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Make SPI_fnumber() reject dropped columns.

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There's basically no scenario where it's sensible for this to match
dropped columns, so put a test for dropped-ness into SPI_fnumber()
itself, and excise the test from the small number of callers that
were paying attention to the case.  (Most weren't :-(.)

In passing, normalize tests at call sites: always reject attnum <= 0
if we're disallowing system columns.  Previously there was a mixture
of "< 0" and "<= 0" tests.  This makes no practical difference since
SPI_fnumber() never returns 0, but I'm feeling pedantic today.

Also, in the places that are actually live user-facing code and not
legacy cruft, distinguish "column not found" from "can't handle
system column".

Per discussion with Jim Nasby; thi supersedes his original patch
that just changed the behavior at one call site.

Discussion: <b2de8258-c4c0-1cb8-7b97-e8538e5c975c@BlueTreble.com>
This commit is contained in:
Tom Lane
2016-11-08 13:11:15 -05:00
parent 36ac6d0e79
commit 6d30fb1f75
11 changed files with 25 additions and 25 deletions
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4
contrib/spi/moddatetime.c
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@ -84,9 +84,9 @@ moddatetime(PG_FUNCTION_ARGS)
/*
* This is where we check to see if the field we are supposed to update
* even exists. The above function must return -1 if name not found?
* even exists.
*/
if (attnum < 0)
if (attnum <= 0)
ereport(ERROR,
(errcode(ERRCODE_TRIGGERED_ACTION_EXCEPTION),
errmsg("\"%s\" has no attribute \"%s\"",