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Add support for the CASE statement in the rewrite handling.

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Allows (at least some) rules and views.
Still some trouble (crashes) with target CASE columns spanning tables,
 but lots now works.
This commit is contained in:
Thomas G. Lockhart
1998-12-14 00:02:17 +00:00
parent 2b189aa953
commit 4140c2f30e
6 changed files with 250 additions and 13 deletions
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50
src/backend/nodes/readfuncs.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.39 1998/11/22 10:48:40 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.40 1998/12/14 00:01:47 thomas Exp $
*
* NOTES
* Most of the read functions for plan nodes are tested. (In fact, they
@ -786,6 +786,50 @@ _readExpr()
return local_node;
}
/* ----------------
* _readCaseExpr
*
* CaseExpr is a subclass of Node
* ----------------
*/
static CaseExpr *
_readCaseExpr()
{
CaseExpr *local_node;
char *token;
int length;
local_node = makeNode(CaseExpr);
local_node->args = nodeRead(true);
token = lsptok(NULL, &length); /* eat :default */
local_node->defresult = nodeRead(true);
return local_node;
}
/* ----------------
* _readCaseWhen
*
* CaseWhen is a subclass of Node
* ----------------
*/
static CaseWhen *
_readCaseWhen()
{
CaseWhen *local_node;
char *token;
int length;
local_node = makeNode(CaseWhen);
local_node->expr = nodeRead(true);
token = lsptok(NULL, &length); /* eat :then */
local_node->result = nodeRead(true);
return local_node;
}
/* ----------------
* _readVar
*
@ -2037,6 +2081,10 @@ parsePlanString(void)
return_value = _readSortClause();
else if (!strncmp(token, "GROUPCLAUSE", length))
return_value = _readGroupClause();
else if (!strncmp(token, "CASE", length))
return_value = _readCaseExpr();
else if (!strncmp(token, "WHEN", length))
return_value = _readCaseWhen();
else
elog(ERROR, "badly formatted planstring \"%.10s\"...\n", token);