From 75bcc43e7efbcc269e6678b25ceff930158bdac8 Mon Sep 17 00:00:00 2001
From: Jerrod Carpenter <4128301+JerrodCarpenter@users.noreply.github.com>
Date: Fri, 9 Jun 2023 21:35:35 -0500
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20Add=20SINTERCARD?=
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---
 lib/redis/commands/sets.rb | 13 +++++++++++++
 lib/redis/distributed.rb   |  9 +++++++++
 test/lint/sets.rb          | 10 ++++++++++
 3 files changed, 32 insertions(+)

diff --git a/lib/redis/commands/sets.rb b/lib/redis/commands/sets.rb
index e05751397..fcd538e57 100644
--- a/lib/redis/commands/sets.rb
+++ b/lib/redis/commands/sets.rb
@@ -154,6 +154,19 @@ def sinterstore(destination, *keys)
         send_command([:sinterstore, destination].concat(keys))
       end
 
+      # This command is similar to SINTER, but instead of returning the result set,
+      #   it returns just the cardinality of the result.
+      #
+      # @param [String, Array<String>] keys keys pointing to sets to intersect
+      # @param [Interger] limits number of matches searched for
+      # @return [Array<String>] cardinality of the intersection
+      def sintercard(*keys, limit: nil)
+        args = [:sintercard, keys.size, keys]
+        args << "LIMIT" << limit if limit
+
+        send_command(args)
+      end
+
       # Add multiple sets.
       #
       # @param [String, Array<String>] keys keys pointing to sets to unify
diff --git a/lib/redis/distributed.rb b/lib/redis/distributed.rb
index e92d417fa..d469a60e5 100644
--- a/lib/redis/distributed.rb
+++ b/lib/redis/distributed.rb
@@ -648,6 +648,15 @@ def sinterstore(destination, *keys)
       end
     end
 
+    # This command is similar to SINTER, but instead of returning the result set,
+    #   it returns just the cardinality of the result.
+    def sintercard(*keys, limit: nil)
+      keys.flatten!(1)
+      ensure_same_node(:sintercard, keys) do |node|
+        node.sintercard(*keys, limit: limit)
+      end
+    end
+
     # Add multiple sets.
     def sunion(*keys)
       keys.flatten!(1)
diff --git a/test/lint/sets.rb b/test/lint/sets.rb
index bfaa5cf84..0c0d7711c 100644
--- a/test/lint/sets.rb
+++ b/test/lint/sets.rb
@@ -237,6 +237,16 @@ def test_variadic_sinterstore_expand
       assert_equal 1, r.sinterstore('{1}baz', '{1}foo', '{1}bar')
     end
 
+    def test_sintercard
+      target_version("7.0") do
+        r.sadd '{1}foo', 's1'
+        r.sadd '{1}foo', 's2'
+        r.sadd '{1}bar', 's2'
+
+        assert_equal 1, r.sintercard('{1}foo', '{1}bar')
+      end
+    end
+
     def test_sunion
       r.sadd 'foo', 's1'
       r.sadd 'foo', 's2'