From 19e7d644bd4091921ebd3ab2facfbd27098659f4 Mon Sep 17 00:00:00 2001
From: Håvard Pettersen <havardpe@yahooinc.com>
Date: Mon, 26 Sep 2022 08:37:42 +0000
Subject: expose all-documents predicate for iterators

---
 searchlib/src/vespa/searchlib/queryeval/emptysearch.h    | 1 +
 searchlib/src/vespa/searchlib/queryeval/full_search.h    | 1 +
 searchlib/src/vespa/searchlib/queryeval/searchiterator.h | 6 ++++++
 3 files changed, 8 insertions(+)

(limited to 'searchlib/src')

diff --git a/searchlib/src/vespa/searchlib/queryeval/emptysearch.h b/searchlib/src/vespa/searchlib/queryeval/emptysearch.h
index 897decb456b..c12ce33d6ab 100644
--- a/searchlib/src/vespa/searchlib/queryeval/emptysearch.h
+++ b/searchlib/src/vespa/searchlib/queryeval/emptysearch.h
@@ -21,6 +21,7 @@ protected:
         setAtEnd();
     }
     virtual Trinary is_strict() const override;
+    Trinary matches_any() const override { return Trinary::False; }
 
 public:
     EmptySearch();
diff --git a/searchlib/src/vespa/searchlib/queryeval/full_search.h b/searchlib/src/vespa/searchlib/queryeval/full_search.h
index 81c9125807e..df73f24b174 100644
--- a/searchlib/src/vespa/searchlib/queryeval/full_search.h
+++ b/searchlib/src/vespa/searchlib/queryeval/full_search.h
@@ -21,6 +21,7 @@ private:
     void or_hits_into(BitVector &result, uint32_t begin_id) override;
     void and_hits_into(BitVector &result, uint32_t begin_id) override;
     BitVector::UP get_hits(uint32_t begin_id) override;
+    Trinary matches_any() const override { return Trinary::True; }
 
 public:
     FullSearch();
diff --git a/searchlib/src/vespa/searchlib/queryeval/searchiterator.h b/searchlib/src/vespa/searchlib/queryeval/searchiterator.h
index 3a57d15b1e9..38a11b4d960 100644
--- a/searchlib/src/vespa/searchlib/queryeval/searchiterator.h
+++ b/searchlib/src/vespa/searchlib/queryeval/searchiterator.h
@@ -355,6 +355,12 @@ public:
 
     virtual Trinary is_strict() const { return Trinary::Undefined; }
 
+    // will this iterator match any document?
+    // (True -> all documents match)
+    // (False -> no documents match)
+    // (Undefined -> use seek to find out)
+    // number of matches: (False <= Undefined <= True)
+    virtual Trinary matches_any() const { return Trinary::Undefined; }
 };
 
 }
-- 
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