Barrage Snapshot DHC Breaking Change

[stanbrub]

DHC 0.29.0 introduced a known breaking change the requires upgrading to deephaven-java-client-barrage-dagger:0.29.0. This is captured here: #192.

After upgrading Benchmark to use the new barrage dagger version, a problem was discovered with table snapshots where a table name and column names could be retrieved through the barrage client that contained no rows. Below are the tickets capturing that issue for deephaven-core.

A workaround was offered that is more like the fetchDuration support in Benchmark. This is stated to be more efficient and looks cleaner that the broken way of doing snapshots.

From Nate's investigation: I appear to be able to reproduce. A work around is to use BarrageSession#subscribe (instead of snapshot) and then invoke snapshotEntireTable instead of entireTable (or snapshotPartialTable if that is what you are doing).

• Barrage snapshot can return 0 rows to the client deephaven-core#4675
• BarrageSession Subscription/Snapshot Methods now Return Future<Table> deephaven-core#4676