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Repair some issues with column aliases and RowExpr construction in the

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presence of dropped columns.  Document the already-presumed fact that
eref aliases in relation RTEs are supposed to have entries for dropped
columns; cause the user alias structs to have such entries too, so that
there's always a one-to-one mapping to the underlying physical attnums.
Adjust expandRTE() and related code to handle the case where a column
that is part of a JOIN has been dropped.  Generalize expandRTE()'s API
so that it can be used in a couple of places that formerly rolled their
own implementation of the same logic.  Fix ruleutils.c to suppress
display of aliases for columns that were dropped since the rule was made.
This commit is contained in:
Tom Lane
2004-08-19 20:57:41 +00:00
parent 040450beef
commit bbd6eb5b95
16 changed files with 463 additions and 355 deletions
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8
src/include/nodes/primnodes.h
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@@ -10,7 +10,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.101 2004/08/17 18:47:09 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.102 2004/08/19 20:57:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -98,9 +98,9 @@ typedef struct Resdom
* specifies an alias for a range variable; the alias might also
* specify renaming of columns within the table.
*
* Note: colnames is a list of Value nodes (always strings). In an RTE's
* eref Alias, the colnames list includes dropped columns, so that the
* colname list position matches the physical attribute number.
* Note: colnames is a list of Value nodes (always strings). In Alias structs
* associated with RTEs, there may be entries corresponding to dropped
* columns; these are normally empty strings (""). See parsenodes.h for info.
*/
typedef struct Alias
{