eric-maynard opened a new pull request, #1378:
URL: https://github.com/apache/polaris/pull/1378
For rest catalogs, `TableOperations.refresh()` can result in an expensive
trip to object storage. Despite this, the method is called quite frequently and
is currently called after every commit when we construct a BaseTable to return
back to a client that requested a commit.
In some cases, the same TableOperations is used for one commit and then is
immediately used for another. We can see this in some tests, such as Iceberg's
`CatalogTests.testUpdateTableSchemaThenRevert`:
```
table.updateSchema().addColumn("col1", StringType.get()).addColumn("col2",
StringType.get()).addColumn("col3", StringType.get()).commit();
table.updateSchema().deleteColumn("col1").deleteColumn("col2").deleteColumn("col3").commit();
```
This PR proposes that the TableOperations can cache the
most-recently-committed metadata and return that when `current` is called so
long as `requestRefresh` has not been called in the meantime.
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