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relation_info.c
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/* ------------------------------------------------------------------------
*
* relation_info.c
* Data structures describing partitioned relations
*
* Copyright (c) 2016-2020, Postgres Professional
*
* ------------------------------------------------------------------------
*/
#include "compat/pg_compat.h"
#include "relation_info.h"
#include "init.h"
#include "utils.h"
#include "xact_handling.h"
#include "access/htup_details.h"
#if PG_VERSION_NUM >= 120000
#include "access/genam.h"
#include "access/table.h"
#endif
#include "access/xact.h"
#include "catalog/catalog.h"
#include "catalog/indexing.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_inherits.h"
#include "catalog/pg_type.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#if PG_VERSION_NUM >= 120000
#include "optimizer/optimizer.h"
#else
#include "optimizer/clauses.h"
#include "optimizer/var.h"
#endif
#include "parser/analyze.h"
#include "parser/parser.h"
#include "storage/lmgr.h"
#include "tcop/tcopprot.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/hsearch.h"
#include "utils/inval.h"
#include "utils/memutils.h"
#include "utils/resowner.h"
#include "utils/ruleutils.h"
#include "utils/syscache.h"
#include "utils/lsyscache.h"
#include "utils/typcache.h"
#if PG_VERSION_NUM < 90600
#include "optimizer/planmain.h"
#endif
#if PG_VERSION_NUM < 110000 && PG_VERSION_NUM >= 90600
#include "catalog/pg_constraint_fn.h"
#endif
/* Error messages for partitioning expression */
#define PARSE_PART_EXPR_ERROR "failed to parse partitioning expression \"%s\""
#define COOK_PART_EXPR_ERROR "failed to analyze partitioning expression \"%s\""
#ifdef USE_RELINFO_LEAK_TRACKER
#undef get_pathman_relation_info
#undef close_pathman_relation_info
const char *prel_resowner_function = NULL;
int prel_resowner_line = 0;
#define LeakTrackerAdd(prel) \
do { \
MemoryContext leak_tracker_add_old_mcxt = MemoryContextSwitchTo((prel)->mcxt); \
(prel)->owners = \
list_append_unique( \
(prel)->owners, \
list_make2(makeString((char *) prel_resowner_function), \
makeInteger(prel_resowner_line))); \
MemoryContextSwitchTo(leak_tracker_add_old_mcxt); \
\
(prel)->access_total++; \
} while (0)
#define LeakTrackerPrint(prel) \
do { \
ListCell *leak_tracker_print_lc; \
foreach (leak_tracker_print_lc, (prel)->owners) \
{ \
char *fun = strVal(linitial(lfirst(leak_tracker_print_lc))); \
int line = intVal(lsecond(lfirst(leak_tracker_print_lc))); \
elog(WARNING, "PartRelationInfo referenced in %s:%d", fun, line); \
} \
} while (0)
#define LeakTrackerFree(prel) \
do { \
ListCell *leak_tracker_free_lc; \
foreach (leak_tracker_free_lc, (prel)->owners) \
{ \
list_free_deep(lfirst(leak_tracker_free_lc)); \
} \
list_free((prel)->owners); \
(prel)->owners = NIL; \
} while (0)
#else
#define LeakTrackerAdd(prel)
#define LeakTrackerPrint(prel)
#define LeakTrackerFree(prel)
#endif
/* Comparison function info */
typedef struct cmp_func_info
{
FmgrInfo flinfo;
Oid collid;
} cmp_func_info;
typedef struct prel_resowner_info
{
ResourceOwner owner;
List *prels;
} prel_resowner_info;
/*
* For pg_pathman.enable_bounds_cache GUC.
*/
bool pg_pathman_enable_bounds_cache = true;
/*
* We delay all invalidation jobs received in relcache hook.
*/
static bool delayed_shutdown = false; /* pathman was dropped */
/*
* PartRelationInfo is controlled by ResourceOwner;
* resowner -> List of controlled PartRelationInfos by this ResourceOwner
*/
HTAB *prel_resowner = NULL;
/* Handy wrappers for Oids */
#define bsearch_oid(key, array, array_size) \
bsearch((const void *) &(key), (array), (array_size), sizeof(Oid), oid_cmp)
static PartRelationInfo *build_pathman_relation_info(Oid relid, Datum *values);
static void free_pathman_relation_info(PartRelationInfo *prel);
static void invalidate_psin_entries_using_relid(Oid relid);
static void invalidate_psin_entry(PartStatusInfo *psin);
static PartRelationInfo *resowner_prel_add(PartRelationInfo *prel);
static PartRelationInfo *resowner_prel_del(PartRelationInfo *prel);
static void resonwner_prel_callback(ResourceReleasePhase phase,
bool isCommit,
bool isTopLevel,
void *arg);
static void fill_prel_with_partitions(PartRelationInfo *prel,
const Oid *partitions,
const uint32 parts_count);
static void fill_pbin_with_bounds(PartBoundInfo *pbin,
const PartRelationInfo *prel,
const Expr *constraint_expr);
static int cmp_range_entries(const void *p1, const void *p2, void *arg);
static void forget_bounds_of_partition(Oid partition);
static bool query_contains_subqueries(Node *node, void *context);
void
init_relation_info_static_data(void)
{
DefineCustomBoolVariable("pg_pathman.enable_bounds_cache",
"Make updates of partition dispatch cache faster",
NULL,
&pg_pathman_enable_bounds_cache,
true,
PGC_USERSET,
0,
NULL,
NULL,
NULL);
}
/*
* Status cache routines.
*/
/* Invalidate PartStatusInfo for 'relid' */
void
forget_status_of_relation(Oid relid)
{
PartStatusInfo *psin;
PartParentInfo *ppar;
/* Find status cache entry for this relation */
psin = pathman_cache_search_relid(status_cache,
relid, HASH_FIND,
NULL);
if (psin)
invalidate_psin_entry(psin);
/*
* Find parent of this relation.
*
* We don't want to use get_parent_of_partition()
* since it relies upon the syscache.
*/
ppar = pathman_cache_search_relid(parents_cache,
relid, HASH_FIND,
NULL);
/* Invalidate parent directly */
if (ppar)
{
/* Find status cache entry for parent */
psin = pathman_cache_search_relid(status_cache,
ppar->parent_relid, HASH_FIND,
NULL);
if (psin)
invalidate_psin_entry(psin);
}
/* Otherwise, look through all entries */
else invalidate_psin_entries_using_relid(relid);
}
/* Invalidate all PartStatusInfo entries */
void
invalidate_status_cache(void)
{
invalidate_psin_entries_using_relid(InvalidOid);
}
/* Invalidate PartStatusInfo entry referencing 'relid' */
static void
invalidate_psin_entries_using_relid(Oid relid)
{
HASH_SEQ_STATUS status;
PartStatusInfo *psin;
hash_seq_init(&status, status_cache);
while ((psin = (PartStatusInfo *) hash_seq_search(&status)) != NULL)
{
if (!OidIsValid(relid) ||
psin->relid == relid ||
(psin->prel && PrelHasPartition(psin->prel, relid)))
{
/* Perform invalidation */
invalidate_psin_entry(psin);
/* Exit if exact match */
if (OidIsValid(relid))
{
hash_seq_term(&status);
break;
}
}
}
}
/* Invalidate single PartStatusInfo entry */
static void
invalidate_psin_entry(PartStatusInfo *psin)
{
#ifdef USE_RELINFO_LOGGING
elog(DEBUG2, "invalidation message for relation %u [%u]",
psin->relid, MyProcPid);
#endif
if (psin->prel)
{
if (PrelReferenceCount(psin->prel) > 0)
{
/* Mark entry as outdated and detach it */
PrelIsFresh(psin->prel) = false;
}
else
{
free_pathman_relation_info(psin->prel);
}
}
(void) pathman_cache_search_relid(status_cache,
psin->relid,
HASH_REMOVE,
NULL);
}
/*
* Dispatch cache routines.
*/
/* Close PartRelationInfo entry */
void
close_pathman_relation_info(PartRelationInfo *prel)
{
Assert(prel);
(void) resowner_prel_del(prel);
}
/* Check if relation is partitioned by pg_pathman */
bool
has_pathman_relation_info(Oid relid)
{
PartRelationInfo *prel;
if ((prel = get_pathman_relation_info(relid)) != NULL)
{
close_pathman_relation_info(prel);
return true;
}
return false;
}
/* Get PartRelationInfo from local cache */
PartRelationInfo *
get_pathman_relation_info(Oid relid)
{
PartStatusInfo *psin;
if (!IsPathmanReady())
elog(ERROR, "pg_pathman is disabled");
/* Should always be called in transaction */
Assert(IsTransactionState());
/* We don't create entries for catalog */
if (relid < FirstNormalObjectId)
return NULL;
/* Do we know anything about this relation? */
psin = pathman_cache_search_relid(status_cache,
relid, HASH_FIND,
NULL);
if (!psin)
{
PartRelationInfo *prel = NULL;
ItemPointerData iptr;
Datum values[Natts_pathman_config_historic];
bool isnull[Natts_pathman_config_historic];
bool found;
/*
* Check if PATHMAN_CONFIG table contains this relation and
* build a partitioned table cache entry (might emit ERROR).
*/
if (pathman_config_contains_relation(relid, values, isnull, NULL, &iptr))
prel = build_pathman_relation_info(relid, values);
/* Create a new entry for this relation */
psin = pathman_cache_search_relid(status_cache,
relid, HASH_ENTER,
&found);
Assert(!found); /* it shouldn't just appear out of thin air */
/* Cache fresh entry */
psin->prel = prel;
}
/* Check invariants */
Assert(!psin->prel || PrelIsFresh(psin->prel));
#ifdef USE_RELINFO_LOGGING
elog(DEBUG2,
"fetching %s record for parent %u [%u]",
(psin->prel ? "live" : "NULL"), relid, MyProcPid);
#endif
return resowner_prel_add(psin->prel);
}
/* Build a new PartRelationInfo for partitioned relation */
static PartRelationInfo *
build_pathman_relation_info(Oid relid, Datum *values)
{
const LOCKMODE lockmode = AccessShareLock;
MemoryContext prel_mcxt;
PartRelationInfo *prel;
AssertTemporaryContext();
/* Lock parent table */
LockRelationOid(relid, lockmode);
/* Check if parent exists */
if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(relid)))
{
/* Nope, it doesn't, remove this entry and exit */
UnlockRelationOid(relid, lockmode);
return NULL; /* exit */
}
/* Create a new memory context to store expression tree etc */
prel_mcxt = AllocSetContextCreate(PathmanParentsCacheContext,
"build_pathman_relation_info",
ALLOCSET_SMALL_SIZES);
/* Create a new PartRelationInfo */
prel = MemoryContextAllocZero(prel_mcxt, sizeof(PartRelationInfo));
prel->relid = relid;
prel->refcount = 0;
prel->fresh = true;
prel->mcxt = prel_mcxt;
/* Memory leak and cache protection */
PG_TRY();
{
MemoryContext old_mcxt;
const TypeCacheEntry *typcache;
Datum param_values[Natts_pathman_config_params];
bool param_isnull[Natts_pathman_config_params];
Oid *prel_children;
uint32 prel_children_count = 0,
i;
/* Make both arrays point to NULL */
prel->children = NULL;
prel->ranges = NULL;
/* Set partitioning type */
prel->parttype = DatumGetPartType(values[Anum_pathman_config_parttype - 1]);
/* Switch to persistent memory context */
old_mcxt = MemoryContextSwitchTo(prel->mcxt);
/* Build partitioning expression tree */
prel->expr_cstr = TextDatumGetCString(values[Anum_pathman_config_expr - 1]);
prel->expr = cook_partitioning_expression(relid, prel->expr_cstr, NULL);
fix_opfuncids(prel->expr);
/* Extract Vars and varattnos of partitioning expression */
prel->expr_vars = NIL;
prel->expr_atts = NULL;
prel->expr_vars = pull_var_clause_compat(prel->expr, 0, 0);
pull_varattnos((Node *) prel->expr_vars, PART_EXPR_VARNO, &prel->expr_atts);
MemoryContextSwitchTo(old_mcxt);
/* First, fetch type of partitioning expression */
prel->ev_type = exprType(prel->expr);
prel->ev_typmod = exprTypmod(prel->expr);
prel->ev_collid = exprCollation(prel->expr);
/* Fetch HASH & CMP fuctions and other stuff from type cache */
typcache = lookup_type_cache(prel->ev_type,
TYPECACHE_CMP_PROC | TYPECACHE_HASH_PROC);
prel->ev_byval = typcache->typbyval;
prel->ev_len = typcache->typlen;
prel->ev_align = typcache->typalign;
prel->cmp_proc = typcache->cmp_proc;
prel->hash_proc = typcache->hash_proc;
/* Try searching for children */
(void) find_inheritance_children_array(relid, lockmode, false,
&prel_children_count,
&prel_children);
/* Fill 'prel' with partition info, raise ERROR if anything is wrong */
fill_prel_with_partitions(prel, prel_children, prel_children_count);
/* Unlock the parent */
UnlockRelationOid(relid, lockmode);
/* Now it's time to take care of children */
for (i = 0; i < prel_children_count; i++)
{
/* Cache this child */
cache_parent_of_partition(prel_children[i], relid);
/* Unlock this child */
UnlockRelationOid(prel_children[i], lockmode);
}
if (prel_children)
pfree(prel_children);
/* Read additional parameters ('enable_parent' at the moment) */
if (read_pathman_params(relid, param_values, param_isnull))
{
prel->enable_parent =
param_values[Anum_pathman_config_params_enable_parent - 1];
}
/* Else set default values if they cannot be found */
else
{
prel->enable_parent = DEFAULT_PATHMAN_ENABLE_PARENT;
}
}
PG_CATCH();
{
/*
* If we managed to create some children but failed later, bounds
* cache now might have obsolete data for something that probably is
* not a partitioned table at all. Remove it.
*/
if (!IsPathmanInitialized())
/*
* ... unless failure was so hard that caches were already destoyed,
* i.e. extension disabled
*/
PG_RE_THROW();
if (prel->children != NULL)
{
uint32 i;
for (i = 0; i < PrelChildrenCount(prel); i++)
{
Oid child;
/*
* We rely on children and ranges array allocated with 0s, not
* random data
*/
if (prel->parttype == PT_HASH)
child = prel->children[i];
else
{
Assert(prel->parttype == PT_RANGE);
child = prel->ranges[i].child_oid;
}
forget_bounds_of_partition(child);
}
}
/* Free this entry */
free_pathman_relation_info(prel);
/* Rethrow ERROR further */
PG_RE_THROW();
}
PG_END_TRY();
/* Free trivial entries */
if (PrelChildrenCount(prel) == 0)
{
free_pathman_relation_info(prel);
prel = NULL;
}
return prel;
}
/* Free PartRelationInfo struct safely */
static void
free_pathman_relation_info(PartRelationInfo *prel)
{
MemoryContextDelete(prel->mcxt);
}
static PartRelationInfo *
resowner_prel_add(PartRelationInfo *prel)
{
if (!prel_resowner)
{
HASHCTL ctl;
memset(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(ResourceOwner);
ctl.entrysize = sizeof(prel_resowner_info);
ctl.hcxt = TopPathmanContext;
prel_resowner = hash_create("prel resowner",
PART_RELS_SIZE, &ctl,
HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
RegisterResourceReleaseCallback(resonwner_prel_callback, NULL);
}
if (prel)
{
ResourceOwner resowner = CurrentResourceOwner;
prel_resowner_info *info;
bool found;
MemoryContext old_mcxt;
info = hash_search(prel_resowner,
(void *) &resowner,
HASH_ENTER,
&found);
if (!found)
info->prels = NIL;
/* Register this 'prel' */
old_mcxt = MemoryContextSwitchTo(TopPathmanContext);
info->prels = lappend(info->prels, prel);
MemoryContextSwitchTo(old_mcxt);
/* Save current caller (function:line) */
LeakTrackerAdd(prel);
/* Finally, increment refcount */
PrelReferenceCount(prel) += 1;
}
return prel;
}
static PartRelationInfo *
resowner_prel_del(PartRelationInfo *prel)
{
/* Must be active! */
Assert(prel_resowner);
if (prel)
{
ResourceOwner resowner = CurrentResourceOwner;
prel_resowner_info *info;
info = hash_search(prel_resowner,
(void *) &resowner,
HASH_FIND,
NULL);
if (info)
{
/* Check that 'prel' is registered! */
Assert(list_member_ptr(info->prels, prel));
/* Remove it from list */
info->prels = list_delete_ptr(info->prels, prel);
}
/* Check that refcount is valid */
Assert(PrelReferenceCount(prel) > 0);
/* Decrease refcount */
PrelReferenceCount(prel) -= 1;
/* Free list of owners */
if (PrelReferenceCount(prel) == 0)
{
LeakTrackerFree(prel);
}
/* Free this entry if it's time */
if (PrelReferenceCount(prel) == 0 && !PrelIsFresh(prel))
{
free_pathman_relation_info(prel);
}
}
return prel;
}
static void
resonwner_prel_callback(ResourceReleasePhase phase,
bool isCommit,
bool isTopLevel,
void *arg)
{
ResourceOwner resowner = CurrentResourceOwner;
prel_resowner_info *info;
if (prel_resowner)
{
ListCell *lc;
info = hash_search(prel_resowner,
(void *) &resowner,
HASH_FIND,
NULL);
if (info)
{
foreach (lc, info->prels)
{
PartRelationInfo *prel = lfirst(lc);
if (isCommit)
{
/* Print verbose list of *possible* owners */
LeakTrackerPrint(prel);
elog(WARNING,
"cache reference leak: PartRelationInfo(%d) has count %d",
PrelParentRelid(prel), PrelReferenceCount(prel));
}
/* Check that refcount is valid */
Assert(PrelReferenceCount(prel) > 0);
/* Decrease refcount */
PrelReferenceCount(prel) -= 1;
/* Free list of owners */
LeakTrackerFree(prel);
/* Free this entry if it's time */
if (PrelReferenceCount(prel) == 0 && !PrelIsFresh(prel))
{
free_pathman_relation_info(prel);
}
}
list_free(info->prels);
hash_search(prel_resowner,
(void *) &resowner,
HASH_REMOVE,
NULL);
}
}
}
/* Fill PartRelationInfo with partition-related info */
static void
fill_prel_with_partitions(PartRelationInfo *prel,
const Oid *partitions,
const uint32 parts_count)
{
/* Allocate array if partitioning type matches 'prel' (or "ANY") */
#define AllocZeroArray(part_type, context, elem_num, elem_type) \
( \
((part_type) == PT_ANY || (part_type) == prel->parttype) ? \
MemoryContextAllocZero((context), (elem_num) * sizeof(elem_type)) : \
NULL \
)
uint32 i;
MemoryContext temp_mcxt, /* reference temporary mcxt */
old_mcxt; /* reference current mcxt */
AssertTemporaryContext();
/* Allocate memory for 'prel->children' & 'prel->ranges' (if needed) */
prel->children = AllocZeroArray(PT_ANY, prel->mcxt, parts_count, Oid);
prel->ranges = AllocZeroArray(PT_RANGE, prel->mcxt, parts_count, RangeEntry);
/* Set number of children */
PrelChildrenCount(prel) = parts_count;
/* Create temporary memory context for loop */
temp_mcxt = AllocSetContextCreate(CurrentMemoryContext,
CppAsString(fill_prel_with_partitions),
ALLOCSET_SMALL_SIZES);
/* Initialize bounds of partitions */
for (i = 0; i < PrelChildrenCount(prel); i++)
{
PartBoundInfo *pbin;
/* Clear all previous allocations */
MemoryContextReset(temp_mcxt);
/* Switch to the temporary memory context */
old_mcxt = MemoryContextSwitchTo(temp_mcxt);
{
/* Fetch constraint's expression tree */
pbin = get_bounds_of_partition(partitions[i], prel);
}
MemoryContextSwitchTo(old_mcxt);
/* Copy bounds from bound cache */
switch (prel->parttype)
{
case PT_HASH:
/*
* This might be the case if hash part was dropped, and thus
* children array alloc'ed smaller than needed, but parts
* bound cache still keeps entries with high indexes.
*/
if (pbin->part_idx >= PrelChildrenCount(prel))
{
/* purged caches will destoy prel, save oid for reporting */
Oid parent_relid = PrelParentRelid(prel);
DisablePathman(); /* disable pg_pathman since config is broken */
ereport(ERROR, (errmsg("pg_pathman's cache for relation %d "
"has not been properly initialized. "
"Looks like one of hash partitions was dropped.",
parent_relid),
errhint(INIT_ERROR_HINT)));
}
prel->children[pbin->part_idx] = pbin->child_relid;
break;
case PT_RANGE:
{
/* Copy child's Oid */
prel->ranges[i].child_oid = pbin->child_relid;
/* Copy all min & max Datums to the persistent mcxt */
old_mcxt = MemoryContextSwitchTo(prel->mcxt);
{
prel->ranges[i].min = CopyBound(&pbin->range_min,
prel->ev_byval,
prel->ev_len);
prel->ranges[i].max = CopyBound(&pbin->range_max,
prel->ev_byval,
prel->ev_len);
}
MemoryContextSwitchTo(old_mcxt);
}
break;
default:
{
DisablePathman(); /* disable pg_pathman since config is broken */
WrongPartType(prel->parttype);
}
break;
}
}
/* Drop temporary memory context */
MemoryContextDelete(temp_mcxt);
/* Finalize 'prel' for a RANGE-partitioned table */
if (prel->parttype == PT_RANGE)
{
qsort_range_entries(PrelGetRangesArray(prel),
PrelChildrenCount(prel),
prel);
/* Initialize 'prel->children' array */
for (i = 0; i < PrelChildrenCount(prel); i++)
prel->children[i] = prel->ranges[i].child_oid;
}
/* Check that each partition Oid has been assigned properly */
if (prel->parttype == PT_HASH)
for (i = 0; i < PrelChildrenCount(prel); i++)
{
if (!OidIsValid(prel->children[i]))
{
DisablePathman(); /* disable pg_pathman since config is broken */
ereport(ERROR, (errmsg("pg_pathman's cache for relation \"%s\" "
"has not been properly initialized",
get_rel_name_or_relid(PrelParentRelid(prel))),
errhint(INIT_ERROR_HINT)));
}
}
}
/* qsort() comparison function for RangeEntries */
static int
cmp_range_entries(const void *p1, const void *p2, void *arg)
{
const RangeEntry *v1 = (const RangeEntry *) p1;
const RangeEntry *v2 = (const RangeEntry *) p2;
cmp_func_info *info = (cmp_func_info *) arg;
return cmp_bounds(&info->flinfo, info->collid, &v1->min, &v2->min);
}
void
qsort_range_entries(RangeEntry *entries, int nentries,
const PartRelationInfo *prel)
{
cmp_func_info cmp_info;
/* Prepare function info */
fmgr_info(prel->cmp_proc, &cmp_info.flinfo);
cmp_info.collid = prel->ev_collid;
/* Sort partitions by RangeEntry->min asc */
qsort_arg(entries, nentries,
sizeof(RangeEntry),
cmp_range_entries,
(void *) &cmp_info);
}
/*
* Common PartRelationInfo checks. Emit ERROR if anything is wrong.
*/
void
shout_if_prel_is_invalid(const Oid parent_oid,
const PartRelationInfo *prel,
const PartType expected_part_type)
{
if (!prel)
elog(ERROR, "relation \"%s\" has no partitions",
get_rel_name_or_relid(parent_oid));
/* Check partitioning type unless it's "ANY" */
if (expected_part_type != PT_ANY &&
expected_part_type != prel->parttype)
{
char *expected_str;
switch (expected_part_type)
{
case PT_HASH:
expected_str = "HASH";
break;
case PT_RANGE:
expected_str = "RANGE";
break;
default:
WrongPartType(expected_part_type);
expected_str = NULL; /* keep compiler happy */
}
elog(ERROR, "relation \"%s\" is not partitioned by %s",
get_rel_name_or_relid(parent_oid),
expected_str);
}
}
/*
* Remap partitioning expression columns for tuple source relation.
* This is a simplified version of functions that return TupleConversionMap.
* It should be faster if expression uses a few fields of relation.
*/
#if PG_VERSION_NUM >= 130000
AttrMap *
PrelExpressionAttributesMap(const PartRelationInfo *prel,
TupleDesc source_tupdesc)
#else
AttrNumber *
PrelExpressionAttributesMap(const PartRelationInfo *prel,
TupleDesc source_tupdesc,
int *map_length)
#endif
{
Oid parent_relid = PrelParentRelid(prel);
int source_natts = source_tupdesc->natts,
expr_natts = 0;
#if PG_VERSION_NUM >= 130000
AttrMap *result;
#else
AttrNumber *result;
#endif
AttrNumber i;
bool is_trivial = true;
/* Get largest attribute number used in expression */
i = -1;
while ((i = bms_next_member(prel->expr_atts, i)) >= 0)
expr_natts = i;
#if PG_VERSION_NUM >= 130000
result = make_attrmap(expr_natts);
#else
/* Allocate array for map */
result = (AttrNumber *) palloc0(expr_natts * sizeof(AttrNumber));
#endif
/* Find a match for each attribute */
i = -1;
while ((i = bms_next_member(prel->expr_atts, i)) >= 0)
{
AttrNumber attnum = i + FirstLowInvalidHeapAttributeNumber;
char *attname = get_attname_compat(parent_relid, attnum);
int j;
Assert(attnum <= expr_natts);
for (j = 0; j < source_natts; j++)
{
Form_pg_attribute att = TupleDescAttr(source_tupdesc, j);
if (att->attisdropped)
continue; /* attrMap[attnum - 1] is already 0 */
if (strcmp(NameStr(att->attname), attname) == 0)
{
#if PG_VERSION_NUM >= 130000
result->attnums[attnum - 1] = (AttrNumber) (j + 1);
#else
result[attnum - 1] = (AttrNumber) (j + 1);
#endif
break;
}
}
#if PG_VERSION_NUM >= 130000
if (result->attnums[attnum - 1] == 0)
#else
if (result[attnum - 1] == 0)
#endif
elog(ERROR, "cannot find column \"%s\" in child relation", attname);
#if PG_VERSION_NUM >= 130000
if (result->attnums[attnum - 1] != attnum)
#else
if (result[attnum - 1] != attnum)