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Eliminate pg_rewrite.ev_attr column and related dead code.

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Commit 95ef6a3448 removed the
ability to create rules on an individual column as of 7.3, but
left some residual code which has since been useless.  This cleans
up that dead code without any change in behavior other than
dropping the useless column from the catalog.
This commit is contained in:
Kevin Grittner
2013-09-05 14:03:43 -05:00
parent 20cb18db46
commit 277607d600
11 changed files with 9 additions and 125 deletions
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64
src/backend/rewrite/rewriteManip.c
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@@ -857,70 +857,6 @@ rangeTableEntry_used(Node *node, int rt_index, int sublevels_up)
}
/*
* attribute_used -
* Check if a specific attribute number of a RTE is used
* somewhere in the query or expression.
*/
typedef struct
{
int rt_index;
int attno;
int sublevels_up;
} attribute_used_context;
static bool
attribute_used_walker(Node *node,
attribute_used_context *context)
{
if (node == NULL)
return false;
if (IsA(node, Var))
{
Var *var = (Var *) node;
if (var->varlevelsup == context->sublevels_up &&
var->varno == context->rt_index &&
var->varattno == context->attno)
return true;
return false;
}
if (IsA(node, Query))
{
/* Recurse into subselects */
bool result;
context->sublevels_up++;
result = query_tree_walker((Query *) node, attribute_used_walker,
(void *) context, 0);
context->sublevels_up--;
return result;
}
return expression_tree_walker(node, attribute_used_walker,
(void *) context);
}
bool
attribute_used(Node *node, int rt_index, int attno, int sublevels_up)
{
attribute_used_context context;
context.rt_index = rt_index;
context.attno = attno;
context.sublevels_up = sublevels_up;
/*
* Must be prepared to start with a Query or a bare expression tree; if
* it's a Query, we don't want to increment sublevels_up.
*/
return query_or_expression_tree_walker(node,
attribute_used_walker,
(void *) &context,
0);
}
/*
* If the given Query is an INSERT ... SELECT construct, extract and
* return the sub-Query node that represents the SELECT part. Otherwise