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| author | Bruce Momjian <bruce@momjian.us> | 2009-01-07 22:54:45 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2009-01-07 22:54:45 +0000 |
| commit | ae3c07522100d3b13e04dbd5890611bfb29e8215 (patch) | |
| tree | 259002efeca197a9f4086fd528fe22984b458011 /src | |
| parent | 445ce15702f701423a0fed3defe3a43662c7cd8d (diff) | |
| download | postgresql-ae3c07522100d3b13e04dbd5890611bfb29e8215.tar.gz postgresql-ae3c07522100d3b13e04dbd5890611bfb29e8215.zip | |
Add comment about why BETWEEN uses operator strings and not opclasses,
with URL pointing to email discussion.
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/parser/gram.y | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y index 90d18c98f6f..21b74983410 100644 --- a/src/backend/parser/gram.y +++ b/src/backend/parser/gram.y @@ -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, |