This gets rid of repetitive get_typlen calls in postquel_sub_params, which show up as costing a few percent of the runtime in simple test cases (more with more parameters). In combination with the preceding patches, this gets us most of the way back down to the amount of per-call overhead that functions.c had before commit 0dca5d68d. There are some more things that could be done, but this seems like an okay place to stop for v18.
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.
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General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
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