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Bring SIMILAR TO and SUBSTRING into some semblance of conformance with

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the SQL99 standard.  (I'm not sure that the character-class features are
quite right, but that can be fixed later.)  Document SQL99 and POSIX
regexps as being different features; provide variants of SUBSTRING for
each.
This commit is contained in:
Tom Lane
2002-09-22 17:27:25 +00:00
parent ac355d558e
commit 9946b83ded
7 changed files with 683 additions and 381 deletions
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28
src/backend/parser/gram.y
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.367 2002/09/18 21:35:21 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.368 2002/09/22 17:27:23 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -5644,22 +5644,40 @@ a_expr: c_expr { $$ = $1; }
}
| a_expr SIMILAR TO a_expr %prec SIMILAR
{ $$ = (Node *) makeSimpleA_Expr(OP, "~", $1, $4); }
{
A_Const *c = makeNode(A_Const);
FuncCall *n = makeNode(FuncCall);
c->val.type = T_Null;
n->funcname = SystemFuncName("similar_escape");
n->args = makeList2($4, (Node *) c);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *) makeSimpleA_Expr(OP, "~", $1, (Node *) n);
}
| a_expr SIMILAR TO a_expr ESCAPE a_expr
{
FuncCall *n = makeNode(FuncCall);
n->funcname = SystemFuncName("like_escape");
n->funcname = SystemFuncName("similar_escape");
n->args = makeList2($4, $6);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *) makeSimpleA_Expr(OP, "~", $1, (Node *) n);
}
| a_expr NOT SIMILAR TO a_expr %prec SIMILAR
{ $$ = (Node *) makeSimpleA_Expr(OP, "!~", $1, $5); }
{
A_Const *c = makeNode(A_Const);
FuncCall *n = makeNode(FuncCall);
c->val.type = T_Null;
n->funcname = SystemFuncName("similar_escape");
n->args = makeList2($5, (Node *) c);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *) makeSimpleA_Expr(OP, "!~", $1, (Node *) n);
}
| a_expr NOT SIMILAR TO a_expr ESCAPE a_expr
{
FuncCall *n = makeNode(FuncCall);
n->funcname = SystemFuncName("like_escape");
n->funcname = SystemFuncName("similar_escape");
n->args = makeList2($5, $7);
n->agg_star = FALSE;
n->agg_distinct = FALSE;