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Allow AS to be omitted when specifying an output column name in SELECT

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(or RETURNING), but only when the output name is not any SQL keyword.
This seems as close as we can get to the standard's syntax without a
great deal of thrashing.  Original patch by Hiroshi Saito, amended by me.
This commit is contained in:
Tom Lane
2008-02-15 22:17:06 +00:00
parent cc80f0a340
commit e67867b26c
10 changed files with 119 additions and 51 deletions
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10
src/interfaces/ecpg/preproc/preproc.y
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@@ -1,4 +1,4 @@
/* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/preproc.y,v 1.360 2008/02/14 14:54:48 meskes Exp $ */
/* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/preproc.y,v 1.361 2008/02/15 22:17:06 tgl Exp $ */
/* Copyright comment */
%{
@@ -521,8 +521,9 @@ add_typedef(char *name, char * dimension, char * length, enum ECPGttype type_enu
%nonassoc OVERLAPS
%nonassoc BETWEEN
%nonassoc IN_P
%left POSTFIXOP /* dummy for postfix Op rules */
%left Op OPERATOR /* multi-character ops and user-defined operators */
%left POSTFIXOP /* dummy for postfix Op rules */
%nonassoc IDENT /* to support target_el without AS */
%left Op OPERATOR /* multi-character ops and user-defined operators */
%nonassoc NOTNULL
%nonassoc ISNULL
%nonassoc IS NULL_P TRUE_P FALSE_P UNKNOWN
@@ -4695,9 +4696,10 @@ target_list: target_list ',' target_el
{ $$ = $1; }
;
/* AS is not optional because shift/red conflict with unary ops */
target_el: a_expr AS ColLabel
{ $$ = cat_str(3, $1, make_str("as"), $3); }
| a_expr IDENT
{ $$ = cat_str(3, $1, make_str("as"), $2); }
| a_expr
{ $$ = $1; }
| '*'