database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-09-11 00:12:06 +03:00
Code Activity

Phase 3 of read-only-plans project: ExecInitExpr now builds expression

Browse Source 
execution state trees, and ExecEvalExpr takes an expression state tree
not an expression plan tree.  The plan tree is now read-only as far as
the executor is concerned.  Next step is to begin actually exploiting
this property.
This commit is contained in:
Tom Lane
2002-12-13 19:46:01 +00:00
parent 77b7a740f9
commit 3a4f7dde16
49 changed files with 993 additions and 815 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/backend/optimizer/path/indxpath.c
View File

@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/indxpath.c,v 1.127 2002/12/12 15:49:28 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/indxpath.c,v 1.128 2002/12/13 19:45:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1124,6 +1124,7 @@ pred_test_simple_clause(Expr *predicate, Node *clause)
clause_strategy,
test_strategy;
Expr *test_expr;
ExprState *test_exprstate;
Datum test_result;
bool isNull;
Relation relation;
@@ -1274,9 +1275,10 @@ pred_test_simple_clause(Expr *predicate, Node *clause)
(Expr *) clause_const,
(Expr *) pred_const);
set_opfuncid((OpExpr *) test_expr);
test_exprstate = ExecInitExpr(test_expr, NULL);
econtext = MakeExprContext(NULL, TransactionCommandContext);
test_result = ExecEvalExprSwitchContext((Node *) test_expr, econtext,
econtext = MakeExprContext(NULL, CurrentMemoryContext);
test_result = ExecEvalExprSwitchContext(test_exprstate, econtext,
&isNull, NULL);
FreeExprContext(econtext);

21
src/backend/optimizer/util/clauses.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.117 2002/12/12 20:35:12 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.118 2002/12/13 19:45:56 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -1315,7 +1315,18 @@ eval_const_expressions_mutator(Node *node, List *active_fns)
simple = simplify_function(expr->opfuncid, args,
false, active_fns);
if (simple) /* successfully simplified it */
return (Node *) simple;
{
/*
* Since the underlying operator is "=", must negate its
* result
*/
Const *csimple = (Const *) simple;
Assert(IsA(csimple, Const));
csimple->constvalue =
BoolGetDatum(!DatumGetBool(csimple->constvalue));
return (Node *) csimple;
}
}
/*
@@ -1672,6 +1683,7 @@ evaluate_function(Oid funcid, List *args, HeapTuple func_tuple)
bool has_nonconst_input = false;
bool has_null_input = false;
FuncExpr *newexpr;
ExprState *newexprstate;
ExprContext *econtext;
Datum const_val;
bool const_is_null;
@@ -1738,7 +1750,9 @@ evaluate_function(Oid funcid, List *args, HeapTuple func_tuple)
*/
econtext = MakeExprContext(NULL, CurrentMemoryContext);
const_val = ExecEvalExprSwitchContext((Node *) newexpr, econtext,
newexprstate = ExecInitExpr((Expr *) newexpr, NULL);
const_val = ExecEvalExprSwitchContext(newexprstate, econtext,
&const_is_null, NULL);
/* Must copy result out of sub-context used by expression eval */
@@ -1746,7 +1760,6 @@ evaluate_function(Oid funcid, List *args, HeapTuple func_tuple)
const_val = datumCopy(const_val, resultTypByVal, resultTypLen);
FreeExprContext(econtext);
pfree(newexpr);
/*
* Make the constant result node.