Fix build

Author: SergeiPavlov

Orm/Xtensive.Orm/Sql/Compiler/SqlCompiler.cs

@@ -1109,10 +1109,7 @@ public virtual void Visit(SqlDropIndex node)
     /// <param name="node">Statement to visit.</param>
     public virtual void Visit(SqlDropView node) => translator.Translate(context, node);
 
-    public virtual void Visit(SqlTruncateTable node)
-    {
-      context.Output.AppendText(translator.Translate(context, node));
-    }
+    public virtual void Visit(SqlTruncateTable node) => translator.Translate(context, node);
 
     /// <summary>
     /// Visits <see cref="SqlFastFirstRowsHint"/> node and translates its parts.
@@ -1260,7 +1257,7 @@ public virtual void Visit(SqlInsert node)
         var columns = node.Values.Columns;
         if (columns.Count > 0) {
           using (context.EnterCollectionScope()) {
-            foreach (var item in cplumns) {
+            foreach (var item in columns) {
               AppendCollectionDelimiterIfNecessary(AppendColumnDelimiter);
               translator.TranslateIdentifier(context.Output, item.Name);
             }
@@ -1282,13 +1279,16 @@ public virtual void Visit(SqlInsert node)
             var rowCount = node.Values.ValuesByColumn(columns.First()).Count;
             for (int i = 0; i < rowCount; i++) {
               if (i > 0) {
-                context.Output.AppendText(translator.Translate(context, node, InsertSection.NewRow));
+                translator.Translate(context, node, InsertSection.NewRow);
               }
               using var _ = context.EnterCollectionScope();
+              bool firstColumn = true;
               foreach (var column in columns) {
-                if (!context.IsEmpty) {
-                  context.Output.AppendDelimiter(translator.ColumnDelimiter);
+                if (!firstColumn) {
+                  var __ = context.Output.Append(translator.ColumnDelimiter);
+                  AppendSpaceIfNecessary();
                 }
+                firstColumn = false;
                 var item = node.Values.ValuesByColumn(column)[i];
                 item.AcceptVisitor(this);
               }

Orm/Xtensive.Orm/Sql/Compiler/SqlTranslator.cs

@@ -1214,11 +1214,12 @@ public virtual void Translate(SqlCompilerContext context, SqlDropSequence node)
       _ = context.Output.Append(node.Cascade ? " CASCADE" : " RESTRICT");
     }
 
-    public virtual string Translate(SqlCompilerContext context, SqlTruncateTable node)
+    public virtual void Translate(SqlCompilerContext context, SqlTruncateTable node)
     {
-      return "TRUNCATE TABLE " + Translate(context, node.Table);
+      _ = context.Output.Append("TRUNCATE TABLE ");
+      Translate(context, node.Table);
     }
-    
+
     /// <summary>
     /// Translates <see cref="SqlDropTable"/> statement and writes result to to <see cref="SqlCompilerContext.Output"/>.
     /// </summary>
@@ -1254,12 +1255,6 @@ public virtual void Translate(SqlCompilerContext context, SqlDropView node)
       _ = context.Output.Append(node.Cascade ? " CASCADE" : " RESTRICT");
     }
 
-    public virtual string Translate(SqlCompilerContext context, SqlDropTable node)
-    {
-      return "DROP TABLE " + Translate(context, node.Table) + (node.Cascade ? " CASCADE" : " RESTRICT");
-    }
-
-    public virtual string Translate(SqlCompilerContext context, SqlFetch node, FetchSection section)
     /// <summary>
     /// Translates <see cref="SqlFetch"/> statement and writes result to to <see cref="SqlCompilerContext.Output"/>.
     /// </summary>
@@ -1969,7 +1964,7 @@ public virtual void Translate(SqlCompilerContext context, SchemaNode node)
       var dbQualified = node.Schema.Catalog != null
         && context.HasOptions(SqlCompilerNamingOptions.DatabaseQualifiedObjects);
 
-      
+
       if (node.Schema.IsNamesReadingDenied) {
         // if schema is shared we use placeholders to translate
         // schema node in PostCompiler