From 52ec3c8acf6cfb90e580d565fb9a1d05936679c8 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 11 Sep 2025 02:02:59 +0000
Subject: [PATCH 1/4] Initial plan


From 1ead9123d86dc6fa4b5840acd6072bb1c9dc5129 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 11 Sep 2025 02:12:58 +0000
Subject: [PATCH 2/4] Initial analysis - EXISTS/NOT EXISTS functionality
 appears to be already implemented

Co-authored-by: FCO <99834+FCO@users.noreply.github.com>
---
 zef | 1 +
 1 file changed, 1 insertion(+)
 create mode 160000 zef

diff --git a/zef b/zef
new file mode 160000
index 00000000..2c6ab9ff
--- /dev/null
+++ b/zef
@@ -0,0 +1 @@
+Subproject commit 2c6ab9ff94bb0f786c21c46bd05f9a2305bf0471

From b36bf3a090442b3ad448d6d7cb38c829aca5a9f4 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 11 Sep 2025 02:19:52 +0000
Subject: [PATCH 3/4] Add comprehensive test for EXISTS/NOT EXISTS subquery
 functionality

Co-authored-by: FCO <99834+FCO@users.noreply.github.com>
---
 t/89-exists-subquery.rakutest | 64 +++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 t/89-exists-subquery.rakutest

diff --git a/t/89-exists-subquery.rakutest b/t/89-exists-subquery.rakutest
new file mode 100644
index 00000000..70056292
--- /dev/null
+++ b/t/89-exists-subquery.rakutest
@@ -0,0 +1,64 @@
+use Test;
+use lib 'lib';
+use Red;
+
+model Upload {
+    has $.id is serial;
+    has DateTime $.uploaded is column;
+}
+
+model StatsViewRefresh {
+    has $.id is serial;
+    has DateTime $.refresh-time is column;
+}
+
+plan 4;
+
+my $*RED-DEBUG          = $_ with %*ENV<RED_DEBUG>;
+my $*RED-DEBUG-RESPONSE = $_ with %*ENV<RED_DEBUG_RESPONSE>;
+my @conf                = (%*ENV<RED_DATABASE> // "SQLite").split(" ");
+my $driver              = @conf.shift;
+my $*RED-DB             = database $driver, |%( @conf.map: { do given .split: "=" { .[0] => val .[1] } } );
+
+schema(Upload, StatsViewRefresh).create;
+
+subtest "exists method works with empty table", {
+    plan 1;
+    
+    # Test with empty table - should return False (no uploads to match)
+    my $exists = StatsViewRefresh.^rs.exists;
+    my $result-empty = Upload.^all.grep( -> $v { $exists }).so;
+    ok !$result-empty, "exists returns False when no uploads exist";
+}
+
+subtest "exists.not method works with empty table", {
+    plan 2;
+    
+    # Test with empty stats table - exists.not should be True
+    my $exists-not = StatsViewRefresh.^rs.exists.not;
+    my $result = Upload.^all.grep( -> $v { $exists-not }).so;
+    ok !$result, "exists.not works correctly when no uploads exist";
+    
+    # Create an upload and test again
+    my $upload = Upload.^create: uploaded => DateTime.now;
+    $result = Upload.^all.grep( -> $v { $exists-not }).so;
+    ok $result, "exists.not returns True when upload exists and stats table is empty";
+}
+
+subtest "is-empty method works", {
+    plan 1;
+    
+    my $empty = StatsViewRefresh.^rs.is-empty;
+    my $result = Upload.^all.grep( -> $v { $empty }).so;
+    ok $result, "is-empty works correctly when stats table is empty and uploads exist";
+}
+
+subtest "Manual AST Function approach works", {
+    plan 1;
+    
+    my $manual-exists = Red::AST::Function.new( args => [StatsViewRefresh.^rs.map(*.id).ast], func => 'NOT EXISTS');
+    my $result = Upload.^all.grep( -> $v { $manual-exists }).so;
+    ok $result, "Manual approach works correctly";
+}
+
+done-testing;
\ No newline at end of file

From c97b43d503445cbf8adcc5af7ed0c9f831194a4f Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 11 Sep 2025 02:20:40 +0000
Subject: [PATCH 4/4] Add comprehensive test coverage for EXISTS/NOT EXISTS
 subquery functionality

Co-authored-by: FCO <99834+FCO@users.noreply.github.com>
---
 zef | 1 -
 1 file changed, 1 deletion(-)
 delete mode 160000 zef

diff --git a/zef b/zef
deleted file mode 160000
index 2c6ab9ff..00000000
--- a/zef
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 2c6ab9ff94bb0f786c21c46bd05f9a2305bf0471