Apart from conditional statements, there may be other reading statements
in a batch, e.g. manipulating lists. We must not include rows fetched
for them into the CAS result set. For instance, the following CAS batch:
create table t(p int, c int, i int, l list<int>, primary key(p, c));
insert into t(p, c, i) values(1, 1, 1)
insert into t(p, c, i, l) values(1, 1, 1, [1, 2, 3])
begin batch
update t set i=3 where p=1 and c=1 if i=2
update t set l=l-[2] where p=1 and c=2
apply batch;
is supposed to return
[applied] | p | c | i
----------+---+---+---
False | 1 | 1 | 1
not
[applied] | p | c | i
----------+---+---+---
False | 1 | 1 | 1
False | 1 | 2 | 1
To filter out such collateral rows from the result set, let's mark rows
checked by conditional statements with a special flag.
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