One of the unfortunate anti-features of cql_test_env (the framework used
in our CQL tests that are written in C++) is that it needs to repeat
various bizarre initializations steps done in main.cc, otherwise various
requests work incorrectly. One of these steps that main.cc is to initialize
various "schema extensions" which some of the Scylla features need to work
correctly.
We remembered to initialize some schema extensions in cql_test_env, but
forgot others. The one I will need in the following patch is the "tags"
extension, which we need to mark materialized views used by local
secondary indexes as "synchronous_updates" - without this patch the LSI
tests in secondary_index_test.cc will crash.
In addition to adding the missing extension, this patch also replaces
the segmentation-fault crash when it's missing (caused by a dynamic
cast failure) by a clearer on_internal_error() - so if we ever have
this bug again, it will be easier to debug.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
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