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setup_param_list() was allocating a fresh ParamListInfo for each query or expression evaluation requested by a plpgsql function. There was probably once good reason to do it like that, but for a long time we've had a convention that there's a one-to-one mapping between the function's PLpgSQL_datum array and the ParamListInfo slots, which means that a single ParamListInfo can serve all the function's evaluation requests: the data that would need to be passed is the same anyway. In this patch, we retain the pattern of zeroing out the ParamListInfo contents during each setup_param_list() call, because some of the slots may be stale and we don't know exactly which ones. So this patch only saves a palloc/pfree per evaluation cycle and nothing more; still, that seems to be good for a couple percent overall speedup on simple-arithmetic type statements. In future, though, we might be able to improve matters still more by managing the param array contents more carefully. Also, unify the former use of estate->cur_expr with that of paramLI->parserSetupArg; they both were used to point to the active expression, so we can combine the variables into just one. |
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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/.