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This is because can_coerce_type thinks that RECORD can be cast to any composite type, but coerce_record_to_complex only works for inputs that are RowExprs or whole-row Vars, so we get a hard failure on a CaseTestExpr. Perhaps these corner cases ought to be fixed so that coerce_to_target_type actually returns NULL as per its specification, rather than failing ... but for the moment an extra check here is the path of least resistance. |
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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. 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/.