diff --git a/Gemfile.lock b/Gemfile.lock
index 30696cd..0128d06 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    data_drain (0.5.0)
+    data_drain (0.5.1)
       activemodel (>= 6.0)
       aws-sdk-glue (~> 1.0)
       aws-sdk-s3 (~> 1.114)
diff --git a/lib/data_drain/record.rb b/lib/data_drain/record.rb
index 0f65ad7..b36ace5 100644
--- a/lib/data_drain/record.rb
+++ b/lib/data_drain/record.rb
@@ -131,7 +131,10 @@ class << self
       # @param partitions [Hash]
       # @return [String]
       def build_query_path(partitions)
-        partition_path = partition_keys.map { |k| "#{k}=#{partitions[k.to_sym] || partitions[k.to_s]}" }.join("/")
+        partition_path = partition_keys.map do |k|
+          val = partitions.key?(k.to_sym) ? partitions[k.to_sym] : partitions[k.to_s]
+          val.nil? || val.to_s.empty? ? "#{k}=*" : "#{k}=#{val}"
+        end.join("/")
         DataDrain::Storage.adapter.build_path(bucket, folder_name, partition_path)
       end
 
diff --git a/spec/data_drain/record_spec.rb b/spec/data_drain/record_spec.rb
index 8b8c8af..78a5721 100644
--- a/spec/data_drain/record_spec.rb
+++ b/spec/data_drain/record_spec.rb
@@ -206,5 +206,23 @@
       expect(path).to include("year=2026")
       expect(path).to include("month=3")
     end
+
+    it "usa wildcard cuando falta una partition key" do
+      path = record_class.send(:build_query_path, { year: 2026 })
+      expect(path).to include("year=2026")
+      expect(path).to include("month=*")
+    end
+
+    it "usa wildcards para todas las partition keys faltantes" do
+      path = record_class.send(:build_query_path, {})
+      expect(path).to include("year=*")
+      expect(path).to include("month=*")
+    end
+
+    it "trata valor cero (falsy) como valor legitimo, no como ausente" do
+      path = record_class.send(:build_query_path, { year: 2026, month: 0 })
+      expect(path).to include("year=2026")
+      expect(path).to include("month=0")
+    end
   end
 end