that will produce a ListEnumerable.
If we keep the original inner, when doing `toLookup`, this inner will be
figured out again , it's unnecessary.
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