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Error after upgrading to 19C - Connect By Required

edited Sep 19, 2019 5:01AM in SQL Language (MOSC) 1 commentAnswered

We recently upgraded from Oracle 12c Enterprise Edition Release 12.1.0.2.0 to Oracle Database 19c Enterprise Edition Release 19.0.0.0.0

We have a complex large dynamic SQL created in a Java that works perfectly in Oracle 12, but now gives the following error in Oracle 19.

ORA-01788: CONNECT BY clause required in this query block

We tried setting the system parameter _allow_level_without_connect_by to TRUE, but this did not help.

Can you please review this query and give me a possible correction?

/*
  Oracle Database 11.2 introduced another method for accessing trees: recursive subquery factoring. Aka recursive with.
  This is the ANSI compliant way to build hierarchies in SQL. It's composed of two queries. A base query and a recursive one.

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