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https://support.oracle.com/knowledge/Oracle%20Database%20Products/334342_1.html
Oracle Text - Version 8.1.7.0 to 12.2.0.1 [Release 8.1.7 to 12.2]: Catsearch Index Does Not Support Functional Invocation, Query Fails with DRG-10849 Catsearch Index Does Not Support Functional Invocation, Query Fails with DRG-10849
https://support.oracle.com/knowledge/Oracle%20Database%20Products/2398630_1.html
Nov 17, 2019 · DRG-10849: Catsearch Does Not Support Functional Invocation (Doc ID 2398630.1) Last updated on NOVEMBER 17, 2019. Applies to: Oracle Text - Version 12.1.0.2 and later Information in this document applies to any platform. Symptoms
https://stackoverflow.com/questions/19495181/oracle-text-catsearch-does-not-support-functional-invocation
The hint doesn't work because what Oracle needs to do: check the records that satisfy the CATSEARCH condition. Some of those that do not satisfy it may satisfy the other condition, tho, so Oracle has to go through all rows again (or use index on customer_id).
https://community.oracle.com/thread/2426815
This content has been marked as final. Show 1 reply. 1. Re: DRG-10849 catsearch does not support functional invocation Mustafa KALAYCI Aug 8, 2012 9:30 AM (in response to kerberos5) there is a topic which is older. maybe it helped.
https://community.oracle.com/thread/677410
Jul 04, 2008 · However, CTXCAT indexes do not support functional lookups, so this is impossible. The solution is to use a hint which persuades the optimizer to always drive the query from the CTXCAT index. I know this is kind of messy, but our developers tell me there is no simple way to tell the optimizer that such as call is impossible (or infinitely expensive).
https://www.tek-tips.com/viewthread.cfm?qid=291194
DRG-10849: catsearch does not support functional invocation DRG-10599: column is not indexed When I run the subquery alone, it works fine as well as the main query.
https://docs.oracle.com/cd/A91202_01/901_doc/text.901/a90121/csql3.htm
This operator does not support the reverse behavior, also known as functional invocation. In this method, Oracle first retrieves the rows that satisfy the structured_query condition and then applies the text_query condition.
https://www.oraexcel.com/oracle-10gR1-DRG-10849
Description: catsearch does not support functional invocation Cause: the query plan for your query is invoking a catsearch operator functionally rather than as an index rowsource. The catsearch operator does not support functional invocation Action: add optimizer hints so that all catsearch operators are performed through index scans
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