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Replace functional-index facility with expressional indexes. Any column

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of an index can now be a computed expression instead of a simple variable.
Restrictions on expressions are the same as for predicates (only immutable
functions, no sub-selects).  This fixes problems recently introduced with
inlining SQL functions, because the inlining transformation is applied to
both expression trees so the planner can still match them up.  Along the
way, improve efficiency of handling index predicates (both predicates and
index expressions are now cached by the relcache) and fix 7.3 oversight
that didn't record dependencies of predicate expressions.
This commit is contained in:
Tom Lane
2003-05-28 16:04:02 +00:00
parent e5f19598e0
commit fc8d970cbc
50 changed files with 1351 additions and 1283 deletions
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17
src/include/nodes/execnodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: execnodes.h,v 1.97 2003/04/08 23:20:04 tgl Exp $
* $Id: execnodes.h,v 1.98 2003/05/28 16:04:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -27,19 +27,17 @@
/* ----------------
* IndexInfo information
*
* this class holds the information needed to construct new index
* this struct holds the information needed to construct new index
* entries for a particular index. Used for both index_build and
* retail creation of index entries.
*
* NumIndexAttrs number of columns in this index
* (1 if a func. index, else same as NumKeyAttrs)
* NumKeyAttrs number of key attributes for this index
* (ie, number of attrs from underlying relation)
* KeyAttrNumbers underlying-rel attribute numbers used as keys
* (zeroes indicate expressions)
* Expressions expr trees for expression entries, or NIL if none
* ExpressionsState exec state for expressions, or NIL if none
* Predicate partial-index predicate, or NIL if none
* PredicateState exec state for predicate, or NIL if none
* FuncOid OID of function, or InvalidOid if not f. index
* FuncInfo fmgr lookup data for function, if FuncOid valid
* Unique is it a unique index?
* ----------------
*/
@ -47,12 +45,11 @@ typedef struct IndexInfo
{
NodeTag type;
int ii_NumIndexAttrs;
int ii_NumKeyAttrs;
AttrNumber ii_KeyAttrNumbers[INDEX_MAX_KEYS];
List *ii_Expressions; /* list of Expr */
List *ii_ExpressionsState; /* list of ExprState */
List *ii_Predicate; /* list of Expr */
List *ii_PredicateState; /* list of ExprState */
Oid ii_FuncOid;
FmgrInfo ii_FuncInfo;
bool ii_Unique;
} IndexInfo;