database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-14 08:21:07 +03:00
Code Activity

Reimplement LIKE/ESCAPE as operators so that indexscan optimization

Browse Source 
can still work, per recent discussion on pghackers.  Correct some bugs
in ILIKE implementation.
This commit is contained in:
Tom Lane
2000-09-15 18:45:31 +00:00
parent 148f905f41
commit 8ae9ad1cb8
9 changed files with 511 additions and 514 deletions
Download Patch File Download Diff File Expand all files Collapse all files

64
src/backend/parser/gram.y
View File

@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.189 2000/09/12 21:07:01 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.190 2000/09/15 18:45:30 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -365,6 +365,7 @@ static void doNegateFloat(Value *v);
%right '='
%nonassoc '<' '>'
%nonassoc LIKE ILIKE
%nonassoc ESCAPE
%nonassoc OVERLAPS
%nonassoc BETWEEN
%nonassoc IN
@ -382,7 +383,6 @@ static void doNegateFloat(Value *v);
%left '.'
%left '[' ']'
%left TYPECAST
%left ESCAPE
%%
/*
@ -4522,76 +4522,48 @@ a_expr: c_expr
{ $$ = makeA_Expr(NOT, NULL, NULL, $2); }
| a_expr LIKE a_expr
{
FuncCall *n = makeNode(FuncCall);
n->funcname = "like";
n->args = makeList($1, $3, -1);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
}
{ $$ = makeA_Expr(OP, "~~", $1, $3); }
| a_expr LIKE a_expr ESCAPE a_expr
{
FuncCall *n = makeNode(FuncCall);
n->funcname = "like";
n->args = makeList($1, $3, $5, -1);
n->funcname = "like_escape";
n->args = makeList($3, $5, -1);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
$$ = makeA_Expr(OP, "~~", $1, (Node *) n);
}
| a_expr NOT LIKE a_expr
{
FuncCall *n = makeNode(FuncCall);
n->funcname = "notlike";
n->args = makeList($1, $4, -1);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
}
{ $$ = makeA_Expr(OP, "!~~", $1, $4); }
| a_expr NOT LIKE a_expr ESCAPE a_expr
{
FuncCall *n = makeNode(FuncCall);
n->funcname = "notlike";
n->args = makeList($1, $4, $6, -1);
n->funcname = "like_escape";
n->args = makeList($4, $6, -1);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
$$ = makeA_Expr(OP, "!~~", $1, (Node *) n);
}
| a_expr ILIKE a_expr
{
FuncCall *n = makeNode(FuncCall);
n->funcname = "ilike";
n->args = makeList($1, $3, -1);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
}
{ $$ = makeA_Expr(OP, "~~*", $1, $3); }
| a_expr ILIKE a_expr ESCAPE a_expr
{
FuncCall *n = makeNode(FuncCall);
n->funcname = "ilike";
n->args = makeList($1, $3, $5, -1);
n->funcname = "like_escape";
n->args = makeList($3, $5, -1);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
$$ = makeA_Expr(OP, "~~*", $1, (Node *) n);
}
| a_expr NOT ILIKE a_expr
{
FuncCall *n = makeNode(FuncCall);
n->funcname = "inotlike";
n->args = makeList($1, $4, -1);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
}
{ $$ = makeA_Expr(OP, "!~~*", $1, $4); }
| a_expr NOT ILIKE a_expr ESCAPE a_expr
{
FuncCall *n = makeNode(FuncCall);
n->funcname = "inotlike";
n->args = makeList($1, $4, $6, -1);
n->funcname = "like_escape";
n->args = makeList($4, $6, -1);
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
$$ = makeA_Expr(OP, "!~~*", $1, (Node *) n);
}
| a_expr ISNULL