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Correct constness of system attributes in heap.c & prerequisites.

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This allows the compiler / linker to mark affected pages as read-only.

There's a fair number of pre-requisite changes, to allow the const
properly be propagated. Most of consts were already required for
correctness anyway, just not represented on the type-level.  Arguably
we could be more aggressive in using consts in related code, but..

This requires using a few of the types underlying typedefs that
removes pointers (e.g. const NameData *) as declaring the typedefed
type constant doesn't have the same meaning (it makes the variable
const, not what it points to).

Discussion: https://postgr.es/m/20181015200754.7y7zfuzsoux2c4ya@alap3.anarazel.de
This commit is contained in:
Andres Freund
2018-10-16 09:44:43 -07:00
parent c015ccb306
commit 02a30a09f9
11 changed files with 32 additions and 31 deletions
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2
src/backend/optimizer/util/plancat.c
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@ -1692,7 +1692,7 @@ build_index_tlist(PlannerInfo *root, IndexOptInfo *index,
if (indexkey != 0)
{
/* simple column */
Form_pg_attribute att_tup;
const FormData_pg_attribute *att_tup;
if (indexkey < 0)
att_tup = SystemAttributeDefinition(indexkey,