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Code review for UPDATE SET (columnlist) patch. Make it handle as much
of the syntax as this fundamentally dead-end approach can, in particular combinations of single and multi column assignments. Improve rather inadequate documentation and provide some regression tests.
This commit is contained in:
Tom Lane
@ -11,7 +11,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.564 2006/09/03 03:19:44 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.565 2006/09/03 22:37:05 tgl Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -236,9 +236,9 @@ static void doNegateFloat(Value *v);
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name_list from_clause from_list opt_array_bounds
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qualified_name_list any_name any_name_list
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any_operator expr_list attrs
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target_list update_col_list update_target_list
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update_value_list set_opt insert_column_list
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values_list def_list indirection opt_indirection
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target_list insert_column_list set_target_list
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set_clause_list set_clause multiple_set_clause
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ctext_expr_list ctext_row def_list indirection opt_indirection
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group_clause TriggerFuncArgs select_limit
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opt_select_limit opclass_item_list
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transaction_mode_list_or_empty
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@ -299,7 +299,7 @@ static void doNegateFloat(Value *v);
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%type <list> when_clause_list
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%type <ival> sub_type
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%type <list> OptCreateAs CreateAsList
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%type <node> CreateAsElement values_item
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%type <node> CreateAsElement ctext_expr
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%type <value> NumericOnly FloatOnly IntegerOnly
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%type <alias> alias_clause
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%type <sortby> sortby
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@ -308,8 +308,7 @@ static void doNegateFloat(Value *v);
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%type <jexpr> joined_table
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%type <range> relation_expr
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%type <range> relation_expr_opt_alias
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%type <target> target_el update_target_el update_col_list_el insert_column_item
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%type <list> update_target_lists_list update_target_lists_el
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%type <target> target_el single_set_clause set_target insert_column_item
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%type <typnam> Typename SimpleTypename ConstTypename
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GenericType Numeric opt_float
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@ -5488,7 +5487,7 @@ opt_nowait: NOWAIT { $$ = TRUE; }
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*****************************************************************************/
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UpdateStmt: UPDATE relation_expr_opt_alias
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SET set_opt
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SET set_clause_list
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from_clause
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where_clause
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returning_clause
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@ -5503,9 +5502,65 @@ UpdateStmt: UPDATE relation_expr_opt_alias
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}
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;
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set_opt:
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update_target_list { $$ = $1; }
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| update_target_lists_list { $$ = $1; }
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set_clause_list:
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set_clause { $$ = $1; }
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| set_clause_list ',' set_clause { $$ = list_concat($1,$3); }
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;
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set_clause:
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single_set_clause { $$ = list_make1($1); }
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| multiple_set_clause { $$ = $1; }
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;
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single_set_clause:
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set_target '=' ctext_expr
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{
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$$ = $1;
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$$->val = (Node *) $3;
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}
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;
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multiple_set_clause:
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'(' set_target_list ')' '=' ctext_row
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{
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ListCell *col_cell;
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ListCell *val_cell;
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/*
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* Break the ctext_row apart, merge individual expressions
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* into the destination ResTargets. XXX this approach
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* cannot work for general row expressions as sources.
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*/
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if (list_length($2) != list_length($5))
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("number of columns does not match number of values")));
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forboth(col_cell, $2, val_cell, $5)
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{
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ResTarget *res_col = (ResTarget *) lfirst(col_cell);
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Node *res_val = (Node *) lfirst(val_cell);
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res_col->val = res_val;
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}
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$$ = $2;
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}
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;
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set_target:
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ColId opt_indirection
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{
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$$ = makeNode(ResTarget);
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$$->name = $1;
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$$->indirection = $2;
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$$->val = NULL; /* upper production sets this */
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$$->location = @1;
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}
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;
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set_target_list:
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set_target { $$ = list_make1($1); }
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| set_target_list ',' set_target { $$ = lappend($1,$3); }
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;
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@ -5887,83 +5942,20 @@ locked_rels_list:
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values_clause:
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VALUES '(' values_list ')'
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VALUES ctext_row
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{
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SelectStmt *n = makeNode(SelectStmt);
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n->valuesLists = list_make1($3);
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n->valuesLists = list_make1($2);
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$$ = (Node *) n;
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}
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| values_clause ',' '(' values_list ')'
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| values_clause ',' ctext_row
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{
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SelectStmt *n = (SelectStmt *) $1;
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n->valuesLists = lappend(n->valuesLists, $4);
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n->valuesLists = lappend(n->valuesLists, $3);
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$$ = (Node *) n;
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}
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;
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values_list: values_item { $$ = list_make1($1); }
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| values_list ',' values_item { $$ = lappend($1, $3); }
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;
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values_item:
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a_expr { $$ = (Node *) $1; }
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| DEFAULT { $$ = (Node *) makeNode(SetToDefault); }
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;
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update_target_lists_list:
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update_target_lists_el { $$ = $1; }
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| update_target_lists_list ',' update_target_lists_el { $$ = list_concat($1, $3); }
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;
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update_target_lists_el:
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'(' update_col_list ')' '=' '(' update_value_list ')'
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{
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ListCell *col_cell;
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ListCell *val_cell;
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if (list_length($2) != list_length($6))
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{
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("number of columns does not match to number of values")));
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}
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for (col_cell = list_head($2), val_cell = list_head($6);
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col_cell != NULL && val_cell != NULL;
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col_cell = lnext(col_cell), val_cell = lnext(val_cell))
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{
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/* merge update_value_list with update_col_list */
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ResTarget *res_col = (ResTarget *) lfirst(col_cell);
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Node *res_val = (Node *) lfirst(val_cell);
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res_col->val = res_val;
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}
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$$ = $2;
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}
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;
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update_col_list:
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update_col_list_el { $$ = list_make1($1); }
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| update_col_list ',' update_col_list_el { $$ = lappend($1, $3); }
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;
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update_col_list_el:
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ColId opt_indirection
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{
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$$ = makeNode(ResTarget);
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$$->name = $1;
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$$->indirection = $2;
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$$->val = NULL;
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$$->location = @1;
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}
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;
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update_value_list:
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values_item { $$ = list_make1($1); }
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| update_value_list ',' values_item { $$ = lappend($1, $3); }
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;
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/*****************************************************************************
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*
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@ -8232,10 +8224,35 @@ opt_asymmetric: ASYMMETRIC
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| /*EMPTY*/
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;
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/*
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* The SQL spec defines "contextually typed value expressions" and
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* "contextually typed row value constructors", which for our purposes
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* are the same as "a_expr" and "row" except that DEFAULT can appear at
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* the top level.
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*/
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ctext_expr:
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a_expr { $$ = (Node *) $1; }
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| DEFAULT { $$ = (Node *) makeNode(SetToDefault); }
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;
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ctext_expr_list:
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ctext_expr { $$ = list_make1($1); }
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| ctext_expr_list ',' ctext_expr { $$ = lappend($1, $3); }
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;
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/*
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* We should allow ROW '(' ctext_expr_list ')' too, but that seems to require
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* making VALUES a fully reserved word, which will probably break more apps
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* than allowing the noise-word is worth.
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*/
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ctext_row: '(' ctext_expr_list ')' { $$ = $2; }
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;
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/*****************************************************************************
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*
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* target lists for SELECT, UPDATE, INSERT
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* target list for SELECT
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*
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*****************************************************************************/
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@ -8275,31 +8292,6 @@ target_el: a_expr AS ColLabel
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}
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;
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update_target_list:
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update_target_el { $$ = list_make1($1); }
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| update_target_list ',' update_target_el { $$ = lappend($1,$3); }
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;
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update_target_el:
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ColId opt_indirection '=' a_expr
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{
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$$ = makeNode(ResTarget);
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$$->name = $1;
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$$->indirection = $2;
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$$->val = (Node *) $4;
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$$->location = @1;
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}
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| ColId opt_indirection '=' DEFAULT
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{
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$$ = makeNode(ResTarget);
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$$->name = $1;
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$$->indirection = $2;
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$$->val = (Node *) makeNode(SetToDefault);
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$$->location = @1;
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}
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;
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/*****************************************************************************
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*
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