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We had some hacks in ruleutils.c to cope with various odd transformations that the optimizer could do on a CASE foo WHEN "CaseTestExpr = RHS" clause. However, the fundamental impossibility of covering all cases was exposed by Heikki, who pointed out that the "=" operator could get replaced by an inlined SQL function, which could contain nearly anything at all. So give up on the hacks and just print the expression as-is if we fail to recognize it as "CaseTestExpr = RHS". (We must cover that case so that decompiled rules print correctly; but we are not under any obligation to make EXPLAIN output be 100% valid SQL in all cases, and already could not do so in some other cases.) This approach requires that we have some printable representation of the CaseTestExpr node type; I used "CASE_TEST_EXPR". Back-patch to all supported branches, since the problem case fails in all. |
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.