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Commit1c5b902

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Fix problem in which sloppily-coded test in ExecInitIndexScan would
think that both sides of indexqual look like index keys. An example iscreate table inside (f1 float8 primary key);create table outside (g1 float8, g2 float8);select * from inside,outside where f1 = atan2(g1+1, g2);ERROR: ExecInitIndexScan: both left and right ops are rel-vars(note that failure is potentially platform-dependent). Solution is acleanup I had had in mind to make anyway: functional index keys shouldbe represented as Var nodes in the fixed indexqual, just like regularindex keys.
1 parent1c8244e commit1c5b902

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2 files changed

+36
-60
lines changed

2 files changed

+36
-60
lines changed

‎src/backend/executor/nodeIndexscan.c‎

Lines changed: 17 additions & 46 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/executor/nodeIndexscan.c,v 1.49 2000/04/12 17:15:09 momjian Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/executor/nodeIndexscan.c,v 1.50 2000/05/23 16:56:37 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -734,8 +734,8 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
734734
*/
735735
for (j=0;j<n_keys;j++)
736736
{
737-
Expr*clause;/* onepart of index qual */
738-
Oper*op;/* operator used inscan.. */
737+
Expr*clause;/* oneclause of index qual */
738+
Oper*op;/* operator used inclause */
739739
Node*leftop;/* expr on lhs of operator */
740740
Node*rightop;/* expr on rhs ... */
741741
bits16flags=0;
@@ -794,6 +794,7 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
794794
*/
795795

796796
scanvar=NO_OP;
797+
run_keys[j]=NO_OP;
797798

798799
/* ----------------
799800
*determine information in leftop
@@ -803,7 +804,7 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
803804

804805
Assert(leftop!=NULL);
805806

806-
if (IsA(leftop,Var)&&var_is_rel((Var*)leftop))
807+
if (IsA(leftop,Var)&&var_is_rel((Var*)leftop))
807808
{
808809
/* ----------------
809810
*if the leftop is a "rel-var", then it means
@@ -814,28 +815,16 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
814815
varattno= ((Var*)leftop)->varattno;
815816
scanvar=LEFT_OP;
816817
}
817-
elseif (is_funcclause(leftop)&&
818-
var_is_rel(lfirst(((Expr*)leftop)->args)))
819-
{
820-
/* ----------------
821-
*if the leftop is a func node then it means
822-
*it identifies the value to place in our scan key.
823-
*Since functional indices have only one attribute
824-
*the attno must always be set to 1.
825-
* ----------------
826-
*/
827-
varattno=1;
828-
scanvar=LEFT_OP;
829-
}
830818
elseif (IsA(leftop,Const))
831819
{
832820
/* ----------------
833821
*if the leftop is a const node then it means
834822
*it identifies the value to place in our scan key.
835823
* ----------------
836824
*/
837-
run_keys[j]=NO_OP;
838825
scanvalue= ((Const*)leftop)->constvalue;
826+
if (((Const*)leftop)->constisnull)
827+
flags |=SK_ISNULL;
839828
}
840829
elseif (IsA(leftop,Param))
841830
{
@@ -850,32 +839,31 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
850839
/* Life was so easy before ... subselects */
851840
if (((Param*)leftop)->paramkind==PARAM_EXEC)
852841
{
842+
/* treat Param as runtime key */
853843
have_runtime_keys= true;
854844
run_keys[j]=LEFT_OP;
855845
execParam=lappendi(execParam, ((Param*)leftop)->paramid);
856846
}
857847
else
858848
{
849+
/* treat Param like a constant */
859850
scanvalue=ExecEvalParam((Param*)leftop,
860851
scanstate->cstate.cs_ExprContext,
861852
&isnull);
862853
if (isnull)
863854
flags |=SK_ISNULL;
864-
865-
run_keys[j]=NO_OP;
866855
}
867856
}
868857
else
869858
{
870859
/* ----------------
871-
*otherwise, the leftop containsinformation usable
860+
*otherwise, the leftop containsan expression evaluable
872861
*at runtime to figure out the value to place in our
873862
*scan key.
874863
* ----------------
875864
*/
876865
have_runtime_keys= true;
877866
run_keys[j]=LEFT_OP;
878-
scanvalue=Int32GetDatum((int32) true);
879867
}
880868

881869
/* ----------------
@@ -886,7 +874,7 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
886874

887875
Assert(rightop!=NULL);
888876

889-
if (IsA(rightop,Var)&&var_is_rel((Var*)rightop))
877+
if (IsA(rightop,Var)&&var_is_rel((Var*)rightop))
890878
{
891879
/* ----------------
892880
*here we make sure only one op identifies the
@@ -906,32 +894,16 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
906894
varattno= ((Var*)rightop)->varattno;
907895
scanvar=RIGHT_OP;
908896
}
909-
elseif (is_funcclause(rightop)&&
910-
var_is_rel(lfirst(((Expr*)rightop)->args)))
911-
{
912-
/* ----------------
913-
*if the rightop is a func node then it means
914-
*it identifies the value to place in our scan key.
915-
*Since functional indices have only one attribute
916-
*the attno must always be set to 1.
917-
* ----------------
918-
*/
919-
if (scanvar==LEFT_OP)
920-
elog(ERROR,"ExecInitIndexScan: %s",
921-
"both left and right ops are rel-vars");
922-
923-
varattno=1;
924-
scanvar=RIGHT_OP;
925-
}
926897
elseif (IsA(rightop,Const))
927898
{
928899
/* ----------------
929900
*if the rightop is a const node then it means
930901
*it identifies the value to place in our scan key.
931902
* ----------------
932903
*/
933-
run_keys[j]=NO_OP;
934904
scanvalue= ((Const*)rightop)->constvalue;
905+
if (((Const*)rightop)->constisnull)
906+
flags |=SK_ISNULL;
935907
}
936908
elseif (IsA(rightop,Param))
937909
{
@@ -946,32 +918,31 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
946918
/* Life was so easy before ... subselects */
947919
if (((Param*)rightop)->paramkind==PARAM_EXEC)
948920
{
921+
/* treat Param as runtime key */
949922
have_runtime_keys= true;
950923
run_keys[j]=RIGHT_OP;
951924
execParam=lappendi(execParam, ((Param*)rightop)->paramid);
952925
}
953926
else
954927
{
928+
/* treat Param like a constant */
955929
scanvalue=ExecEvalParam((Param*)rightop,
956930
scanstate->cstate.cs_ExprContext,
957931
&isnull);
958932
if (isnull)
959933
flags |=SK_ISNULL;
960-
961-
run_keys[j]=NO_OP;
962934
}
963935
}
964936
else
965937
{
966938
/* ----------------
967-
*otherwise, the rightop containsinformation usable
939+
*otherwise, the rightop containsan expression evaluable
968940
*at runtime to figure out the value to place in our
969941
*scan key.
970942
* ----------------
971943
*/
972944
have_runtime_keys= true;
973945
run_keys[j]=RIGHT_OP;
974-
scanvalue=Int32GetDatum((int32) true);
975946
}
976947

977948
/* ----------------
@@ -992,7 +963,7 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
992963
varattno,/* attribute number to
993964
* scan */
994965
(RegProcedure)opid,/* reg proc to use */
995-
(Datum)scanvalue);/* constant */
966+
scanvalue);/* constant */
996967
}
997968

998969
/* ----------------

‎src/backend/optimizer/plan/createplan.c‎

Lines changed: 19 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
1010
*
1111
*
1212
* IDENTIFICATION
13-
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.89 2000/04/12 17:15:21 momjian Exp $
13+
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.90 2000/05/23 16:56:36 tgl Exp $
1414
*
1515
*-------------------------------------------------------------------------
1616
*/
@@ -27,6 +27,7 @@
2727
#include"optimizer/planmain.h"
2828
#include"optimizer/restrictinfo.h"
2929
#include"optimizer/tlist.h"
30+
#include"parser/parse_expr.h"
3031
#include"utils/lsyscache.h"
3132
#include"utils/syscache.h"
3233

@@ -722,7 +723,7 @@ create_hashjoin_node(HashPath *best_path,
722723
* machinery needs.
723724
*
724725
* We have three tasks here:
725-
**Var nodes representing index keys must havevarattnoequal to the
726+
**Index keys must be represented by Var nodes withvarattnoset to the
726727
* index's attribute number, not the attribute number in the original rel.
727728
** indxpath.c may have selected an index that is binary-compatible with
728729
* the actual expression operator, but not exactly the same datatype.
@@ -789,7 +790,7 @@ fix_indxqual_references(List *indexquals, IndexPath *index_path)
789790
* Fix the sublist of indexquals to be used in a particular scan.
790791
*
791792
* For each qual clause, commute if needed to put the indexkey operand on the
792-
* left, and thenchange itsvarno. (We do not need to change the other side
793+
* left, and thenfix itsvarattno. (We do not need to change the other side
793794
* of the clause.)Also change the operator if necessary.
794795
*/
795796
staticList*
@@ -863,8 +864,16 @@ static Node *
863864
fix_indxqual_operand(Node*node,intbaserelid,Form_pg_indexindex,
864865
Oid*opclass)
865866
{
867+
/*
868+
* We represent index keys by Var nodes having the varno of the base
869+
* table but varattno equal to the index's attribute number (index
870+
* column position). This is a bit hokey ... would be cleaner to use
871+
* a special-purpose node type that could not be mistaken for a regular
872+
* Var. But it will do for now.
873+
*/
866874
if (IsA(node,Var))
867875
{
876+
/* If it's a var, find which index key position it occupies */
868877
if (((Var*)node)->varno==baserelid)
869878
{
870879
intvaratt= ((Var*)node)->varattno;
@@ -877,6 +886,7 @@ fix_indxqual_operand(Node *node, int baserelid, Form_pg_index index,
877886
Node*newnode=copyObject(node);
878887

879888
((Var*)newnode)->varattno=pos+1;
889+
/* return the correct opclass, too */
880890
*opclass=index->indclass[pos];
881891
returnnewnode;
882892
}
@@ -890,22 +900,17 @@ fix_indxqual_operand(Node *node, int baserelid, Form_pg_index index,
890900
}
891901

892902
/*
893-
* Else, it must be a func expression representing a functional index.
894-
*
895-
* Currently, there is no need for us to do anything here for functional
896-
* indexes. If nodeIndexscan.c sees a func clause as the left or
897-
* right-hand toplevel operand of an indexqual, it assumes that that
898-
* is a reference to the functional index's value and makes the
899-
* appropriate substitution. (It would be cleaner to make the
900-
* substitution here, I think --- suspect this issue if a join clause
901-
* involving a function call misbehaves...)
903+
* Else, it must be a func expression matching a functional index.
904+
* Since we currently only support single-column functional indexes,
905+
* the returned varattno must be 1.
902906
*/
903907

908+
Assert(is_funcclause(node));/* not a very thorough check, but easy */
909+
904910
/* indclass[0] is the only class of a functional index */
905911
*opclass=index->indclass[0];
906912

907-
/* return the unmodified node */
908-
returnnode;
913+
return (Node*)makeVar(baserelid,1,exprType(node),-1,0);
909914
}
910915

911916
/*

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