Removed copy of cast translation + Fixed Set translation

Author: alex-kulakov

Orm/Xtensive.Orm.MySql/Sql.Drivers.MySql/v8_0/Compiler.cs

@@ -4,10 +4,34 @@
 // Created by: Alexey Kulakov
 // Created:    2022.02.03
 
+using Xtensive.Sql.Compiler;
+using Xtensive.Sql.Dml;
+
 namespace Xtensive.Sql.Drivers.MySql.v8_0
 {
   internal class Compiler : v5_7.Compiler
   {
+    /// <inheritdoc/>
+    public override void Visit(SqlQueryExpression node)
+    {
+      using (context.EnterScope(node)) {
+        bool needOpeningParenthesis = true;
+        bool needClosingParenthesis = true;
+
+        AppendTranslatedEntry(node);
+        _ = context.Output.Append("(");
+        node.Left.AcceptVisitor(this);
+        _ = context.Output.Append(")");
+        AppendTranslated(node.NodeType);
+        AppendTranslated(node, QueryExpressionSection.All);
+        _ = context.Output.Append("(");
+        node.Right.AcceptVisitor(this);
+        _ = context.Output.Append(")");
+        AppendTranslatedExit(node);
+      }
+    }
+
+
     // Constructors
 
     public Compiler(SqlDriver driver)

Orm/Xtensive.Orm.MySql/Sql.Drivers.MySql/v8_0/Translator.cs

@@ -12,21 +12,6 @@ namespace Xtensive.Sql.Drivers.MySql.v8_0
 {
   internal class Translator : v5_7.Translator
   {
-    /// <inheritdoc/>
-    public override string Translate(SqlCompilerContext context, SqlCast node, NodeSection section)
-    {
-      if (node.Type.Type==SqlType.DateTime)
-        switch (section) {
-        case NodeSection.Entry:
-          return "CAST(";
-        case NodeSection.Exit:
-          return "AS " + Translate(node.Type) + "(6))";
-        default:
-          throw new ArgumentOutOfRangeException("section");
-        }
-      return base.Translate(context, node, section);
-    }
-
     // Constructors
 
     public Translator(SqlDriver driver)