DRG-10849：catsearch does not support functional invocation
错误码
错误描述：catsearch does not support functional invocation
错误原因：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
解决方法：add optimizer hints so that all catsearch operators are performed through index scans
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