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Fix handling of expressions and predicates in REINDEX CONCURRENTLY
When copying the definition of an index rebuilt concurrently for the new entry, the index information was taken directly from the old index using the relation cache. In this case, predicates and expressions have some post-processing to prepare things for the planner, which loses some information including the collations added in any of them. This inconsistency can cause issues when attempting for example a table rewrite, and makes the new indexes rebuilt concurrently inconsistent with the old entries. In order to fix the problem, fetch expressions and predicates directly from the catalog of the old entry, and fill in IndexInfo for the new index with that. This makes the process more consistent with DefineIndex(), and the code is refactored with the addition of a routine to create an IndexInfo node. Reported-by: Manuel Rigger Author: Michael Paquier Discussion: https://postgr.es/m/CA+u7OA5Hp0ra235F3czPom_FyAd-3+XwSJmX95r1+sRPOJc9VQ@mail.gmail.com Backpatch-through: 12
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6 files changed

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-42
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6 files changed

+237
-42
lines changed

‎src/backend/catalog/index.c

Lines changed: 68 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -1197,7 +1197,8 @@ Oid
11971197
index_concurrently_create_copy(Relation heapRelation, Oid oldIndexId, const char *newName)
11981198
{
11991199
Relation indexRelation;
1200-
IndexInfo *indexInfo;
1200+
IndexInfo *oldInfo,
1201+
*newInfo;
12011202
Oid newIndexId = InvalidOid;
12021203
HeapTuple indexTuple,
12031204
classTuple;
@@ -1208,11 +1209,22 @@ index_concurrently_create_copy(Relation heapRelation, Oid oldIndexId, const char
12081209
int2vector *indcoloptions;
12091210
bool isnull;
12101211
List *indexColNames = NIL;
1212+
List *indexExprs = NIL;
1213+
List *indexPreds = NIL;
12111214

12121215
indexRelation = index_open(oldIndexId, RowExclusiveLock);
12131216

1214-
/* New index uses the same index information as old index */
1215-
indexInfo = BuildIndexInfo(indexRelation);
1217+
/* The new index needs some information from the old index */
1218+
oldInfo = BuildIndexInfo(indexRelation);
1219+
1220+
/*
1221+
* Concurrent build of an index with exclusion constraints is not
1222+
* supported.
1223+
*/
1224+
if (oldInfo->ii_ExclusionOps != NULL)
1225+
ereport(ERROR,
1226+
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1227+
errmsg("concurrent index creation for exclusion constraints is not supported")));
12161228

12171229
/* Get the array of class and column options IDs from index info */
12181230
indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(oldIndexId));
@@ -1236,14 +1248,64 @@ index_concurrently_create_copy(Relation heapRelation, Oid oldIndexId, const char
12361248
Anum_pg_class_reloptions, &isnull);
12371249

12381250
/*
1239-
* Extract the list of column names to be used for the index creation.
1251+
* Fetch the list of expressions and predicates directly from the
1252+
* catalogs. This cannot rely on the information from IndexInfo of the
1253+
* old index as these have been flattened for the planner.
12401254
*/
1241-
for (int i = 0; i < indexInfo->ii_NumIndexAttrs; i++)
1255+
if (oldInfo->ii_Expressions != NIL)
1256+
{
1257+
Datum exprDatum;
1258+
char *exprString;
1259+
1260+
exprDatum = SysCacheGetAttr(INDEXRELID, indexTuple,
1261+
Anum_pg_index_indexprs, &isnull);
1262+
Assert(!isnull);
1263+
exprString = TextDatumGetCString(exprDatum);
1264+
indexExprs = (List *) stringToNode(exprString);
1265+
pfree(exprString);
1266+
}
1267+
if (oldInfo->ii_Predicate != NIL)
1268+
{
1269+
Datum predDatum;
1270+
char *predString;
1271+
1272+
predDatum = SysCacheGetAttr(INDEXRELID, indexTuple,
1273+
Anum_pg_index_indpred, &isnull);
1274+
Assert(!isnull);
1275+
predString = TextDatumGetCString(predDatum);
1276+
indexPreds = (List *) stringToNode(predString);
1277+
1278+
/* Also convert to implicit-AND format */
1279+
indexPreds = make_ands_implicit((Expr *) indexPreds);
1280+
pfree(predString);
1281+
}
1282+
1283+
/*
1284+
* Build the index information for the new index. Note that rebuild of
1285+
* indexes with exclusion constraints is not supported, hence there is no
1286+
* need to fill all the ii_Exclusion* fields.
1287+
*/
1288+
newInfo = makeIndexInfo(oldInfo->ii_NumIndexAttrs,
1289+
oldInfo->ii_NumIndexKeyAttrs,
1290+
oldInfo->ii_Am,
1291+
indexExprs,
1292+
indexPreds,
1293+
oldInfo->ii_Unique,
1294+
false, /* not ready for inserts */
1295+
true);
1296+
1297+
/*
1298+
* Extract the list of column names and the column numbers for the new
1299+
* index information. All this information will be used for the index
1300+
* creation.
1301+
*/
1302+
for (int i = 0; i < oldInfo->ii_NumIndexAttrs; i++)
12421303
{
12431304
TupleDesc indexTupDesc = RelationGetDescr(indexRelation);
12441305
Form_pg_attribute att = TupleDescAttr(indexTupDesc, i);
12451306

12461307
indexColNames = lappend(indexColNames, NameStr(att->attname));
1308+
newInfo->ii_IndexAttrNumbers[i] = oldInfo->ii_IndexAttrNumbers[i];
12471309
}
12481310

12491311
/*
@@ -1259,7 +1321,7 @@ index_concurrently_create_copy(Relation heapRelation, Oid oldIndexId, const char
12591321
InvalidOid, /* parentIndexRelid */
12601322
InvalidOid, /* parentConstraintId */
12611323
InvalidOid, /* relFileNode */
1262-
indexInfo,
1324+
newInfo,
12631325
indexColNames,
12641326
indexRelation->rd_rel->relam,
12651327
indexRelation->rd_rel->reltablespace,

‎src/backend/commands/indexcmds.c

Lines changed: 13 additions & 33 deletions
Original file line numberDiff line numberDiff line change
@@ -202,18 +202,8 @@ CheckIndexCompatible(Oid oldId,
202202
* contains only key attributes, thus we're filling ii_NumIndexAttrs and
203203
* ii_NumIndexKeyAttrs with same value.
204204
*/
205-
indexInfo = makeNode(IndexInfo);
206-
indexInfo->ii_NumIndexAttrs = numberOfAttributes;
207-
indexInfo->ii_NumIndexKeyAttrs = numberOfAttributes;
208-
indexInfo->ii_Expressions = NIL;
209-
indexInfo->ii_ExpressionsState = NIL;
210-
indexInfo->ii_PredicateState = NULL;
211-
indexInfo->ii_ExclusionOps = NULL;
212-
indexInfo->ii_ExclusionProcs = NULL;
213-
indexInfo->ii_ExclusionStrats = NULL;
214-
indexInfo->ii_Am = accessMethodId;
215-
indexInfo->ii_AmCache = NULL;
216-
indexInfo->ii_Context = CurrentMemoryContext;
205+
indexInfo = makeIndexInfo(numberOfAttributes, numberOfAttributes,
206+
accessMethodId, NIL, NIL, false, false, false);
217207
typeObjectId = (Oid *) palloc(numberOfAttributes * sizeof(Oid));
218208
collationObjectId = (Oid *) palloc(numberOfAttributes * sizeof(Oid));
219209
classObjectId = (Oid *) palloc(numberOfAttributes * sizeof(Oid));
@@ -780,27 +770,17 @@ DefineIndex(Oid relationId,
780770

781771
/*
782772
* Prepare arguments for index_create, primarily an IndexInfo structure.
783-
* Note that ii_Predicate must be in implicit-AND format.
784-
*/
785-
indexInfo = makeNode(IndexInfo);
786-
indexInfo->ii_NumIndexAttrs = numberOfAttributes;
787-
indexInfo->ii_NumIndexKeyAttrs = numberOfKeyAttributes;
788-
indexInfo->ii_Expressions = NIL; /* for now */
789-
indexInfo->ii_ExpressionsState = NIL;
790-
indexInfo->ii_Predicate = make_ands_implicit((Expr *) stmt->whereClause);
791-
indexInfo->ii_PredicateState = NULL;
792-
indexInfo->ii_ExclusionOps = NULL;
793-
indexInfo->ii_ExclusionProcs = NULL;
794-
indexInfo->ii_ExclusionStrats = NULL;
795-
indexInfo->ii_Unique = stmt->unique;
796-
/* In a concurrent build, mark it not-ready-for-inserts */
797-
indexInfo->ii_ReadyForInserts = !stmt->concurrent;
798-
indexInfo->ii_Concurrent = stmt->concurrent;
799-
indexInfo->ii_BrokenHotChain = false;
800-
indexInfo->ii_ParallelWorkers = 0;
801-
indexInfo->ii_Am = accessMethodId;
802-
indexInfo->ii_AmCache = NULL;
803-
indexInfo->ii_Context = CurrentMemoryContext;
773+
* Note that predicates must be in implicit-AND format. In a concurrent
774+
* build, mark it not-ready-for-inserts.
775+
*/
776+
indexInfo = makeIndexInfo(numberOfAttributes,
777+
numberOfKeyAttributes,
778+
accessMethodId,
779+
NIL, /* expressions, NIL for now */
780+
make_ands_implicit((Expr *) stmt->whereClause),
781+
stmt->unique,
782+
!stmt->concurrent,
783+
stmt->concurrent);
804784

805785
typeObjectId = (Oid *) palloc(numberOfAttributes * sizeof(Oid));
806786
collationObjectId = (Oid *) palloc(numberOfAttributes * sizeof(Oid));

‎src/backend/nodes/makefuncs.c

Lines changed: 50 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,8 +1,8 @@
11
/*-------------------------------------------------------------------------
22
*
33
* makefuncs.c
4-
* creator functions for primitive nodes. The functions here are for
5-
* the most frequently created nodes.
4+
* creator functions for various nodes. The functions here are for the
5+
* most frequently created nodes.
66
*
77
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
@@ -733,6 +733,54 @@ make_ands_implicit(Expr *clause)
733733
return list_make1(clause);
734734
}
735735

736+
/*
737+
* makeIndexInfo
738+
* create an IndexInfo node
739+
*/
740+
IndexInfo *
741+
makeIndexInfo(int numattrs, int numkeyattrs, Oid amoid, List *expressions,
742+
List *predicates, bool unique, bool isready, bool concurrent)
743+
{
744+
IndexInfo *n = makeNode(IndexInfo);
745+
746+
n->ii_NumIndexAttrs = numattrs;
747+
n->ii_NumIndexKeyAttrs = numkeyattrs;
748+
Assert(n->ii_NumIndexKeyAttrs != 0);
749+
Assert(n->ii_NumIndexKeyAttrs <= n->ii_NumIndexAttrs);
750+
n->ii_Unique = unique;
751+
n->ii_ReadyForInserts = isready;
752+
n->ii_Concurrent = concurrent;
753+
754+
/* expressions */
755+
n->ii_Expressions = expressions;
756+
n->ii_ExpressionsState = NIL;
757+
758+
/* predicates */
759+
n->ii_Predicate = predicates;
760+
n->ii_PredicateState = NULL;
761+
762+
/* exclusion constraints */
763+
n->ii_ExclusionOps = NULL;
764+
n->ii_ExclusionProcs = NULL;
765+
n->ii_ExclusionStrats = NULL;
766+
767+
/* speculative inserts */
768+
n->ii_UniqueOps = NULL;
769+
n->ii_UniqueProcs = NULL;
770+
n->ii_UniqueStrats = NULL;
771+
772+
/* initialize index-build state to default */
773+
n->ii_BrokenHotChain = false;
774+
n->ii_ParallelWorkers = 0;
775+
776+
/* set up for possible use by index AM */
777+
n->ii_Am = amoid;
778+
n->ii_AmCache = NULL;
779+
n->ii_Context = CurrentMemoryContext;
780+
781+
return n;
782+
}
783+
736784
/*
737785
* makeGroupingSet
738786
*

‎src/include/nodes/makefuncs.h

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
11
/*-------------------------------------------------------------------------
22
*
33
* makefuncs.h
4-
* prototypes for the creator functions (for primitive nodes)
4+
* prototypes for the creator functions of various nodes
55
*
66
*
77
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
@@ -14,6 +14,7 @@
1414
#ifndef MAKEFUNC_H
1515
#define MAKEFUNC_H
1616

17+
#include "nodes/execnodes.h"
1718
#include "nodes/parsenodes.h"
1819

1920

@@ -92,6 +93,10 @@ extern Node *make_and_qual(Node *qual1, Node *qual2);
9293
extern Expr *make_ands_explicit(List *andclauses);
9394
extern List *make_ands_implicit(Expr *clause);
9495

96+
extern IndexInfo *makeIndexInfo(int numattrs, int numkeyattrs, Oid amoid,
97+
List *expressions, List *predicates,
98+
bool unique, bool isready, bool concurrent);
99+
95100
extern DefElem *makeDefElem(char *name, Node *arg, int location);
96101
extern DefElem *makeDefElemExtended(char *nameSpace, char *name, Node *arg,
97102
DefElemAction defaction, int location);

‎src/test/regress/expected/create_index.out

Lines changed: 72 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2170,6 +2170,78 @@ Indexes:
21702170
"concur_reindex_ind5" UNIQUE, btree (c1)
21712171

21722172
DROP TABLE concur_reindex_tab4;
2173+
-- Check handling of indexes with expressions and predicates. The
2174+
-- definitions of the rebuilt indexes should match the original
2175+
-- definitions.
2176+
CREATE TABLE concur_exprs_tab (c1 int , c2 boolean);
2177+
INSERT INTO concur_exprs_tab (c1, c2) VALUES (1369652450, FALSE),
2178+
(414515746, TRUE),
2179+
(897778963, FALSE);
2180+
CREATE UNIQUE INDEX concur_exprs_index_expr
2181+
ON concur_exprs_tab ((c1::text COLLATE "C"));
2182+
CREATE UNIQUE INDEX concur_exprs_index_pred ON concur_exprs_tab (c1)
2183+
WHERE (c1::text > 500000000::text COLLATE "C");
2184+
CREATE UNIQUE INDEX concur_exprs_index_pred_2
2185+
ON concur_exprs_tab ((1 / c1))
2186+
WHERE ('-H') >= (c2::TEXT) COLLATE "C";
2187+
SELECT pg_get_indexdef('concur_exprs_index_expr'::regclass);
2188+
pg_get_indexdef
2189+
---------------------------------------------------------------------------------------------------------------
2190+
CREATE UNIQUE INDEX concur_exprs_index_expr ON public.concur_exprs_tab USING btree (((c1)::text) COLLATE "C")
2191+
(1 row)
2192+
2193+
SELECT pg_get_indexdef('concur_exprs_index_pred'::regclass);
2194+
pg_get_indexdef
2195+
----------------------------------------------------------------------------------------------------------------------------------------------
2196+
CREATE UNIQUE INDEX concur_exprs_index_pred ON public.concur_exprs_tab USING btree (c1) WHERE ((c1)::text > ((500000000)::text COLLATE "C"))
2197+
(1 row)
2198+
2199+
SELECT pg_get_indexdef('concur_exprs_index_pred_2'::regclass);
2200+
pg_get_indexdef
2201+
--------------------------------------------------------------------------------------------------------------------------------------------------
2202+
CREATE UNIQUE INDEX concur_exprs_index_pred_2 ON public.concur_exprs_tab USING btree (((1 / c1))) WHERE ('-H'::text >= ((c2)::text COLLATE "C"))
2203+
(1 row)
2204+
2205+
REINDEX TABLE CONCURRENTLY concur_exprs_tab;
2206+
SELECT pg_get_indexdef('concur_exprs_index_expr'::regclass);
2207+
pg_get_indexdef
2208+
---------------------------------------------------------------------------------------------------------------
2209+
CREATE UNIQUE INDEX concur_exprs_index_expr ON public.concur_exprs_tab USING btree (((c1)::text) COLLATE "C")
2210+
(1 row)
2211+
2212+
SELECT pg_get_indexdef('concur_exprs_index_pred'::regclass);
2213+
pg_get_indexdef
2214+
----------------------------------------------------------------------------------------------------------------------------------------------
2215+
CREATE UNIQUE INDEX concur_exprs_index_pred ON public.concur_exprs_tab USING btree (c1) WHERE ((c1)::text > ((500000000)::text COLLATE "C"))
2216+
(1 row)
2217+
2218+
SELECT pg_get_indexdef('concur_exprs_index_pred_2'::regclass);
2219+
pg_get_indexdef
2220+
--------------------------------------------------------------------------------------------------------------------------------------------------
2221+
CREATE UNIQUE INDEX concur_exprs_index_pred_2 ON public.concur_exprs_tab USING btree (((1 / c1))) WHERE ('-H'::text >= ((c2)::text COLLATE "C"))
2222+
(1 row)
2223+
2224+
-- ALTER TABLE recreates the indexes, which should keep their collations.
2225+
ALTER TABLE concur_exprs_tab ALTER c2 TYPE TEXT;
2226+
SELECT pg_get_indexdef('concur_exprs_index_expr'::regclass);
2227+
pg_get_indexdef
2228+
---------------------------------------------------------------------------------------------------------------
2229+
CREATE UNIQUE INDEX concur_exprs_index_expr ON public.concur_exprs_tab USING btree (((c1)::text) COLLATE "C")
2230+
(1 row)
2231+
2232+
SELECT pg_get_indexdef('concur_exprs_index_pred'::regclass);
2233+
pg_get_indexdef
2234+
----------------------------------------------------------------------------------------------------------------------------------------------
2235+
CREATE UNIQUE INDEX concur_exprs_index_pred ON public.concur_exprs_tab USING btree (c1) WHERE ((c1)::text > ((500000000)::text COLLATE "C"))
2236+
(1 row)
2237+
2238+
SELECT pg_get_indexdef('concur_exprs_index_pred_2'::regclass);
2239+
pg_get_indexdef
2240+
------------------------------------------------------------------------------------------------------------------------------------------
2241+
CREATE UNIQUE INDEX concur_exprs_index_pred_2 ON public.concur_exprs_tab USING btree (((1 / c1))) WHERE ('-H'::text >= (c2 COLLATE "C"))
2242+
(1 row)
2243+
2244+
DROP TABLE concur_exprs_tab;
21732245
--
21742246
-- REINDEX SCHEMA
21752247
--

‎src/test/regress/sql/create_index.sql

Lines changed: 28 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -872,6 +872,34 @@ REINDEX INDEX CONCURRENTLY concur_reindex_ind5;
872872
\d concur_reindex_tab4
873873
DROP TABLE concur_reindex_tab4;
874874

875+
-- Check handling of indexes with expressions and predicates. The
876+
-- definitions of the rebuilt indexes should match the original
877+
-- definitions.
878+
CREATE TABLE concur_exprs_tab (c1 int , c2 boolean);
879+
INSERT INTO concur_exprs_tab (c1, c2) VALUES (1369652450, FALSE),
880+
(414515746, TRUE),
881+
(897778963, FALSE);
882+
CREATE UNIQUE INDEX concur_exprs_index_expr
883+
ON concur_exprs_tab ((c1::text COLLATE "C"));
884+
CREATE UNIQUE INDEX concur_exprs_index_pred ON concur_exprs_tab (c1)
885+
WHERE (c1::text > 500000000::text COLLATE "C");
886+
CREATE UNIQUE INDEX concur_exprs_index_pred_2
887+
ON concur_exprs_tab ((1 / c1))
888+
WHERE ('-H') >= (c2::TEXT) COLLATE "C";
889+
SELECT pg_get_indexdef('concur_exprs_index_expr'::regclass);
890+
SELECT pg_get_indexdef('concur_exprs_index_pred'::regclass);
891+
SELECT pg_get_indexdef('concur_exprs_index_pred_2'::regclass);
892+
REINDEX TABLE CONCURRENTLY concur_exprs_tab;
893+
SELECT pg_get_indexdef('concur_exprs_index_expr'::regclass);
894+
SELECT pg_get_indexdef('concur_exprs_index_pred'::regclass);
895+
SELECT pg_get_indexdef('concur_exprs_index_pred_2'::regclass);
896+
-- ALTER TABLE recreates the indexes, which should keep their collations.
897+
ALTER TABLE concur_exprs_tab ALTER c2 TYPE TEXT;
898+
SELECT pg_get_indexdef('concur_exprs_index_expr'::regclass);
899+
SELECT pg_get_indexdef('concur_exprs_index_pred'::regclass);
900+
SELECT pg_get_indexdef('concur_exprs_index_pred_2'::regclass);
901+
DROP TABLE concur_exprs_tab;
902+
875903
--
876904
-- REINDEX SCHEMA
877905
--

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