Better name for extension method

Author: alex-kulakov

Orm/Xtensive.Orm/Orm/Linq/Expressions/ItemProjectorExpression.cs

@@ -145,7 +145,7 @@ public ItemProjectorExpression EnsureEntityIsJoined()
             rightIndex++;
           }
           var offset = dataSource.Header.Length;
-          dataSource = entityExpression.IsNullable || dataSource.CheckIfUseLeftJoin()
+          dataSource = entityExpression.IsNullable || dataSource.CheckIfLeftJoinPrefered()
             ? dataSource.LeftJoin(joinedRs, keyPairs)
             : dataSource.Join(joinedRs, keyPairs);
           EntityExpression.Fill(entityExpression, offset);
@@ -168,7 +168,7 @@ public ItemProjectorExpression EnsureEntityIsJoined()
             rightIndex++;
           }
           var offset = dataSource.Header.Length;
-          dataSource = entityFieldExpression.IsNullable || dataSource.CheckIfUseLeftJoin()
+          dataSource = entityFieldExpression.IsNullable || dataSource.CheckIfLeftJoinPrefered()
             ? dataSource.LeftJoin(joinedRs, keyPairs)
             : dataSource.Join(joinedRs, keyPairs);
           entityFieldExpression.RegisterEntityExpression(offset);

Orm/Xtensive.Orm/Orm/Linq/Translator.Expressions.cs

@@ -1666,7 +1666,7 @@ public void EnsureEntityFieldsAreJoined(EntityExpression entityExpression, ItemP
       int offset = itemProjector.DataSource.Header.Length;
       var oldDataSource = itemProjector.DataSource;
 
-      var newDataSource = entityExpression.IsNullable || oldDataSource.CheckIfUseLeftJoin()
+      var newDataSource = entityExpression.IsNullable || oldDataSource.CheckIfLeftJoinPrefered()
         ? itemProjector.DataSource.LeftJoin(joinedRs, keyPairs)
         : itemProjector.DataSource.Join(joinedRs, keyPairs);
       itemProjector.DataSource = newDataSource;
@@ -1691,7 +1691,7 @@ private void EnsureEntityReferenceIsJoined(EntityFieldExpression entityFieldExpr
 
       var oldDataSource = originalItemProjector.DataSource;
       var offset = oldDataSource.Header.Length;
-      var newDataSource = entityFieldExpression.IsNullable || oldDataSource.CheckIfUseLeftJoin()
+      var newDataSource = entityFieldExpression.IsNullable || oldDataSource.CheckIfLeftJoinPrefered()
         ? oldDataSource.LeftJoin(joinedRs, keyPairs)
         : oldDataSource.Join(joinedRs, keyPairs);
       originalItemProjector.DataSource = newDataSource;

Orm/Xtensive.Orm/Orm/Rse/CompilableProviderExtensions.cs

@@ -213,7 +213,7 @@ public static CompilableProvider MakeVoid(this CompilableProvider source)
       return new VoidProvider(source.Header);
     }
 
-    internal static bool CheckIfUseLeftJoin(this CompilableProvider provider)
+    internal static bool CheckIfLeftJoinPrefered(this CompilableProvider provider)
     {
       var sourceToCheck = (provider is FilterProvider filterProvider) ? filterProvider.Source : provider;
       return (sourceToCheck is ApplyProvider applyProvider && applyProvider.ApplyType == JoinType.LeftOuter) ||