let clause does not use qualified index

create default bucket

create only the following indexes:

create index idx1 on default(field1)

create index idx2 on default(log(field1)

run the following queries:

select a from default let a=field1

select a from default let a=log(field1)

you will get back this error:

"No index available on keyspace simple_table_db_52119513_simple_table that matches your query. Use CREATE INDEX or CREATE PRIMARY INDEX to create an index, or check that your expected index is online."