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A query such as "SELECT x UNION SELECT y UNION SELECT z UNION ..." produces a left-deep nested parse tree, which we formerly showed in its full nested glory and with all the possible parentheses. This does little for readability, though, and long UNION lists resulting in excessive indentation are common. Instead, let's omit parentheses and indent all the subqueries at the same level in such cases. This patch skips indentation/parenthesization whenever the lefthand input of a SetOperationStmt is another SetOperationStmt of the same kind and ALL/DISTINCT property. We could teach the code the exact syntactic precedence of set operations and thereby avoid parenthesization in some more cases, but it's not clear that that'd be a readability win: it seems better to parenthesize if the set operation changes. (As an example, if there's one UNION in a long list of UNION ALL, it now stands out like a sore thumb, which seems like a good thing.) Back-patch to 9.3. This completes our response to a complaint from Greg Stark that since commit |
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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/.