Use correct parameter in query based on type mapping

src/EFCore.Relational/Query/QuerySqlGenerator.cs

@@ -598,21 +598,33 @@ protected override Expression VisitSqlParameter(SqlParameterExpression sqlParame
         var invariantName = sqlParameterExpression.Name;
         var parameterName = sqlParameterExpression.Name;
 
-        if (_relationalCommandBuilder.Parameters
-            .All(
-                p => p.InvariantName != parameterName
-                    || (p is TypeMappedRelationalParameter typeMappedRelationalParameter
-                        && (typeMappedRelationalParameter.RelationalTypeMapping.StoreType != sqlParameterExpression.TypeMapping!.StoreType
-                            || typeMappedRelationalParameter.RelationalTypeMapping.Converter
-                            != sqlParameterExpression.TypeMapping!.Converter))))
+        // Try to see if a parameter already exists - if so, just integrate the same placeholder into the SQL instead of sending the same
+        // data twice.
+        // Note that if the type mapping differs, we do send the same data twice (e.g. the same string may be sent once as Unicode, once as
+        // non-Unicode).
+        var parameter = _relationalCommandBuilder.Parameters.FirstOrDefault(
+            p =>
+                p.InvariantName == parameterName
+                && p is TypeMappedRelationalParameter typeMappedRelationalParameter
+                && string.Equals(
+                    typeMappedRelationalParameter.RelationalTypeMapping.StoreType, sqlParameterExpression.TypeMapping!.StoreType,
+                    StringComparison.OrdinalIgnoreCase)
+                && typeMappedRelationalParameter.RelationalTypeMapping.Converter == sqlParameterExpression.TypeMapping!.Converter);
+
+        if (parameter is null)
         {
             parameterName = GetUniqueParameterName(parameterName);
+
             _relationalCommandBuilder.AddParameter(
                 invariantName,
                 _sqlGenerationHelper.GenerateParameterName(parameterName),
                 sqlParameterExpression.TypeMapping!,
                 sqlParameterExpression.IsNullable);
         }
+        else
+        {
+            parameterName = ((TypeMappedRelationalParameter)parameter).Name;
+        }
 
         _relationalCommandBuilder
             .Append(_sqlGenerationHelper.GenerateParameterNamePlaceholder(parameterName));

test/EFCore.Relational.Specification.Tests/Query/GearsOfWarQueryRelationalTestBase.cs

@@ -21,7 +21,7 @@ public virtual Task Parameter_used_multiple_times_take_appropriate_inferred_type
         var place = "Seattle";
         return AssertQuery(
             async,
-            ss => ss.Set<City>().Where(e => e.Nation == place || e.Location == place));
+            ss => ss.Set<City>().Where(e => e.Nation == place || e.Location == place || e.Location == place));
     }
 
     public override async Task Correlated_collection_with_distinct_not_projecting_identifier_column_also_projecting_complex_expressions(

test/EFCore.SqlServer.FunctionalTests/Query/GearsOfWarQuerySqlServerTest.cs

@@ -9413,7 +9413,7 @@ public override async Task Parameter_used_multiple_times_take_appropriate_inferr
 
 SELECT [c].[Name], [c].[Location], [c].[Nation]
 FROM [Cities] AS [c]
-WHERE [c].[Nation] = @__place_0 OR [c].[Location] = @__place_0_1
+WHERE [c].[Nation] = @__place_0 OR [c].[Location] = @__place_0_1 OR [c].[Location] = @__place_0_1
 """);
     }
 

test/EFCore.SqlServer.FunctionalTests/Query/NorthwindMiscellaneousQuerySqlServerTest.cs

@@ -4779,7 +4779,7 @@ public override async Task Comparing_to_fixed_string_parameter(bool async)
 
 SELECT [c].[CustomerID]
 FROM [Customers] AS [c]
-WHERE @__prefix_0 = N'' OR LEFT([c].[CustomerID], LEN(@__prefix_0_1)) = @__prefix_0
+WHERE @__prefix_0 = N'' OR LEFT([c].[CustomerID], LEN(@__prefix_0_1)) = @__prefix_0_1
 """);
     }
 

test/EFCore.SqlServer.FunctionalTests/Query/NorthwindQueryFiltersQuerySqlServerTest.cs

@@ -32,7 +32,7 @@ public override async Task Count_query(bool async)
 
 SELECT COUNT(*)
 FROM [Customers] AS [c]
-WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 """);
     }
 
@@ -47,7 +47,7 @@ public override async Task Materialized_query(bool async)
 
 SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
 FROM [Customers] AS [c]
-WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 """);
     }
 
@@ -63,7 +63,7 @@ public override async Task Find(bool async)
 
 SELECT TOP(1) [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
 FROM [Customers] AS [c]
-WHERE (@__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0) AND [c].[CustomerID] = @__p_0
+WHERE (@__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1) AND [c].[CustomerID] = @__p_0
 """);
     }
 
@@ -78,7 +78,7 @@ public override async Task Materialized_query_parameter(bool async)
 
 SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
 FROM [Customers] AS [c]
-WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 """);
     }
 
@@ -93,7 +93,7 @@ public override async Task Materialized_query_parameter_new_context(bool async)
 
 SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
 FROM [Customers] AS [c]
-WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 """,
             //
 """
@@ -102,7 +102,7 @@ public override async Task Materialized_query_parameter_new_context(bool async)
 
 SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
 FROM [Customers] AS [c]
-WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 """);
     }
 
@@ -117,7 +117,7 @@ public override async Task Projection_query_parameter(bool async)
 
 SELECT [c].[CustomerID]
 FROM [Customers] AS [c]
-WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 """);
     }
 
@@ -132,7 +132,7 @@ public override async Task Projection_query(bool async)
 
 SELECT [c].[CustomerID]
 FROM [Customers] AS [c]
-WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 """);
     }
 
@@ -153,11 +153,11 @@ public override async Task Include_query(bool async)
     LEFT JOIN (
         SELECT [c0].[CustomerID], [c0].[CompanyName]
         FROM [Customers] AS [c0]
-        WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c0].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+        WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c0].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
     ) AS [t] ON [o].[CustomerID] = [t].[CustomerID]
     WHERE ([t].[CustomerID] IS NOT NULL) AND ([t].[CompanyName] IS NOT NULL)
 ) AS [t0] ON [c].[CustomerID] = [t0].[CustomerID]
-WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0)) = @__ef_filter__TenantPrefix_0
+WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 ORDER BY [c].[CustomerID], [t0].[OrderID]
 """);
     }
@@ -189,7 +189,7 @@ public override async Task Included_many_to_one_query(bool async)
 LEFT JOIN (
     SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
     FROM [Customers] AS [c]
-    WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+    WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 ) AS [t] ON [o].[CustomerID] = [t].[CustomerID]
 WHERE ([t].[CustomerID] IS NOT NULL) AND ([t].[CompanyName] IS NOT NULL)
 """);
@@ -213,7 +213,7 @@ public override async Task Project_reference_that_itself_has_query_filter_with_a
     LEFT JOIN (
         SELECT [c].[CustomerID], [c].[CompanyName]
         FROM [Customers] AS [c]
-        WHERE @__ef_filter__TenantPrefix_1 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_1_1)) = @__ef_filter__TenantPrefix_1
+        WHERE @__ef_filter__TenantPrefix_1 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_1_1)) = @__ef_filter__TenantPrefix_1_1
     ) AS [t] ON [o0].[CustomerID] = [t].[CustomerID]
     WHERE ([t].[CustomerID] IS NOT NULL) AND ([t].[CompanyName] IS NOT NULL)
 ) AS [t0] ON [o].[OrderID] = [t0].[OrderID]
@@ -239,7 +239,7 @@ public override async Task Navs_query(bool async)
     LEFT JOIN (
         SELECT [c0].[CustomerID], [c0].[CompanyName]
         FROM [Customers] AS [c0]
-        WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c0].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+        WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c0].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
     ) AS [t] ON [o].[CustomerID] = [t].[CustomerID]
     WHERE ([t].[CustomerID] IS NOT NULL) AND ([t].[CompanyName] IS NOT NULL)
 ) AS [t0] ON [c].[CustomerID] = [t0].[CustomerID]
@@ -252,13 +252,13 @@ public override async Task Navs_query(bool async)
         LEFT JOIN (
             SELECT [c1].[CustomerID], [c1].[CompanyName]
             FROM [Customers] AS [c1]
-            WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c1].[CompanyName], LEN(@__ef_filter__TenantPrefix_0)) = @__ef_filter__TenantPrefix_0
+            WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c1].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
         ) AS [t3] ON [o1].[CustomerID] = [t3].[CustomerID]
         WHERE ([t3].[CustomerID] IS NOT NULL) AND ([t3].[CompanyName] IS NOT NULL)
     ) AS [t2] ON [o0].[OrderID] = [t2].[OrderID]
     WHERE [o0].[Quantity] > @__ef_filter___quantity_1
 ) AS [t1] ON [t0].[OrderID] = [t1].[OrderID]
-WHERE (@__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0)) = @__ef_filter__TenantPrefix_0) AND [t1].[Discount] < CAST(10 AS real)
+WHERE (@__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1) AND [t1].[Discount] < CAST(10 AS real)
 """);
     }
 
@@ -281,7 +281,7 @@ public void FromSql_is_composed()
 FROM (
     select * from Customers
 ) AS [m]
-WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([m].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([m].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 """);
     }
 
@@ -307,7 +307,7 @@ public void FromSql_is_composed_when_filter_has_navigation()
 LEFT JOIN (
     SELECT [c].[CustomerID], [c].[CompanyName]
     FROM [Customers] AS [c]
-    WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+    WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 ) AS [t] ON [m].[CustomerID] = [t].[CustomerID]
 WHERE ([t].[CustomerID] IS NOT NULL) AND ([t].[CompanyName] IS NOT NULL)
 """);
@@ -325,7 +325,7 @@ public override void Compiled_query()
 
 SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
 FROM [Customers] AS [c]
-WHERE (@__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0) AND [c].[CustomerID] = @__customerID
+WHERE (@__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1) AND [c].[CustomerID] = @__customerID
 """,
             //
 """
@@ -335,7 +335,7 @@ public override void Compiled_query()
 
 SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
 FROM [Customers] AS [c]
-WHERE (@__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0) AND [c].[CustomerID] = @__customerID
+WHERE (@__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1) AND [c].[CustomerID] = @__customerID
 """);
     }
 
@@ -353,7 +353,7 @@ public override async Task Entity_Equality(bool async)
 LEFT JOIN (
     SELECT [c].[CustomerID], [c].[CompanyName]
     FROM [Customers] AS [c]
-    WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+    WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 ) AS [t] ON [o].[CustomerID] = [t].[CustomerID]
 WHERE ([t].[CustomerID] IS NOT NULL) AND ([t].[CompanyName] IS NOT NULL)
 """);
@@ -380,7 +380,7 @@ public override async Task Included_many_to_one_query2(bool async)
 LEFT JOIN (
     SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
     FROM [Customers] AS [c]
-    WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0
+    WHERE @__ef_filter__TenantPrefix_0 = N'' OR LEFT([c].[CompanyName], LEN(@__ef_filter__TenantPrefix_0_1)) = @__ef_filter__TenantPrefix_0_1
 ) AS [t] ON [o].[CustomerID] = [t].[CustomerID]
 WHERE ([t].[CustomerID] IS NOT NULL) AND ([t].[CompanyName] IS NOT NULL)
 """);

test/EFCore.SqlServer.FunctionalTests/Query/TPCGearsOfWarQuerySqlServerTest.cs

@@ -11939,7 +11939,7 @@ public override async Task Parameter_used_multiple_times_take_appropriate_inferr
 
 SELECT [c].[Name], [c].[Location], [c].[Nation]
 FROM [Cities] AS [c]
-WHERE [c].[Nation] = @__place_0 OR [c].[Location] = @__place_0_1
+WHERE [c].[Nation] = @__place_0 OR [c].[Location] = @__place_0_1 OR [c].[Location] = @__place_0_1
 """);
     }
 

test/EFCore.SqlServer.FunctionalTests/Query/TPTGearsOfWarQuerySqlServerTest.cs

@@ -10225,7 +10225,7 @@ public override async Task Parameter_used_multiple_times_take_appropriate_inferr
 
 SELECT [c].[Name], [c].[Location], [c].[Nation]
 FROM [Cities] AS [c]
-WHERE [c].[Nation] = @__place_0 OR [c].[Location] = @__place_0_1
+WHERE [c].[Nation] = @__place_0 OR [c].[Location] = @__place_0_1 OR [c].[Location] = @__place_0_1
 """);
     }
 

test/EFCore.SqlServer.FunctionalTests/Query/TemporalGearsOfWarQuerySqlServerTest.cs

@@ -3252,7 +3252,7 @@ public override async Task Parameter_used_multiple_times_take_appropriate_inferr
 
 SELECT [c].[Name], [c].[Location], [c].[Nation], [c].[PeriodEnd], [c].[PeriodStart]
 FROM [Cities] FOR SYSTEM_TIME AS OF '2010-01-01T00:00:00.0000000' AS [c]
-WHERE [c].[Nation] = @__place_0 OR [c].[Location] = @__place_0_1
+WHERE [c].[Nation] = @__place_0 OR [c].[Location] = @__place_0_1 OR [c].[Location] = @__place_0_1
 """);
     }
 
@@ -9794,7 +9794,7 @@ public override async Task EF_Property_based_Include_navigation_on_derived_type(
 """);
     }
 
-    // Sequence contains no elements due to temporal filter 
+    // Sequence contains no elements due to temporal filter
     public override Task ElementAt_basic_with_OrderBy(bool async)
         => Task.CompletedTask;
 

test/EFCore.Sqlite.FunctionalTests/Query/GearsOfWarQuerySqliteTest.cs

@@ -2903,7 +2903,7 @@ public override async Task Parameter_used_multiple_times_take_appropriate_inferr
 
 SELECT "c"."Name", "c"."Location", "c"."Nation"
 FROM "Cities" AS "c"
-WHERE "c"."Nation" = @__place_0 OR "c"."Location" = @__place_0
+WHERE "c"."Nation" = @__place_0 OR "c"."Location" = @__place_0 OR "c"."Location" = @__place_0
 """);
     }