Correct override of DateTimeFormatString

Author: alex-kulakov

Orm/Xtensive.Orm.Oracle/Sql.Drivers.Oracle/v09/Translator.cs

@@ -39,7 +39,7 @@ internal class Translator : SqlTranslator
     /// <inheritdoc/>
     public override string TimeSpanFormatString => "(INTERVAL '{0}{1} {2}:{3}:{4}.{5:000}' DAY(6) TO SECOND(3))";
 
-    public string DateTimeOffsetFormatString => @"'(TIMESTAMP '\'yyyy\-MM\-dd HH\:mm\:ss\.fff\ zzz\'\)";
+    public override string DateTimeOffsetFormatString => @"'(TIMESTAMP '\'yyyy\-MM\-dd HH\:mm\:ss\.fff\ zzz\'\)";
 
     public override void Initialize()
     {

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

@@ -66,7 +66,7 @@ public SqlFunctionTypeTranslations(int count)
     /// <inheritdoc/>
     public override string DdlStatementDelimiter => ";";
 
-    public string DateTimeOffsetFormatString => @"\'yyyyMMdd HHmmss.ffffff zzz\''::timestamp(6) with time zone'";
+    public override string DateTimeOffsetFormatString => @"\'yyyyMMdd HHmmss.ffffff zzz\''::timestamp(6) with time zone'";
 
     public override void Initialize()
     {

Orm/Xtensive.Orm.SqlServer/Sql.Drivers.SqlServer/v10/Translator.cs

@@ -20,7 +20,7 @@ internal class Translator : v09.Translator
     /// <inheritdoc/>
     public override string TimeOnlyFormatString => @"'cast ('\'HH\:mm\:ss\.fffffff\'' as time)'";
 
-    public string DateTimeOffsetFormatString => @"'cast ('\'yyyy\-MM\-dd HH\:mm\:ss\.fffffff\ zzz\'' as datetimeoffset)'";
+    public override string DateTimeOffsetFormatString => @"'cast ('\'yyyy\-MM\-dd HH\:mm\:ss\.fffffff\ zzz\'' as datetimeoffset)'";
 
     /// <inheritdoc/>
     public override void Translate(SqlCompilerContext context, Ddl.SqlCreateIndex node, CreateIndexSection section)

Orm/Xtensive.Orm.Sqlite/Sql.Drivers.Sqlite/v3/Translator.cs

@@ -29,7 +29,7 @@ internal class Translator : SqlTranslator
     /// <inheritdoc/>
     public override string TimeOnlyFormatString => @"\'HH\:mm\:ss.fffffff\'";
 
-    public virtual string DateTimeOffsetFormatString => @"\'yyyy\-MM\-dd HH\:mm\:ss.fffK\'";
+    public override string DateTimeOffsetFormatString => @"\'yyyy\-MM\-dd HH\:mm\:ss.fffK\'";
 
     /// <inheritdoc/>
     public override string TimeSpanFormatString => @"{0}{1}";