[#5081] [#5082] Fix for SQL Server

jOOQ/src/main/java/org/jooq/impl/AlterTableImpl.java

@@ -367,13 +367,24 @@ final class AlterTableImpl extends AbstractQuery implements
 
 
 
-        {
-            accept0(ctx);
-        }
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+        accept0(ctx);
     }
 
     private final void accept0(Context<?> ctx) {
-        SQLDialect family = ctx.configuration().dialect().family();
+        SQLDialect family = ctx.family();
 
         ctx.start(ALTER_TABLE_TABLE)
            .keyword("alter table").sql(' ').visit(table)
@@ -645,6 +656,32 @@ final class AlterTableImpl extends AbstractQuery implements
 
 
 
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