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Fix problems with cached tuple descriptors disappearing while still in use

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by creating a reference-count mechanism, similar to what we did a long time
ago for catcache entries.  The back branches have an ugly solution involving
lots of extra copies, but this way is more efficient.  Reference counting is
only applied to tupdescs that are actually in caches --- there seems no need
to use it for tupdescs that are generated in the executor, since they'll go
away during plan shutdown by virtue of being in the per-query memory context.
Neil Conway and Tom Lane
This commit is contained in:
Tom Lane
2006-06-16 18:42:24 +00:00
parent b49ce32da1
commit 06e10abc0b
36 changed files with 581 additions and 246 deletions
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11
src/backend/utils/adt/ruleutils.c
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@ -2,7 +2,7 @@
* ruleutils.c - Functions to convert stored expressions/querytrees
* back to source text
*
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.223 2006/05/28 21:13:53 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.224 2006/06/16 18:42:22 tgl Exp $
**********************************************************************/
#include "postgres.h"
@ -2697,7 +2697,8 @@ get_name_for_var_field(Var *var, int fieldno,
* appropriate error message while failing.
*/
if (get_expr_result_type(expr, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
tupleDesc = lookup_rowtype_tupdesc(exprType(expr), exprTypmod(expr));
tupleDesc = lookup_rowtype_tupdesc_copy(exprType(expr),
exprTypmod(expr));
/* Got the tupdesc, so we can extract the field name */
Assert(fieldno >= 1 && fieldno <= tupleDesc->natts);
@ -3312,8 +3313,8 @@ get_rule_expr(Node *node, deparse_context *context,
TupleDesc tupdesc;
if (get_expr_result_type(arg, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
tupdesc = lookup_rowtype_tupdesc(exprType(arg),
exprTypmod(arg));
tupdesc = lookup_rowtype_tupdesc_copy(exprType(arg),
exprTypmod(arg));
Assert(tupdesc);
/* Got the tupdesc, so we can extract the field name */
Assert(fno >= 1 && fno <= tupdesc->natts);
@ -3514,6 +3515,8 @@ get_rule_expr(Node *node, deparse_context *context,
}
i++;
}
ReleaseTupleDesc(tupdesc);
}
appendStringInfo(buf, ")");
if (rowexpr->row_format == COERCE_EXPLICIT_CAST)