Replace try_collect + full-buffer conversion in the Stream branch of
from_query_result with incremental per-batch merging via the shared
merge_batch path, so record batches are dropped as soon as they are
consumed instead of all coexisting in memory.
- Add ColumnLayout to dedupe schema inference shared by both paths
- Add SeriesKeyLookup (Equivalent-based borrow lookup) so series keys
are looked up by borrowed label slices without materializing owned
keys per lookup
- Empty streams short-circuit to empty data before schema inference
- Add stream-side mixed histogram + Vector dual-path equivalence test
Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>
discord9
bfe895943c