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@ -7,7 +7,7 @@ |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* IDENTIFICATION |
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* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.121 2003/06/25 04:19:24 momjian Exp $ |
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* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.122 2003/07/03 16:34:25 tgl Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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@ -250,7 +250,9 @@ adjustJoinTreeList(Query *parsetree, bool removert, int rt_index) |
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* attributes that have defaults and are not assigned to in the given tlist. |
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* (We do not insert anything for default-less attributes, however. The |
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* planner will later insert NULLs for them, but there's no reason to slow |
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* down rewriter processing with extra tlist nodes.) |
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* down rewriter processing with extra tlist nodes.) Also, for both INSERT |
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* and UPDATE, replace explicit DEFAULT specifications with column default |
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* expressions. |
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* |
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* 2. Merge multiple entries for the same target attribute, or declare error |
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* if we can't. Presently, multiple entries are only allowed for UPDATE of |
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@ -307,40 +309,49 @@ rewriteTargetList(Query *parsetree, Relation target_relation) |
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{ |
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Assert(strcmp(resdom->resname, |
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NameStr(att_tup->attname)) == 0); |
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if (old_tle->expr != NULL && IsA(old_tle->expr, SetToDefault)) |
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{ |
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/* Set to the default value of the column, as requested */ |
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Node *new_expr; |
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new_expr = build_column_default(target_relation, attrno); |
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new_tle = makeTargetEntry(makeResdom(attrno, |
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att_tup->atttypid, |
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att_tup->atttypmod, |
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pstrdup(NameStr(att_tup->attname)), |
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false), |
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(Expr *) new_expr); |
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} |
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else |
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/* Normal Case */ |
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new_tle = process_matched_tle(old_tle, new_tle); |
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new_tle = process_matched_tle(old_tle, new_tle); |
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/* keep scanning to detect multiple assignments to attr */ |
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} |
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} |
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if (new_tle == NULL && commandType == CMD_INSERT) |
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/*
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* Handle the two cases where we need to insert a default expression: |
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* it's an INSERT and there's no tlist entry for the column, or the |
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* tlist entry is a DEFAULT placeholder node. |
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*/ |
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if ((new_tle == NULL && commandType == CMD_INSERT) || |
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(new_tle && new_tle->expr && IsA(new_tle->expr, SetToDefault))) |
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{ |
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/*
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* Didn't find a matching tlist entry; if it's an INSERT, look |
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* for a default value, and add a tlist entry computing the |
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* default if we find one. |
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*/ |
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Node *new_expr; |
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new_expr = build_column_default(target_relation, attrno); |
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/*
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* If there is no default (ie, default is effectively NULL), |
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* we can omit the tlist entry in the INSERT case, since the |
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* planner can insert a NULL for itself, and there's no point |
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* in spending any more rewriter cycles on the entry. But in the |
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* UPDATE case we've got to explicitly set the column to NULL. |
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*/ |
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if (!new_expr) |
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{ |
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if (commandType == CMD_INSERT) |
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new_tle = NULL; |
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else |
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{ |
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new_expr = (Node *) makeConst(att_tup->atttypid, |
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att_tup->attlen, |
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(Datum) 0, |
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true, /* isnull */ |
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att_tup->attbyval); |
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/* this is to catch a NOT NULL domain constraint */ |
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new_expr = coerce_to_domain(new_expr, |
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InvalidOid, |
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att_tup->atttypid, |
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COERCE_IMPLICIT_CAST); |
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} |
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} |
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if (new_expr) |
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new_tle = makeTargetEntry(makeResdom(attrno, |
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att_tup->atttypid, |
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Tom Lane
23 years ago