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Check that user-specified opclass in CREATE INDEX corresponds to operators

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that will actually work on the column datatype.
This commit is contained in:
Tom Lane 2000-04-25 02:45:54 +00:00
parent e308786889
commit f46c1f1e33
1 changed files with 41 additions and 2 deletions
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43
src/backend/commands/indexcmds.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/indexcmds.c,v 1.24 2000/04/23 01:44:55 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/indexcmds.c,v 1.25 2000/04/25 02:45:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -24,6 +24,7 @@
#include "catalog/pg_database.h"
#include "catalog/pg_index.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_shadow.h"
#include "catalog/pg_type.h"
@ -32,6 +33,7 @@
#include "optimizer/planmain.h"
#include "optimizer/prep.h"
#include "parser/parsetree.h"
#include "parser/parse_coerce.h"
#include "parser/parse_func.h"
#include "parser/parse_type.h"
#include "utils/builtins.h"
@ -556,7 +558,9 @@ GetAttrOpClass(IndexElem *attribute, Oid attrType,
HeapScanDesc scan;
ScanKeyData entry[2];
HeapTuple tuple;
Oid opClassId;
Oid opClassId,
oprId;
bool doTypeCheck = true;
if (attribute->class == NULL)
{
@ -565,6 +569,8 @@ GetAttrOpClass(IndexElem *attribute, Oid attrType,
if (attribute->class == NULL)
elog(ERROR, "DefineIndex: type %s has no default operator class",
typeidTypeName(attrType));
/* assume we need not check type compatibility */
doTypeCheck = false;
}
tuple = SearchSysCacheTuple(CLANAME,
@ -597,9 +603,42 @@ GetAttrOpClass(IndexElem *attribute, Oid attrType,
attribute->class, accessMethodName);
}
oprId = ((Form_pg_amop) GETSTRUCT(tuple))->amopopr;
heap_endscan(scan);
heap_close(relation, AccessShareLock);
/*
* Make sure the operators associated with this opclass actually accept
* the column data type. This prevents possible coredumps caused by
* user errors like applying text_ops to an int4 column. We will accept
* an opclass as OK if the operator's input datatype is binary-compatible
* with the actual column datatype. Note we assume that all the operators
* associated with an opclass accept the same datatypes, so checking the
* first one we happened to find in the table is sufficient.
*
* If the opclass was the default for the datatype, assume we can skip
* this check --- that saves a few cycles in the most common case.
* If pg_opclass is messed up then we're probably screwed anyway...
*/
if (doTypeCheck)
{
tuple = SearchSysCacheTuple(OPEROID,
ObjectIdGetDatum(oprId),
0, 0, 0);
if (HeapTupleIsValid(tuple))
{
Form_pg_operator optup = (Form_pg_operator) GETSTRUCT(tuple);
Oid opInputType = (optup->oprkind == 'l') ?
optup->oprright : optup->oprleft;
if (attrType != opInputType &&
! IS_BINARY_COMPATIBLE(attrType, opInputType))
elog(ERROR, "DefineIndex: opclass \"%s\" does not accept datatype \"%s\"",
attribute->class, typeidTypeName(attrType));
}
}
return opClassId;
}