Produces the following output:
D Explain:
D SCAN TABLE fdroid_app
D EXECUTE CORRELATED SCALAR SUBQUERY 0
D SEARCH TABLE fdroid_apk USING INDEX apk_vercode
D EXECUTE CORRELATED SCALAR SUBQUERY 1
D SEARCH TABLE fdroid_app AS innerAppName USING INTEGER PRIMARY KEY (rowid=?)
D EXECUTE CORRELATED SCALAR SUBQUERY 2
D SEARCH TABLE fdroid_package AS pkg USING INTEGER PRIMARY KEY (rowid=?)
D SEARCH TABLE fdroid_installedApp AS installed USING INDEX sqlite_autoindex_fdroid_installedApp_1 (appId=?)
There are two possibilities here, one is the number of correlated sub
queries (three seems a bit excessive). Alterantively, it could be the
fact that one of the inner queries is using a string index (appId=?)
instead of an integer primary key.
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