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aea7b6a66b
Add to DescribeTable's output for VectorIndexes two fields - IndexStatus and Backfilling - which are intended to exactly mirror these two fields that exist for GlobalSecondaryIndexes: When a vector index is added, IndexStatus is "CREATING" before the index is usable, and "ACTIVE" when it is finally usable for a Query. During "CREATING" phase, "Backfilling" may be set to true when the index is currently being backfilled (the table is scaned and an index is built). A user is expected to call DescribeTable in a loop after creating a vector index (via either CreateTable and UpdateTable) and only call Query on the index after the IndexStatus is finally ACTIVE. Calling Query earlier, while IndexStatus is still CREATING, will result in an error. In the current implementation, Alternator does not track the state of the vector index, so it needs to contact the vector store to inquire about the state of the index - using a new function introduced in this patch that uses an existing vector-store API. This makes DescribeTable slower on tables that have vector indexes, because the vector store is contacted on every DescribeTable call. Signed-off-by: Nadav Har'El <nyh@scylladb.com>