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@ -10,7 +10,7 @@ |
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* |
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* |
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* |
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* |
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* IDENTIFICATION |
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* IDENTIFICATION |
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.37 1998/10/14 15:56:43 thomas Exp $ |
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.38 1998/12/04 15:34:29 thomas Exp $ |
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* |
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* |
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* HISTORY |
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* HISTORY |
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* AUTHOR DATE MAJOR EVENT |
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* AUTHOR DATE MAJOR EVENT |
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@ -208,6 +208,8 @@ Oid param_type(int t); /* used in parse_expr.c */ |
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%type <list> row_descriptor, row_list, c_list, c_expr |
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%type <list> row_descriptor, row_list, c_list, c_expr |
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%type <node> row_expr |
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%type <node> row_expr |
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%type <str> row_op |
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%type <str> row_op |
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%type <node> case_expr, case_arg, when_clause, case_default |
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%type <list> when_clause_list |
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%type <ival> sub_type |
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%type <ival> sub_type |
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%type <list> OptCreateAs, CreateAsList |
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%type <list> OptCreateAs, CreateAsList |
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%type <node> CreateAsElement |
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%type <node> CreateAsElement |
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@ -259,26 +261,27 @@ Oid param_type(int t); /* used in parse_expr.c */ |
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/* Keywords (in SQL92 reserved words) */ |
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/* Keywords (in SQL92 reserved words) */ |
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%token ABSOLUTE, ACTION, ADD, ALL, ALTER, AND, ANY, AS, ASC, |
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%token ABSOLUTE, ACTION, ADD, ALL, ALTER, AND, ANY, AS, ASC, |
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BEGIN_TRANS, BETWEEN, BOTH, BY, |
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BEGIN_TRANS, BETWEEN, BOTH, BY, |
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CASCADE, CAST, CHAR, CHARACTER, CHECK, CLOSE, COLLATE, COLUMN, COMMIT, |
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CASCADE, CASE, CAST, CHAR, CHARACTER, CHECK, CLOSE, |
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COALESCE, COLLATE, COLUMN, COMMIT, |
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CONSTRAINT, CREATE, CROSS, CURRENT, CURRENT_DATE, CURRENT_TIME, |
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CONSTRAINT, CREATE, CROSS, CURRENT, CURRENT_DATE, CURRENT_TIME, |
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CURRENT_TIMESTAMP, CURRENT_USER, CURSOR, |
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CURRENT_TIMESTAMP, CURRENT_USER, CURSOR, |
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DAY_P, DECIMAL, DECLARE, DEFAULT, DELETE, DESC, DISTINCT, DOUBLE, DROP, |
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DAY_P, DECIMAL, DECLARE, DEFAULT, DELETE, DESC, DISTINCT, DOUBLE, DROP, |
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END_TRANS, EXECUTE, EXISTS, EXTRACT, |
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ELSE, END_TRANS, EXECUTE, EXISTS, EXTRACT, |
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FALSE_P, FETCH, FLOAT, FOR, FOREIGN, FROM, FULL, |
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FALSE_P, FETCH, FLOAT, FOR, FOREIGN, FROM, FULL, |
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GRANT, GROUP, HAVING, HOUR_P, |
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GRANT, GROUP, HAVING, HOUR_P, |
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IN, INNER_P, INSENSITIVE, INSERT, INTERVAL, INTO, IS, |
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IN, INNER_P, INSENSITIVE, INSERT, INTERVAL, INTO, IS, |
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JOIN, KEY, LANGUAGE, LEADING, LEFT, LIKE, LOCAL, |
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JOIN, KEY, LANGUAGE, LEADING, LEFT, LIKE, LOCAL, |
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MATCH, MINUTE_P, MONTH_P, NAMES, |
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MATCH, MINUTE_P, MONTH_P, NAMES, |
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NATIONAL, NATURAL, NCHAR, NEXT, NO, NOT, NULL_P, NUMERIC, |
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NATIONAL, NATURAL, NCHAR, NEXT, NO, NOT, NULLIF, NULL_P, NUMERIC, |
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OF, ON, ONLY, OPTION, OR, ORDER, OUTER_P, |
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OF, ON, ONLY, OPTION, OR, ORDER, OUTER_P, |
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PARTIAL, POSITION, PRECISION, PRIMARY, PRIOR, PRIVILEGES, PROCEDURE, PUBLIC, |
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PARTIAL, POSITION, PRECISION, PRIMARY, PRIOR, PRIVILEGES, PROCEDURE, PUBLIC, |
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READ, REFERENCES, RELATIVE, REVOKE, RIGHT, ROLLBACK, |
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READ, REFERENCES, RELATIVE, REVOKE, RIGHT, ROLLBACK, |
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SCROLL, SECOND_P, SELECT, SET, SUBSTRING, |
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SCROLL, SECOND_P, SELECT, SET, SUBSTRING, |
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TABLE, TIME, TIMESTAMP, TIMEZONE_HOUR, TIMEZONE_MINUTE, |
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TABLE, THEN, TIME, TIMESTAMP, TIMEZONE_HOUR, TIMEZONE_MINUTE, |
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TO, TRAILING, TRANSACTION, TRIM, TRUE_P, |
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TO, TRAILING, TRANSACTION, TRIM, TRUE_P, |
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UNION, UNIQUE, UPDATE, USER, USING, |
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UNION, UNIQUE, UPDATE, USER, USING, |
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VALUES, VARCHAR, VARYING, VIEW, |
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VALUES, VARCHAR, VARYING, VIEW, |
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WHERE, WITH, WORK, YEAR_P, ZONE |
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WHEN, WHERE, WITH, WORK, YEAR_P, ZONE |
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/* Keywords (in SQL3 reserved words) */ |
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/* Keywords (in SQL3 reserved words) */ |
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%token TRIGGER |
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%token TRIGGER |
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@ -3276,14 +3279,14 @@ sub_type: ANY { $$ = ANY_SUBLINK; } |
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| ALL { $$ = ALL_SUBLINK; } |
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| ALL { $$ = ALL_SUBLINK; } |
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; |
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; |
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/* |
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/* General expressions |
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* This is the heart of the expression syntax. |
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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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* 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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* 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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* 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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* All operations/expressions are allowed in a BETWEEN clause |
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* if surrounded by parens. |
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*/ |
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*/ |
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a_expr: attr opt_indirection |
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a_expr: attr opt_indirection |
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{ |
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{ |
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$1->indirection = $2; |
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$1->indirection = $2; |
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@ -3895,14 +3898,15 @@ a_expr: attr opt_indirection |
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{ $$ = makeA_Expr(OR, NULL, $1, $3); } |
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{ $$ = makeA_Expr(OR, NULL, $1, $3); } |
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| NOT a_expr |
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| NOT a_expr |
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{ $$ = makeA_Expr(NOT, NULL, NULL, $2); } |
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{ $$ = makeA_Expr(NOT, NULL, NULL, $2); } |
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| case_expr |
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{ $$ = $1; } |
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; |
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; |
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/* |
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/* Restricted expressions |
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* b_expr is a subset of the complete expression syntax |
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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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* 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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* to eliminate parser ambiguities stemming from the AND keyword. |
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*/ |
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*/ |
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b_expr: attr opt_indirection |
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b_expr: attr opt_indirection |
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{ |
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{ |
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$1->indirection = $2; |
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$1->indirection = $2; |
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@ -4379,6 +4383,94 @@ not_in_expr_nodes: AexprConst |
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} |
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} |
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; |
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; |
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/* Case clause |
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* Define SQL92-style case clause. |
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* Allow all four forms described in the standard: |
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* - Full specification |
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* CASE WHEN a = b THEN c ... ELSE d END |
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* - Implicit argument |
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* CASE a WHEN b THEN c ... ELSE d END |
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* - Conditional NULL |
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* NULLIF(x,y) |
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* same as CASE WHEN x = y THEN NULL ELSE x END |
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* - Conditional substitution from list, use first non-null argument |
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* COALESCE(a,b,...) |
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* same as CASE WHEN a IS NOT NULL THEN a WHEN b IS NOT NULL THEN b ... END |
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* - thomas 1998-11-09 |
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*/ |
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case_expr: CASE case_arg when_clause_list case_default END_TRANS |
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{ |
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CaseExpr *c = makeNode(CaseExpr); |
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c->arg = $2; |
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c->args = $3; |
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c->defresult = $4; |
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$$ = (Node *)c; |
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} |
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| NULLIF '(' a_expr ',' a_expr ')' |
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{ |
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CaseExpr *c = makeNode(CaseExpr); |
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CaseWhen *w = makeNode(CaseWhen); |
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c->args = lcons(w, NIL); |
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c->defresult = $3; |
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w->expr = makeA_Expr(OP, "=", $3, $5); |
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$$ = (Node *)c; |
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elog(NOTICE,"NULLIF() not yet fully implemented"); |
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} |
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| COALESCE '(' expr_list ')' |
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{ |
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CaseExpr *c = makeNode(CaseExpr); |
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CaseWhen *w; |
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List *l; |
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foreach (l,$3) |
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{ |
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w = makeNode(CaseWhen); |
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w->expr = makeA_Expr(NOTNULL, NULL, lfirst(l), NULL); |
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w->result = lfirst(l); |
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c->args = lappend(c->args, w); |
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} |
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$$ = (Node *)c; |
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elog(NOTICE,"COALESCE() not yet fully implemented"); |
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} |
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; |
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when_clause_list: when_clause_list when_clause |
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{ $$ = lappend($1, $2); } |
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| when_clause |
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{ $$ = lcons($1, NIL); } |
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; |
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when_clause: WHEN a_expr THEN a_expr_or_null |
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{ |
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CaseWhen *w = makeNode(CaseWhen); |
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w->expr = $2; |
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w->result = $4; |
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$$ = (Node *)w; |
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} |
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; |
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case_default: ELSE a_expr_or_null { $$ = $2; } |
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| /*EMPTY*/ { $$ = NULL; } |
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; |
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case_arg: attr opt_indirection |
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{ |
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$1->indirection = $2; |
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$$ = (Node *)$1; |
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} |
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| ColId |
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{ |
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/* could be a column name or a relation_name */ |
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Ident *n = makeNode(Ident); |
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n->name = $1; |
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n->indirection = NULL; |
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$$ = (Node *)n; |
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} |
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| /*EMPTY*/ |
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{ $$ = NULL; } |
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; |
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attr: relation_name '.' attrs |
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attr: relation_name '.' attrs |
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{ |
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{ |
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$$ = makeNode(Attr); |
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$$ = makeNode(Attr); |
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@ -4723,12 +4815,16 @@ ColLabel: ColId { $$ = $1; } |
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| ABORT_TRANS { $$ = "abort"; } |
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| ABORT_TRANS { $$ = "abort"; } |
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| ANALYZE { $$ = "analyze"; } |
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| ANALYZE { $$ = "analyze"; } |
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| BINARY { $$ = "binary"; } |
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| BINARY { $$ = "binary"; } |
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| CASE { $$ = "case"; } |
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| CLUSTER { $$ = "cluster"; } |
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| CLUSTER { $$ = "cluster"; } |
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| COALESCE { $$ = "coalesce"; } |
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| CONSTRAINT { $$ = "constraint"; } |
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| CONSTRAINT { $$ = "constraint"; } |
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| COPY { $$ = "copy"; } |
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| COPY { $$ = "copy"; } |
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| CROSS { $$ = "cross"; } |
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| CROSS { $$ = "cross"; } |
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| CURRENT { $$ = "current"; } |
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| CURRENT { $$ = "current"; } |
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| DO { $$ = "do"; } |
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| DO { $$ = "do"; } |
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| ELSE { $$ = "else"; } |
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| END_TRANS { $$ = "end"; } |
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| EXPLAIN { $$ = "explain"; } |
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| EXPLAIN { $$ = "explain"; } |
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| EXTEND { $$ = "extend"; } |
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| EXTEND { $$ = "extend"; } |
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| FALSE_P { $$ = "false"; } |
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| FALSE_P { $$ = "false"; } |
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@ -4740,6 +4836,7 @@ ColLabel: ColId { $$ = $1; } |
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| MOVE { $$ = "move"; } |
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| MOVE { $$ = "move"; } |
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| NEW { $$ = "new"; } |
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| NEW { $$ = "new"; } |
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| NONE { $$ = "none"; } |
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| NONE { $$ = "none"; } |
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| NULLIF { $$ = "nullif"; } |
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| ORDER { $$ = "order"; } |
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| ORDER { $$ = "order"; } |
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| POSITION { $$ = "position"; } |
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| POSITION { $$ = "position"; } |
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| PRECISION { $$ = "precision"; } |
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| PRECISION { $$ = "precision"; } |
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@ -4747,10 +4844,12 @@ ColLabel: ColId { $$ = $1; } |
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| SETOF { $$ = "setof"; } |
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| SETOF { $$ = "setof"; } |
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| SHOW { $$ = "show"; } |
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| SHOW { $$ = "show"; } |
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| TABLE { $$ = "table"; } |
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| TABLE { $$ = "table"; } |
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| THEN { $$ = "then"; } |
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| TRANSACTION { $$ = "transaction"; } |
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| TRANSACTION { $$ = "transaction"; } |
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| TRUE_P { $$ = "true"; } |
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| TRUE_P { $$ = "true"; } |
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| VACUUM { $$ = "vacuum"; } |
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| VACUUM { $$ = "vacuum"; } |
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| VERBOSE { $$ = "verbose"; } |
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| VERBOSE { $$ = "verbose"; } |
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| WHEN { $$ = "when"; } |
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; |
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; |
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SpecialRuleRelation: CURRENT |
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SpecialRuleRelation: CURRENT |
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Thomas G. Lockhart
27 years ago