e0e4ebe384
When tracking nested statements, contrib/pg_stat_statements formerly double-counted the execution costs of utility statements that directly contain an executable statement, such as EXPLAIN and DECLARE CURSOR. This was not obvious since the ProcessUtility and Executor hooks would each add their measured costs to the same stats table entry. However, with the new implementation that hashes utility and plannable statements differently, this showed up as seemingly-duplicate stats entries. Fix that by disabling the Executor hooks when the query has a queryId of zero, which was the case already for such statements but is now more clearly specified in the code. (The zero queryId was causing problems anyway because all such statements would add to a single bogus entry.) The PREPARE/EXECUTE case still results in counting the same execution in two different stats table entries, but it should be much less surprising to users that there are two entries in such cases. In passing, include a CommonTableExpr's ctename in the query hash. I had left it out originally on the grounds that we wanted to omit all inessential aliases, but since RTE_CTE RTEs are hashing their referenced names, we'd better hash the CTE names too to make sure we don't hash semantically different queries the same. |
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| GNUmakefile.in | ||
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| README | ||
| README.git | ||
| aclocal.m4 | ||
| configure | ||
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README
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/.