index

A schema object that contains an entry for each value that appears in the indexed column(s) of the table or cluster and provides direct, fast access to rows. A partitioned index consists of partitions containing an entry for each value that appears in the indexed column(s) of the table. A function-based index is an index on column expressions. It enables you to construct queries that evaluate the value returned by an expression, which in turn may include functions (built-in or user-defined) and constants.

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