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Use Params, rather than run-time-modified Const nodes, to handle

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sublink results and COPY's domain constraint checking.  A Const that
isn't really constant is just a Bad Idea(tm).  Remove hacks in
parse_coerce and other places that were needed because of the former
klugery.
This commit is contained in:
Tom Lane
2002-11-26 03:01:59 +00:00
parent ac47950238
commit ea0b5c8569
9 changed files with 166 additions and 190 deletions
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4
src/include/nodes/primnodes.h
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@@ -10,7 +10,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: primnodes.h,v 1.69 2002/11/25 21:29:42 tgl Exp $
* $Id: primnodes.h,v 1.70 2002/11/26 03:01:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -357,7 +357,7 @@ typedef struct Aggref
* 3. Finally, the planner converts the oper list to a list of normal Expr
* nodes representing the application of the operator(s) to the lefthand
* expressions and values from the inner targetlist. The inner
* targetlist items are represented by placeholder Param or Const nodes.
* targetlist items are represented by placeholder Param nodes.
* The lefthand field is set to NIL, since its expressions are now in
* the Expr list. This representation is passed to the executor.
*