[patches] [PATCH V2 1/2] sql: fix non-working 'INDEXED BY' clause

[n.pettik]

Put two commits into one: I don’t see reason to divide them.

Also, add functional tests on INDEXED BY clause.
Now, you are checking only correctness of grammar (and add more than one test)
but "indexed by" should also compel planner use given index:
https://www.sqlite.org/lang_indexedby.html <https://www.sqlite.org/lang_indexedby.html>

You can do it using EXPLAIN QUERY PLAN statement.

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