String routingValue = null;
List<Expression> values = node.values();
List<ColumnIdent> primaryKey = context.table().primaryKey();
for (int i = 0, valuesSize = values.size(); i < valuesSize; i++) {
Expression expression = values.get(i);
Symbol valuesSymbol = process(expression, context);
// implicit type conversion
Reference column = context.columns().get(i);
final ColumnIdent columnIdent = column.info().ident().columnIdent();