CR 199/D523 (l -> left, lattr -> left_attr, r -> right)
CR 199/D524 (renamed outer_join vars)
CR 199/D525 (renamed inner_join vars)
CR 199/D528 (moved code from op.hpp into op.cc)
CR 199/589 (moved shard_data out of lazy_datum_stream_t)
CR 199/D603 (fixed if statement)
CR 199/D604 (fixed pointer comparison)
CR 199/D606 etc. (moved magic number into context)
CR 199/D602 (changed class hierarchy of runtime_exc_t)
CR 199/D610 (brace placement)
CR 199/D487 (any_ql_exc_t -> base_exc_t)
CR 199/D646 (fixed implicit_var name)
CR 199/D633 (de-templated exc_t constructor)
CR 199/D657 (removed commented debugfs)