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Fix bogus test for hypothetical indexes in get_actual_variable_range().

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That function was supposing that indexoid == 0 for a hypothetical index,
but that is not likely to be true in any non-toy implementation of an index
adviser, since assigning a fake OID is the only way to know at EXPLAIN time
which hypothetical index got selected.  Fix by adding a flag to
IndexOptInfo to mark hypothetical indexes.  Back-patch to 9.0 where
get_actual_variable_range() was added.

Gurjeet Singh
This commit is contained in:
Tom Lane
2011-02-16 19:24:50 -05:00
parent 8e4b147312
commit 7422e0081d
4 changed files with 7 additions and 2 deletions
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2
src/backend/nodes/outfuncs.c
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@ -1611,10 +1611,12 @@ _outIndexOptInfo(StringInfo str, IndexOptInfo *node)
WRITE_UINT_FIELD(pages);
WRITE_FLOAT_FIELD(tuples, "%.0f");
WRITE_INT_FIELD(ncolumns);
WRITE_OID_FIELD(relam);
WRITE_NODE_FIELD(indexprs);
WRITE_NODE_FIELD(indpred);
WRITE_BOOL_FIELD(predOK);
WRITE_BOOL_FIELD(unique);
WRITE_BOOL_FIELD(hypothetical);
}
static void

1
src/backend/optimizer/util/plancat.c
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@ -275,6 +275,7 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
ChangeVarNodes((Node *) info->indpred, 1, varno, 0);
info->predOK = false; /* set later in indxpath.c */
info->unique = index->indisunique;
info->hypothetical = false;
/*
* Estimate the index size. If it's not a partial index, we lock

4
src/backend/utils/adt/selfuncs.c
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@ -4555,10 +4555,10 @@ get_actual_variable_range(PlannerInfo *root, VariableStatData *vardata,
continue;
/*
* The index list might include fictitious indexes inserted by a
* The index list might include hypothetical indexes inserted by a
* get_relation_info hook --- don't try to access them.
*/
if (!OidIsValid(index->indexoid))
if (index->hypothetical)
continue;
/*

2
src/include/nodes/relation.h
View File

@ -471,6 +471,8 @@ typedef struct IndexOptInfo
bool amsearchnulls; /* can AM search for NULL/NOT NULL entries? */
bool amhasgettuple; /* does AM have amgettuple interface? */
bool amhasgetbitmap; /* does AM have amgetbitmap interface? */
/* added in 9.0.4: */
bool hypothetical; /* true if index doesn't really exist */
} IndexOptInfo;