Allow most expressions in BETWEEN clause. Allow all expressions if
surrounded by parentheses (but not all are meaningful). Remove unused keywords ACL, APPEND, MERGE. Requires a "make clean" to recompile all code since keyword numeric assignments have changed with keyword removal.
This commit is contained in:
Thomas G. Lockhart
parent
bced35f1e1
commit
c1dcd59c48
@ -10,7 +10,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.103 1998/02/03 19:26:41 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.104 1998/02/04 06:11:46 thomas Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -188,7 +188,7 @@ Oid param_type(int t); /* used in parse_expr.c */
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%type <node> columnDef, alter_clause
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%type <defelt> def_elem
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%type <node> def_arg, columnElem, where_clause,
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a_expr, a_expr_or_null, AexprConst,
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a_expr, a_expr_or_null, b_expr, AexprConst,
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in_expr, in_expr_nodes, not_in_expr, not_in_expr_nodes,
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having_clause
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%type <list> row_descriptor, row_list
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@ -269,14 +269,14 @@ Oid param_type(int t); /* used in parse_expr.c */
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%token TYPE_P
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/* Keywords for Postgres support (not in SQL92 reserved words) */
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%token ABORT_TRANS, ACL, AFTER, AGGREGATE, ANALYZE,
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APPEND, BACKWARD, BEFORE, BINARY, CLUSTER, COPY,
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%token ABORT_TRANS, AFTER, AGGREGATE, ANALYZE,
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BACKWARD, BEFORE, BINARY, CLUSTER, COPY,
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DATABASE, DELIMITERS, DO, EXPLAIN, EXTEND,
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FORWARD, FUNCTION, HANDLER,
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INDEX, INHERITS, INSTEAD, ISNULL,
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LANCOMPILER, LISTEN, LOAD, LOCK_P, LOCATION, MERGE, MOVE,
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LANCOMPILER, LISTEN, LOAD, LOCK_P, LOCATION, MOVE,
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NEW, NONE, NOTHING, NOTNULL, OIDS, OPERATOR, PROCEDURAL,
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RECIPE, RENAME, REPLACE, RESET, RETURNS, RULE,
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RECIPE, RENAME, RESET, RETURNS, RULE,
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SEQUENCE, SETOF, SHOW, STDIN, STDOUT, TRUSTED,
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VACUUM, VERBOSE, VERSION
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@ -3199,6 +3199,14 @@ row_list: row_list ',' a_expr
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}
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;
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/*
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* This is the heart of the expression syntax.
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* Note that the BETWEEN clause looks similar to a boolean expression
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* and so we must define b_expr which is almost the same as a_expr
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* but without the boolean expressions.
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* All operations are allowed in a BETWEEN clause if surrounded by parens.
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*/
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a_expr: attr opt_indirection
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{
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$1->indirection = $2;
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@ -3208,6 +3216,14 @@ a_expr: attr opt_indirection
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{ $$ = $1; }
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| AexprConst
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{ $$ = $1; }
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| ColId
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{
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/* could be a column name or a relation_name */
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Ident *n = makeNode(Ident);
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n->name = $1;
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n->indirection = NULL;
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$$ = (Node *)n;
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}
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| '-' a_expr %prec UMINUS
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{ $$ = makeA_Expr(OP, "-", NULL, $2); }
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| a_expr '+' a_expr
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@ -3274,14 +3290,6 @@ a_expr: attr opt_indirection
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{ $$ = makeA_Expr(OP, $1, NULL, $2); }
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| a_expr Op
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{ $$ = makeA_Expr(OP, $2, $1, NULL); }
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| ColId
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{
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/* could be a column name or a relation_name */
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Ident *n = makeNode(Ident);
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n->name = $1;
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n->indirection = NULL;
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$$ = (Node *)n;
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}
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| name '(' '*' ')'
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{
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/* cheap hack for aggregate (eg. count) */
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@ -3508,13 +3516,13 @@ a_expr: attr opt_indirection
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n->typename->name = xlateSqlType("bool");
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$$ = makeA_Expr(OP, "=", $1,(Node *)n);
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}
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| a_expr BETWEEN AexprConst AND AexprConst
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| a_expr BETWEEN b_expr AND b_expr
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{
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$$ = makeA_Expr(AND, NULL,
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makeA_Expr(OP, ">=", $1, $3),
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makeA_Expr(OP, "<=", $1, $5));
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}
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| a_expr NOT BETWEEN AexprConst AND AexprConst
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| a_expr NOT BETWEEN b_expr AND b_expr
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{
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$$ = makeA_Expr(OR, NULL,
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makeA_Expr(OP, "<", $1, $4),
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@ -3796,6 +3804,233 @@ a_expr: attr opt_indirection
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{ $$ = makeA_Expr(NOT, NULL, NULL, $2); }
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;
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/*
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* b_expr is a subset of the complete expression syntax
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* defined by a_expr. b_expr is used in BETWEEN clauses
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* to eliminate parser ambiguities stemming from the AND keyword.
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*/
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b_expr: attr opt_indirection
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{
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$1->indirection = $2;
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$$ = (Node *)$1;
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}
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| AexprConst
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{ $$ = $1; }
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| ColId
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{
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/* could be a column name or a relation_name */
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Ident *n = makeNode(Ident);
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n->name = $1;
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n->indirection = NULL;
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$$ = (Node *)n;
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}
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| '-' b_expr %prec UMINUS
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{ $$ = makeA_Expr(OP, "-", NULL, $2); }
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| b_expr '+' b_expr
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{ $$ = makeA_Expr(OP, "+", $1, $3); }
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| b_expr '-' b_expr
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{ $$ = makeA_Expr(OP, "-", $1, $3); }
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| b_expr '/' b_expr
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{ $$ = makeA_Expr(OP, "/", $1, $3); }
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| b_expr '*' b_expr
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{ $$ = makeA_Expr(OP, "*", $1, $3); }
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| ':' b_expr
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{ $$ = makeA_Expr(OP, ":", NULL, $2); }
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| ';' b_expr
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{ $$ = makeA_Expr(OP, ";", NULL, $2); }
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| '|' b_expr
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{ $$ = makeA_Expr(OP, "|", NULL, $2); }
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| b_expr TYPECAST Typename
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{
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$$ = (Node *)$1;
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/* AexprConst can be either A_Const or ParamNo */
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if (nodeTag($1) == T_A_Const) {
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((A_Const *)$1)->typename = $3;
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} else if (nodeTag($1) == T_Param) {
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((ParamNo *)$1)->typename = $3;
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/* otherwise, try to transform to a function call */
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} else {
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FuncCall *n = makeNode(FuncCall);
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n->funcname = $3->name;
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n->args = lcons($1,NIL);
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$$ = (Node *)n;
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}
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}
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| CAST b_expr AS Typename
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{
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$$ = (Node *)$2;
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/* AexprConst can be either A_Const or ParamNo */
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if (nodeTag($2) == T_A_Const) {
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((A_Const *)$2)->typename = $4;
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} else if (nodeTag($2) == T_Param) {
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((ParamNo *)$2)->typename = $4;
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/* otherwise, try to transform to a function call */
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} else {
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FuncCall *n = makeNode(FuncCall);
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n->funcname = $4->name;
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n->args = lcons($2,NIL);
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$$ = (Node *)n;
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}
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}
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| '(' a_expr ')'
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{ $$ = $2; }
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| b_expr Op b_expr
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{ $$ = makeIndexable($2,$1,$3); }
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| Op b_expr
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{ $$ = makeA_Expr(OP, $1, NULL, $2); }
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| b_expr Op
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{ $$ = makeA_Expr(OP, $2, $1, NULL); }
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| name '(' ')'
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = $1;
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n->args = NIL;
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$$ = (Node *)n;
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}
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| name '(' expr_list ')'
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = $1;
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n->args = $3;
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$$ = (Node *)n;
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}
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| CURRENT_DATE
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{
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A_Const *n = makeNode(A_Const);
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TypeName *t = makeNode(TypeName);
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n->val.type = T_String;
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n->val.val.str = "now";
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n->typename = t;
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t->name = xlateSqlType("date");
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t->setof = FALSE;
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$$ = (Node *)n;
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}
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| CURRENT_TIME
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{
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A_Const *n = makeNode(A_Const);
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TypeName *t = makeNode(TypeName);
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n->val.type = T_String;
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n->val.val.str = "now";
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n->typename = t;
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t->name = xlateSqlType("time");
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t->setof = FALSE;
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$$ = (Node *)n;
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}
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| CURRENT_TIME '(' Iconst ')'
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{
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FuncCall *n = makeNode(FuncCall);
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A_Const *s = makeNode(A_Const);
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TypeName *t = makeNode(TypeName);
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n->funcname = xlateSqlType("time");
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n->args = lcons(s, NIL);
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s->val.type = T_String;
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s->val.val.str = "now";
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s->typename = t;
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t->name = xlateSqlType("time");
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t->setof = FALSE;
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if ($3 != 0)
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elog(NOTICE,"CURRENT_TIME(%d) precision not implemented; zero used instead",$3);
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$$ = (Node *)n;
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}
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| CURRENT_TIMESTAMP
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{
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A_Const *n = makeNode(A_Const);
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TypeName *t = makeNode(TypeName);
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n->val.type = T_String;
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n->val.val.str = "now";
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n->typename = t;
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t->name = xlateSqlType("timestamp");
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t->setof = FALSE;
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$$ = (Node *)n;
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}
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| CURRENT_TIMESTAMP '(' Iconst ')'
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{
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FuncCall *n = makeNode(FuncCall);
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A_Const *s = makeNode(A_Const);
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TypeName *t = makeNode(TypeName);
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n->funcname = xlateSqlType("timestamp");
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n->args = lcons(s, NIL);
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s->val.type = T_String;
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s->val.val.str = "now";
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s->typename = t;
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t->name = xlateSqlType("timestamp");
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t->setof = FALSE;
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if ($3 != 0)
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elog(NOTICE,"CURRENT_TIMESTAMP(%d) precision not implemented; zero used instead",$3);
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$$ = (Node *)n;
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}
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| CURRENT_USER
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = "getpgusername";
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n->args = NIL;
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$$ = (Node *)n;
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}
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| POSITION '(' position_list ')'
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = "strpos";
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n->args = $3;
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$$ = (Node *)n;
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}
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| SUBSTRING '(' substr_list ')'
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = "substr";
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n->args = $3;
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$$ = (Node *)n;
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}
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/* various trim expressions are defined in SQL92 - thomas 1997-07-19 */
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| TRIM '(' BOTH trim_list ')'
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = "btrim";
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n->args = $4;
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$$ = (Node *)n;
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}
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| TRIM '(' LEADING trim_list ')'
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = "ltrim";
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n->args = $4;
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$$ = (Node *)n;
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}
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| TRIM '(' TRAILING trim_list ')'
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = "rtrim";
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n->args = $4;
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$$ = (Node *)n;
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}
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| TRIM '(' trim_list ')'
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = "btrim";
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n->args = $3;
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$$ = (Node *)n;
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}
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;
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opt_indirection: '[' a_expr ']' opt_indirection
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{
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A_Indices *ai = makeNode(A_Indices);
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.33 1998/02/03 16:04:05 thomas Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.34 1998/02/04 06:11:48 thomas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -30,7 +30,6 @@
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static ScanKeyword ScanKeywords[] = {
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/* name value */
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{"abort", ABORT_TRANS},
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{"acl", ACL},
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{"action", ACTION},
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{"add", ADD},
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{"after", AFTER},
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@ -40,7 +39,6 @@ static ScanKeyword ScanKeywords[] = {
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{"analyze", ANALYZE},
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{"and", AND},
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{"any", ANY},
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{"append", APPEND},
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{"archive", ARCHIVE},
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{"as", AS},
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{"asc", ASC},
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@ -128,7 +126,6 @@ static ScanKeyword ScanKeywords[] = {
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{"location", LOCATION},
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{"lock", LOCK_P},
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{"match", MATCH},
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{"merge", MERGE},
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{"minute", MINUTE_P},
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{"month", MONTH_P},
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{"move", MOVE},
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@ -165,7 +162,6 @@ static ScanKeyword ScanKeywords[] = {
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{"recipe", RECIPE},
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{"references", REFERENCES},
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{"rename", RENAME},
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{"replace", REPLACE},
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{"reset", RESET},
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{"returns", RETURNS},
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{"revoke", REVOKE},
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