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a9ed875fdc
When doing record typmod remapping, tqueue.c did fresh catalog lookups for each tuple it processed, which was pretty horrible performance-wise (it seemed to about halve the already none-too-quick speed of bulk reads in parallel mode). Worse, it insisted on putting bits of that data into TopMemoryContext, from where it never freed them, causing a session-lifespan memory leak. (I suppose this was coded with the idea that the sender process would quit after finishing the query --- but the receiver uses the same code.) Restructure to avoid repetitive catalog lookups and to keep that data in a query-lifespan context, in or below the context where the TQueueDestReceiver or TupleQueueReader itself lives. Fix some other bugs such as continuing to use a tupledesc after releasing our refcount on it. Clean up cavalier datatype choices (typmods are int32, please, not int, and certainly not Oid). Improve comments and error message wording. |
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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/.