Modify the outer join placeholder code with something closer to working
code. Works here, but not completely implemented past this point.
This commit is contained in:
Thomas G. Lockhart
parent
8f0a76f012
commit
03d5c070f0
@ -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 2.56 1999/02/21 03:49:00 scrappy Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.57 1999/02/23 07:42:41 thomas Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -107,7 +107,7 @@ Oid param_type(int t); /* used in parse_expr.c */
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DefElem *defelt;
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ParamString *param;
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SortGroupBy *sortgroupby;
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JoinUsing *joinusing;
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JoinExpr *joinexpr;
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IndexElem *ielem;
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RangeVar *range;
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RelExpr *relexp;
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@ -131,7 +131,7 @@ Oid param_type(int t); /* used in parse_expr.c */
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RemoveFuncStmt, RemoveStmt,
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RenameStmt, RevokeStmt, RuleStmt, TransactionStmt, ViewStmt, LoadStmt,
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CreatedbStmt, DestroydbStmt, VacuumStmt, CursorStmt, SubSelect,
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UpdateStmt, InsertStmt, select_w_o_sort, SelectStmt, NotifyStmt, DeleteStmt,
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UpdateStmt, InsertStmt, select_clause, SelectStmt, NotifyStmt, DeleteStmt,
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ClusterStmt, ExplainStmt, VariableSetStmt, VariableShowStmt, VariableResetStmt,
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CreateUserStmt, AlterUserStmt, DropUserStmt, RuleActionStmt
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@ -144,7 +144,6 @@ Oid param_type(int t); /* used in parse_expr.c */
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%type <str> user_valid_clause
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%type <list> user_group_list, user_group_clause
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%type <str> join_expr, join_outer, join_spec
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%type <boolean> TriggerActionTime, TriggerForSpec, PLangTrusted
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%type <str> TriggerEvents, TriggerFuncArg
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@ -167,7 +166,7 @@ Oid param_type(int t); /* used in parse_expr.c */
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oper_argtypes, RuleActionList, RuleActionBlock, RuleActionMulti,
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opt_column_list, columnList, opt_va_list, va_list,
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sort_clause, sortby_list, index_params, index_list, name_list,
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from_clause, from_list, opt_array_bounds, nest_array_bounds,
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from_clause, from_expr, table_list, opt_array_bounds, nest_array_bounds,
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expr_list, attrs, res_target_list, res_target_list2,
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def_list, opt_indirection, group_clause, TriggerFuncArgs,
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opt_select_limit
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@ -177,14 +176,16 @@ Oid param_type(int t); /* used in parse_expr.c */
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%type <boolean> TriggerForOpt, TriggerForType, OptTemp
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%type <list> for_update_clause
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%type <list> join_list
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%type <joinusing>
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join_using
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%type <list> for_update_clause, update_list
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%type <boolean> opt_union
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%type <boolean> opt_table
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%type <boolean> opt_trans
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%type <list> join_clause_with_union, join_clause, join_list, join_qual, using_list
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%type <node> join_expr, using_expr
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%type <str> join_outer
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%type <ival> join_type
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%type <node> position_expr
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%type <list> extract_list, position_list
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%type <list> substr_list, substr_from, substr_for, trim_list
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@ -226,7 +227,7 @@ Oid param_type(int t); /* used in parse_expr.c */
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%type <attr> event_object, attr
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%type <sortgroupby> sortby
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%type <ielem> index_elem, func_index
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%type <range> from_val
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%type <range> table_expr
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%type <relexp> relation_expr
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%type <target> res_target_el, res_target_el2
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%type <paramno> ParamNo
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@ -858,20 +859,15 @@ ColConstraint:
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{ $$ = $1; }
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;
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/* The column constraint WITH NULL gives a shift/reduce error
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* because it requires yacc to look more than one token ahead to
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* resolve WITH TIME ZONE and WITH NULL.
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* So, leave it out of the syntax for now.
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| WITH NULL_P
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{
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$$ = NULL;
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}
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* - thomas 1998-09-12
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*
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* DEFAULT NULL is already the default for Postgres.
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/* DEFAULT NULL is already the default for Postgres.
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* Bue define it here and carry it forward into the system
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* to make it explicit.
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* - thomas 1998-09-13
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* WITH NULL and NULL are not SQL92-standard syntax elements,
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* so leave them out. Use DEFAULT NULL to explicitly indicate
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* that a column may have that value. WITH NULL leads to
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* shift/reduce conflicts with WITH TIME ZONE anyway.
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* - thomas 1999-01-08
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*/
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ColConstraintElem: CHECK '(' constraint_expr ')'
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{
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@ -2735,8 +2731,10 @@ opt_of: OF columnList
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* accepts the use of '(' and ')' to select an order of set operations.
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*
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* The rule returns a SelectStmt Node having the set operations attached to
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* unionClause and intersectClause (NIL if no set operations were present) */
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SelectStmt: select_w_o_sort sort_clause for_update_clause opt_select_limit
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* unionClause and intersectClause (NIL if no set operations were present)
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*/
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SelectStmt: select_clause sort_clause for_update_clause opt_select_limit
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{
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/* There were no set operations, so just attach the sortClause */
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if IsA($1, SelectStmt)
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@ -2827,7 +2825,7 @@ SelectStmt: select_w_o_sort sort_clause for_update_clause opt_select_limit
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* the A_Expr Nodes.
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* If no set operations show up in the query the tree consists only of one
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* SelectStmt Node */
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select_w_o_sort: '(' select_w_o_sort ')'
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select_clause: '(' select_clause ')'
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{
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$$ = $2;
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}
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@ -2835,12 +2833,12 @@ select_w_o_sort: '(' select_w_o_sort ')'
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{
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$$ = $1;
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}
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| select_w_o_sort EXCEPT select_w_o_sort
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| select_clause EXCEPT select_clause
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{
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$$ = (Node *)makeA_Expr(AND,NULL,$1,
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makeA_Expr(NOT,NULL,NULL,$3));
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}
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| select_w_o_sort UNION opt_union select_w_o_sort
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| select_clause UNION opt_union select_clause
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{
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if (IsA($4, SelectStmt))
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{
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@ -2849,7 +2847,7 @@ select_w_o_sort: '(' select_w_o_sort ')'
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}
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$$ = (Node *)makeA_Expr(OR,NULL,$1,$4);
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}
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| select_w_o_sort INTERSECT select_w_o_sort
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| select_clause INTERSECT select_clause
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{
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$$ = (Node *)makeA_Expr(AND,NULL,$1,$3);
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}
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@ -3024,7 +3022,7 @@ name_list: name
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{ $$ = lappend($1,makeString($3)); }
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;
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group_clause: GROUP BY expr_list { $$ = $3; }
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group_clause: GROUP BY expr_list { $$ = $3; }
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| /*EMPTY*/ { $$ = NIL; }
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;
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@ -3035,19 +3033,12 @@ having_clause: HAVING a_expr
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| /*EMPTY*/ { $$ = NULL; }
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;
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for_update_clause:
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FOR UPDATE
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{
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$$ = lcons(NULL, NULL);
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}
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| FOR UPDATE OF va_list
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{
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$$ = $4;
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}
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| /* EMPTY */
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{
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$$ = NULL;
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}
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for_update_clause: FOR UPDATE update_list { $$ = $3; }
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| /* EMPTY */ { $$ = NULL; }
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;
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update_list: OF va_list { $$ = $2; }
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| /* EMPTY */ { $$ = lcons(NULL, NULL); }
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;
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/*****************************************************************************
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@ -3058,24 +3049,25 @@ for_update_clause:
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*
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*****************************************************************************/
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from_clause: FROM '(' relation_expr join_expr JOIN relation_expr join_spec ')'
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{
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$$ = NIL;
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elog(ERROR,"JOIN not yet implemented");
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}
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| FROM from_list { $$ = $2; }
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from_clause: FROM from_expr { $$ = $2; }
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| /*EMPTY*/ { $$ = NIL; }
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;
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from_list: from_list ',' from_val
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from_expr: '(' join_clause_with_union ')'
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{ $$ = $2; }
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| join_clause
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{ $$ = $1; }
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| table_list
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{ $$ = $1; }
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;
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table_list: table_list ',' table_expr
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{ $$ = lappend($1, $3); }
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| from_val CROSS JOIN from_val
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{ elog(ERROR,"CROSS JOIN not yet implemented"); }
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| from_val
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| table_expr
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{ $$ = lcons($1, NIL); }
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;
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from_val: relation_expr AS ColLabel
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table_expr: relation_expr AS ColLabel
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{
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$$ = makeNode(RangeVar);
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$$->relExpr = $1;
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@ -3095,64 +3087,130 @@ from_val: relation_expr AS ColLabel
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}
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;
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join_expr: NATURAL join_expr { $$ = NULL; }
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| FULL join_outer
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{ elog(ERROR,"FULL OUTER JOIN not yet implemented"); }
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/* A UNION JOIN is the same as a FULL OUTER JOIN which *omits*
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* all result rows which would have matched on an INNER JOIN.
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* Let's reject this for now. - thomas 1999-01-08
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*/
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join_clause_with_union: join_clause
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{ $$ = $1; }
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| table_expr UNION JOIN table_expr
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{ elog(ERROR,"UNION JOIN not yet implemented"); }
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;
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join_clause: table_expr join_list
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{
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Node *n = lfirst($2);
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/* JoinExpr came back? then it is a join of some sort...
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*/
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if (IsA(n, JoinExpr))
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{
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JoinExpr *j = (JoinExpr *)n;
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j->larg = $1;
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$$ = $2;
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}
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/* otherwise, it was a cross join,
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* which we just represent as an inner join...
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*/
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else
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$$ = lcons($1, $2);
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}
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;
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join_list: join_list join_expr
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{
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$$ = lappend($1, $2);
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}
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| join_expr
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{
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$$ = lcons($1, NIL);
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}
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;
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/* This is everything but the left side of a join.
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* Note that a CROSS JOIN is the same as an unqualified
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* inner join, so just pass back the right-side table.
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* A NATURAL JOIN implicitly matches column names between
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* tables, so we'll collect those during the later transformation.
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*/
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join_expr: join_type JOIN table_expr join_qual
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{
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JoinExpr *n = makeNode(JoinExpr);
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n->jointype = $1;
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n->rarg = (Node *)$3;
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n->quals = $4;
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$$ = (Node *)n;
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}
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| NATURAL join_type JOIN table_expr
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{
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JoinExpr *n = makeNode(JoinExpr);
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n->jointype = $2;
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n->rarg = (Node *)$4;
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n->quals = NULL; /* figure out which columns later... */
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$$ = (Node *)n;
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}
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| CROSS JOIN table_expr
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{ $$ = (Node *)$3; }
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;
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/* OUTER is just noise... */
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join_type: FULL join_outer
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{
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$$ = FULL;
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elog(NOTICE,"FULL OUTER JOIN not yet implemented");
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}
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| LEFT join_outer
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{ elog(ERROR,"LEFT OUTER JOIN not yet implemented"); }
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{
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$$ = LEFT;
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elog(NOTICE,"LEFT OUTER JOIN not yet implemented");
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}
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| RIGHT join_outer
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{ elog(ERROR,"RIGHT OUTER JOIN not yet implemented"); }
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{
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$$ = RIGHT;
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elog(NOTICE,"RIGHT OUTER JOIN not yet implemented");
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}
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| OUTER_P
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{ elog(ERROR,"OUTER JOIN not yet implemented"); }
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{
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$$ = LEFT;
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elog(NOTICE,"OUTER JOIN not yet implemented");
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}
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| INNER_P
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{ elog(ERROR,"INNER JOIN not yet implemented"); }
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| UNION
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{ elog(ERROR,"UNION JOIN not yet implemented"); }
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{
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$$ = INNER_P;
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}
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| /*EMPTY*/
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{ elog(ERROR,"INNER JOIN not yet implemented"); }
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{
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$$ = INNER_P;
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}
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;
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join_outer: OUTER_P { $$ = NULL; }
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| /*EMPTY*/ { $$ = NULL; /* no qualifiers */ }
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;
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join_spec: ON '(' a_expr ')' { $$ = NULL; }
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| USING '(' join_list ')' { $$ = NULL; }
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| /*EMPTY*/ { $$ = NULL; /* no qualifiers */ }
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/* JOIN qualification clauses
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* Possibilities are:
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* USING ( column list ) allows only unqualified column names,
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* which must match between tables.
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* ON expr allows more general qualifications.
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* - thomas 1999-01-07
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*/
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join_qual: USING '(' using_list ')' { $$ = $3; }
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| ON a_expr { $$ = lcons($2, NIL); }
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;
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join_list: join_using { $$ = lcons($1, NIL); }
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| join_list ',' join_using { $$ = lappend($1, $3); }
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using_list: using_list ',' using_expr { $$ = lappend($1, $3); }
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| using_expr { $$ = lcons($1, NIL); }
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;
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join_using: ColId
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/* Changed from SortGroupBy parse node to new JoinUsing node.
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* SortGroupBy no longer needs these structure members.
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*
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* Once, acknowledged, this comment can be removed by the
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* developer(s) working on the JOIN clause.
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*
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* - daveh@insightdist.com 1998-07-31
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*/
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using_expr: ColId
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{
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$$ = makeNode(JoinUsing);
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$$->resno = 0;
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$$->range = NULL;
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$$->name = $1;
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}
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| ColId '.' ColId
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{
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$$ = makeNode(JoinUsing);
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$$->resno = 0;
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$$->range = $1;
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$$->name = $3;
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}
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| Iconst
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{
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$$ = makeNode(JoinUsing);
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$$->resno = $1;
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$$->range = NULL;
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$$->name = NULL;
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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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$$ = (Node *)n;
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}
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;
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@ -4737,12 +4795,15 @@ case_expr: CASE case_arg when_clause_list case_default END_TRANS
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{
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CaseExpr *c = makeNode(CaseExpr);
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CaseWhen *w = makeNode(CaseWhen);
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/*
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A_Const *n = makeNode(A_Const);
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n->val.type = T_Null;
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w->result = (Node *)n;
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*/
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w->expr = makeA_Expr(OP, "=", $3, $5);
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c->args = lcons(w, NIL);
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c->defresult = $3;
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w->expr = makeA_Expr(OP, "=", $3, $5);
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$$ = (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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@ -4757,8 +4818,6 @@ case_expr: CASE case_arg when_clause_list case_default END_TRANS
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c->args = lappend(c->args, w);
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}
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$$ = (Node *)c;
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elog(NOTICE,"COALESCE() not yet fully implemented");
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}
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;
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@ -5147,7 +5206,6 @@ ColLabel: ColId { $$ = $1; }
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| COALESCE { $$ = "coalesce"; }
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| CONSTRAINT { $$ = "constraint"; }
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| COPY { $$ = "copy"; }
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| CROSS { $$ = "cross"; }
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| CURRENT { $$ = "current"; }
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| DO { $$ = "do"; }
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| ELSE { $$ = "else"; }
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@ -5210,7 +5268,8 @@ makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr)
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/* makeRowExpr()
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* Generate separate operator nodes for a single row descriptor expression.
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* Perhaps this should go deeper in the parser someday... - thomas 1997-12-22
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* Perhaps this should go deeper in the parser someday...
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* - thomas 1997-12-22
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*/
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static Node *
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makeRowExpr(char *opr, List *largs, List *rargs)
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@ -5250,23 +5309,6 @@ makeRowExpr(char *opr, List *largs, List *rargs)
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elog(ERROR,"Operator '%s' not implemented for row expressions",opr);
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}
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#ifdef NOT_USED
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while ((largs != NIL) && (rargs != NIL))
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{
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larg = lfirst(largs);
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rarg = lfirst(rargs);
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if (expr == NULL)
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expr = makeA_Expr(OP, opr, larg, rarg);
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else
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expr = makeA_Expr(AND, NULL, expr, makeA_Expr(OP, opr, larg, rarg));
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largs = lnext(largs);
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rargs = lnext(rargs);
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}
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pprint(expr);
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#endif
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return expr;
|
||||
}
|
||||
|
||||
|
||||
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Reference in New Issue
Block a user