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Sylvain Lebresne commented on CASSANDRA-6477:
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bq. IMO this should be the default, and WITH {{DENORMALIZED (...)}} syntax
could optionally restrict it.
If you mean that {{CREATE GLOBAL INDEX on foo(bar)}} would be equivalent to
denormalizing everything, then I might prefer being careful in the sense that
we may (emphasis on "may") want this to later mean to create the global index
as a true index, without anything denormalized. So my suggestion would be
simply plainly reject a {{CREATE GLOBAL INDEX}} that doesn't have a
{{DENORMALIZED}} clause (so no default in a way). Though I would agree that
{{DENORMALIZED *}} should be there as it's probably what we want to recommend
as de-facto default.
> Global indexes
> --------------
>
> Key: CASSANDRA-6477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6477
> Project: Cassandra
> Issue Type: New Feature
> Components: API, Core
> Reporter: Jonathan Ellis
> Assignee: Carl Yeksigian
> Labels: cql
> Fix For: 3.0
>
>
> Local indexes are suitable for low-cardinality data, where spreading the
> index across the cluster is a Good Thing. However, for high-cardinality
> data, local indexes require querying most nodes in the cluster even if only a
> handful of rows is returned.
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