smiklosovic commented on code in PR #3562:
URL: https://github.com/apache/cassandra/pull/3562#discussion_r1916839065


##########
src/java/org/apache/cassandra/cql3/statements/UpdateStatement.java:
##########
@@ -348,4 +366,34 @@ public AuditLogContext getAuditLogContext()
     {
         return new AuditLogContext(AuditLogEntryType.UPDATE, keyspace(), 
table());
     }
+
+    public static void evaluateConstraintsForRow(Row row)
+    {
+        Iterator<Cell<?>> cellIt = row.cells().iterator();

Review Comment:
   @bbotella I can imagine that TableMetadata would hold list for columns which 
have some constraints. Then we would do `row.getCell(columnWithConstraint)`. If 
it does not return null, then we get cellData and call `evaluateConstraint`.
   
   if we have a table with 50 columns and we have constraint just on one 
column, what we do now is that we will iterate over all 50 columns just to 
check one constraint.
   
   Why not to have a list of columns (ColumnMetadata) which have constraints 
and check only these? In 50/1 scenario, you will just check one cell, not 50.



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