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Add comment about why BETWEEN uses operator strings and not opclasses,

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This commit is contained in:
Bruce Momjian
2009-01-07 22:54:45 +00:00
parent 445ce15702
commit ae3c075221
1 changed files with 6 additions and 1 deletions
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7
src/backend/parser/gram.y
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.651 2009/01/01 17:23:45 momjian Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.652 2009/01/07 22:54:45 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -8361,6 +8361,11 @@ a_expr: c_expr { $$ = $1; }
{
$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "<>", $1, (Node *) $6, @2);
}
/*
* Ideally we would not use hard-wired operators below but instead use
* opclasses. However, mixed data types and other issues make this
* difficult: http://archives.postgresql.org/pgsql-hackers/2008-08/msg01142.php
*/
| a_expr BETWEEN opt_asymmetric b_expr AND b_expr %prec BETWEEN
{
$$ = (Node *) makeA_Expr(AEXPR_AND, NIL,