Horton

Make SPI_prepare argtypes argument const

Peter Eisentraut <peter@eisentraut.org>

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From: Peter Eisentraut <peter@eisentraut.org>
To: pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2026-06-11T09:22:10Z
Lists: pgsql-hackers

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This changes the argtypes argument of SPI_prepare(),
SPI_prepare_cursor(), SPI_cursor_open_with_args(), and
SPI_execute_with_args() from Oid *argtypes to const Oid *argtypes.
The underlying functions were already receptive to that, so this
doesn't require any significant changes beyond the function signatures
and some internal variables.

Commit 28972b6fc3dc recently introduced a case where a const had to be
cast away before calling these functions.  This is fixed here.

Commits

  1. Make SPI_prepare argtypes argument const

  2. Fixes for SPI "const Datum *" use

  3. Add support for importing statistics from remote servers.