Remove ReadItem from BatchContainer #579
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Remove ReadItem<'a> from BatchContainer, introduce a BatchIndex trait that behaves similarly to columnar's Index trait: It has an associated type (not lifetimed) and implementations use the lifetime of
&'a Self
to express their constraints.The wrinkle it introduces is that the trace reader/cursor/batch traits need to gain functions to work with (G)ATs where the behavior was previously encoded in
IntoOwned
. I'd like to remove theIntoOwned
trait because it makes it hard for other crates to use Differential, but that'd mean we have to add more functions to work with keys and values, too.I started off the wrong branch, so there's a bunch of unrelated changes. Only look at the last commit (3e97287)