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pl_funcs.c
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/* ------------------------------------------------------------------------
*
* pl_funcs.c
* Utility C functions for stored procedures
*
* Copyright (c) 2015-2020, Postgres Professional
*
* ------------------------------------------------------------------------
*/
#include "compat/pg_compat.h"
#include "init.h"
#include "pathman.h"
#include "partition_creation.h"
#include "partition_filter.h"
#include "relation_info.h"
#include "xact_handling.h"
#include "utils.h"
#include "access/htup_details.h"
#if PG_VERSION_NUM >= 120000
#include "access/heapam.h"
#include "access/relscan.h"
#include "access/table.h"
#include "access/tableam.h"
#endif
#include "access/xact.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/pg_type.h"
#include "commands/tablespace.h"
#include "commands/trigger.h"
#include "executor/executor.h"
#include "executor/spi.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "utils/builtins.h"
#include "utils/inval.h"
#include "utils/snapmgr.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
#if PG_VERSION_NUM < 110000
#include "catalog/pg_inherits_fn.h"
#endif
/* Function declarations */
PG_FUNCTION_INFO_V1( get_number_of_partitions_pl );
PG_FUNCTION_INFO_V1( get_partition_key_type_pl );
PG_FUNCTION_INFO_V1( get_partition_cooked_key_pl );
PG_FUNCTION_INFO_V1( get_cached_partition_cooked_key_pl );
PG_FUNCTION_INFO_V1( get_parent_of_partition_pl );
PG_FUNCTION_INFO_V1( get_base_type_pl );
PG_FUNCTION_INFO_V1( get_tablespace_pl );
PG_FUNCTION_INFO_V1( show_cache_stats_internal );
PG_FUNCTION_INFO_V1( show_partition_list_internal );
PG_FUNCTION_INFO_V1( build_check_constraint_name );
PG_FUNCTION_INFO_V1( validate_relname );
PG_FUNCTION_INFO_V1( validate_expression );
PG_FUNCTION_INFO_V1( is_date_type );
PG_FUNCTION_INFO_V1( is_operator_supported );
PG_FUNCTION_INFO_V1( is_tuple_convertible );
PG_FUNCTION_INFO_V1( add_to_pathman_config );
PG_FUNCTION_INFO_V1( pathman_config_params_trigger_func );
PG_FUNCTION_INFO_V1( prevent_part_modification );
PG_FUNCTION_INFO_V1( prevent_data_modification );
PG_FUNCTION_INFO_V1( validate_part_callback_pl );
PG_FUNCTION_INFO_V1( invoke_on_partition_created_callback );
PG_FUNCTION_INFO_V1( check_security_policy );
PG_FUNCTION_INFO_V1( debug_capture );
PG_FUNCTION_INFO_V1( pathman_version );
/* User context for function show_partition_list_internal() */
typedef struct
{
Relation pathman_config;
#if PG_VERSION_NUM >= 120000
TableScanDesc pathman_config_scan;
#else
HeapScanDesc pathman_config_scan;
#endif
Snapshot snapshot;
PartRelationInfo *current_prel; /* selected PartRelationInfo */
Size child_number; /* child we're looking at */
SPITupleTable *tuptable; /* buffer for tuples */
} show_partition_list_cxt;
/* User context for function show_pathman_cache_stats_internal() */
typedef struct
{
MemoryContext pathman_contexts[PATHMAN_MCXT_COUNT];
HTAB *pathman_htables[PATHMAN_MCXT_COUNT];
int current_item;
} show_cache_stats_cxt;
/*
* ------------------------
* Various useful getters
* ------------------------
*/
/*
* Return parent of a specified partition.
*/
Datum
get_parent_of_partition_pl(PG_FUNCTION_ARGS)
{
Oid partition = PG_GETARG_OID(0),
parent = get_parent_of_partition(partition);
if (!OidIsValid(parent))
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("\"%s\" is not a partition",
get_rel_name_or_relid(partition))));
PG_RETURN_OID(parent);
}
/*
* Return partition key type.
*/
Datum
get_partition_key_type_pl(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
Oid typid;
PartRelationInfo *prel;
prel = get_pathman_relation_info(relid);
shout_if_prel_is_invalid(relid, prel, PT_ANY);
typid = prel->ev_type;
close_pathman_relation_info(prel);
PG_RETURN_OID(typid);
}
/*
* Return cooked partition key.
*/
Datum
get_partition_cooked_key_pl(PG_FUNCTION_ARGS)
{
/* Values extracted from PATHMAN_CONFIG */
Datum values[Natts_pathman_config];
bool isnull[Natts_pathman_config];
Oid relid = PG_GETARG_OID(0);
char *expr_cstr;
Node *expr;
char *cooked_cstr;
/* Check that table is registered in PATHMAN_CONFIG */
if (!pathman_config_contains_relation(relid, values, isnull, NULL, NULL))
elog(ERROR, "table \"%s\" is not partitioned",
get_rel_name_or_relid(relid));
expr_cstr = TextDatumGetCString(values[Anum_pathman_config_expr - 1]);
expr = cook_partitioning_expression(relid, expr_cstr, NULL);
cooked_cstr = nodeToString(expr);
pfree(expr_cstr);
pfree(expr);
PG_RETURN_DATUM(CStringGetTextDatum(cooked_cstr));
}
/*
* Return cached cooked partition key.
*
* Used in tests for invalidation.
*/
Datum
get_cached_partition_cooked_key_pl(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
PartRelationInfo *prel;
Datum res;
prel = get_pathman_relation_info(relid);
shout_if_prel_is_invalid(relid, prel, PT_ANY);
res = CStringGetTextDatum(nodeToString(prel->expr));
close_pathman_relation_info(prel);
PG_RETURN_DATUM(res);
}
/*
* Extract basic type of a domain.
*/
Datum
get_base_type_pl(PG_FUNCTION_ARGS)
{
PG_RETURN_OID(getBaseType(PG_GETARG_OID(0)));
}
/*
* Return tablespace name of a specified relation which must not be
* natively partitioned.
*/
Datum
get_tablespace_pl(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
Oid tablespace_id;
char *result;
tablespace_id = get_rel_tablespace(relid);
/* If tablespace id is InvalidOid then use the default tablespace */
if (!OidIsValid(tablespace_id))
{
tablespace_id = GetDefaultTablespaceCompat(get_rel_persistence(relid), false);
/* If tablespace is still invalid then use database's default */
if (!OidIsValid(tablespace_id))
tablespace_id = MyDatabaseTableSpace;
}
result = get_tablespace_name(tablespace_id);
PG_RETURN_TEXT_P(cstring_to_text(result));
}
/*
* ----------------------
* Common purpose VIEWs
* ----------------------
*/
/*
* List stats of all existing caches (memory contexts).
*/
Datum
show_cache_stats_internal(PG_FUNCTION_ARGS)
{
show_cache_stats_cxt *usercxt;
FuncCallContext *funccxt;
/*
* Initialize tuple descriptor & function call context.
*/
if (SRF_IS_FIRSTCALL())
{
TupleDesc tupdesc;
MemoryContext old_mcxt;
funccxt = SRF_FIRSTCALL_INIT();
if (!TopPathmanContext)
{
elog(ERROR, "pg_pathman's memory contexts are not initialized yet");
}
old_mcxt = MemoryContextSwitchTo(funccxt->multi_call_memory_ctx);
usercxt = (show_cache_stats_cxt *) palloc(sizeof(show_cache_stats_cxt));
usercxt->pathman_contexts[0] = TopPathmanContext;
usercxt->pathman_contexts[1] = PathmanParentsCacheContext;
usercxt->pathman_contexts[2] = PathmanStatusCacheContext;
usercxt->pathman_contexts[3] = PathmanBoundsCacheContext;
usercxt->pathman_htables[0] = NULL; /* no HTAB for this entry */
usercxt->pathman_htables[1] = parents_cache;
usercxt->pathman_htables[2] = status_cache;
usercxt->pathman_htables[3] = bounds_cache;
usercxt->current_item = 0;
/* Create tuple descriptor */
tupdesc = CreateTemplateTupleDescCompat(Natts_pathman_cache_stats, false);
TupleDescInitEntry(tupdesc, Anum_pathman_cs_context,
"context", TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, Anum_pathman_cs_size,
"size", INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, Anum_pathman_cs_used,
"used", INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, Anum_pathman_cs_entries,
"entries", INT8OID, -1, 0);
funccxt->tuple_desc = BlessTupleDesc(tupdesc);
funccxt->user_fctx = (void *) usercxt;
MemoryContextSwitchTo(old_mcxt);
}
funccxt = SRF_PERCALL_SETUP();
usercxt = (show_cache_stats_cxt *) funccxt->user_fctx;
if (usercxt->current_item < lengthof(usercxt->pathman_contexts))
{
HTAB *current_htab;
MemoryContext current_mcxt;
HeapTuple htup;
Datum values[Natts_pathman_cache_stats];
bool isnull[Natts_pathman_cache_stats] = { 0 };
#if PG_VERSION_NUM >= 90600
MemoryContextCounters mcxt_stats;
#endif
/* Select current memory context and hash table (cache) */
current_mcxt = usercxt->pathman_contexts[usercxt->current_item];
current_htab = usercxt->pathman_htables[usercxt->current_item];
values[Anum_pathman_cs_context - 1] =
CStringGetTextDatum(simplify_mcxt_name(current_mcxt));
/* We can't check stats of mcxt prior to 9.6 */
#if PG_VERSION_NUM >= 90600
/* Prepare context counters */
memset(&mcxt_stats, 0, sizeof(mcxt_stats));
/* NOTE: we do not consider child contexts if it's TopPathmanContext */
McxtStatsInternal(current_mcxt, 0,
(current_mcxt != TopPathmanContext),
&mcxt_stats);
values[Anum_pathman_cs_size - 1] =
Int64GetDatum(mcxt_stats.totalspace);
values[Anum_pathman_cs_used - 1] =
Int64GetDatum(mcxt_stats.totalspace - mcxt_stats.freespace);
#else
/* Set unsupported fields to NULL */
isnull[Anum_pathman_cs_size - 1] = true;
isnull[Anum_pathman_cs_used - 1] = true;
#endif
values[Anum_pathman_cs_entries - 1] =
Int64GetDatum(current_htab ?
hash_get_num_entries(current_htab) :
0);
/* Switch to next item */
usercxt->current_item++;
/* Form output tuple */
htup = heap_form_tuple(funccxt->tuple_desc, values, isnull);
SRF_RETURN_NEXT(funccxt, HeapTupleGetDatum(htup));
}
SRF_RETURN_DONE(funccxt);
}
/*
* List all existing partitions and their parents.
*
* In >=13 (bc8393cf277) struct SPITupleTable was changed
* (free removed and numvals added)
*/
Datum
show_partition_list_internal(PG_FUNCTION_ARGS)
{
show_partition_list_cxt *usercxt;
FuncCallContext *funccxt;
MemoryContext old_mcxt;
SPITupleTable *tuptable;
/* Initialize tuple descriptor & function call context */
if (SRF_IS_FIRSTCALL())
{
TupleDesc tupdesc;
MemoryContext tuptab_mcxt;
funccxt = SRF_FIRSTCALL_INIT();
old_mcxt = MemoryContextSwitchTo(funccxt->multi_call_memory_ctx);
usercxt = (show_partition_list_cxt *) palloc(sizeof(show_partition_list_cxt));
/* Open PATHMAN_CONFIG with latest snapshot available */
usercxt->pathman_config = heap_open_compat(get_pathman_config_relid(false),
AccessShareLock);
usercxt->snapshot = RegisterSnapshot(GetLatestSnapshot());
#if PG_VERSION_NUM >= 120000
usercxt->pathman_config_scan = table_beginscan(usercxt->pathman_config,
usercxt->snapshot, 0, NULL);
#else
usercxt->pathman_config_scan = heap_beginscan(usercxt->pathman_config,
usercxt->snapshot, 0, NULL);
#endif
usercxt->current_prel = NULL;
/* Create tuple descriptor */
tupdesc = CreateTemplateTupleDescCompat(Natts_pathman_partition_list, false);
TupleDescInitEntry(tupdesc, Anum_pathman_pl_parent,
"parent", REGCLASSOID, -1, 0);
TupleDescInitEntry(tupdesc, Anum_pathman_pl_partition,
"partition", REGCLASSOID, -1, 0);
TupleDescInitEntry(tupdesc, Anum_pathman_pl_parttype,
"parttype", INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, Anum_pathman_pl_partattr,
"expr", TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, Anum_pathman_pl_range_min,
"range_min", TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, Anum_pathman_pl_range_max,
"range_max", TEXTOID, -1, 0);
funccxt->tuple_desc = BlessTupleDesc(tupdesc);
funccxt->user_fctx = (void *) usercxt;
/* initialize tuple table context */
tuptab_mcxt = AllocSetContextCreate(CurrentMemoryContext,
"tuptable for pathman_partition_list",
ALLOCSET_DEFAULT_SIZES);
MemoryContextSwitchTo(tuptab_mcxt);
/* Initialize tuple table for partitions list, we use it as buffer */
tuptable = (SPITupleTable *) palloc0(sizeof(SPITupleTable));
usercxt->tuptable = tuptable;
tuptable->tuptabcxt = tuptab_mcxt;
/* Set up initial allocations */
#if PG_VERSION_NUM >= 130000
tuptable->alloced = PART_RELS_SIZE * CHILD_FACTOR;
tuptable->numvals = 0;
#else
tuptable->alloced = tuptable->free = PART_RELS_SIZE * CHILD_FACTOR;
#endif
tuptable->vals = (HeapTuple *) palloc(tuptable->alloced * sizeof(HeapTuple));
MemoryContextSwitchTo(old_mcxt);
/* Iterate through pathman cache */
for (;;)
{
HeapTuple htup;
Datum values[Natts_pathman_partition_list];
bool isnull[Natts_pathman_partition_list] = { 0 };
PartRelationInfo *prel;
/* Fetch next PartRelationInfo if needed */
if (usercxt->current_prel == NULL)
{
HeapTuple pathman_config_htup;
Datum parent_table;
bool parent_table_isnull;
Oid parent_table_oid;
pathman_config_htup = heap_getnext(usercxt->pathman_config_scan,
ForwardScanDirection);
if (!HeapTupleIsValid(pathman_config_htup))
break;
parent_table = heap_getattr(pathman_config_htup,
Anum_pathman_config_partrel,
RelationGetDescr(usercxt->pathman_config),
&parent_table_isnull);
Assert(parent_table_isnull == false);
parent_table_oid = DatumGetObjectId(parent_table);
usercxt->current_prel = get_pathman_relation_info(parent_table_oid);
if (usercxt->current_prel == NULL)
continue;
usercxt->child_number = 0;
}
/* Alias to 'usercxt->current_prel' */
prel = usercxt->current_prel;
/* If we've run out of partitions, switch to the next 'prel' */
if (usercxt->child_number >= PrelChildrenCount(prel))
{
/* Don't forget to close 'prel'! */
close_pathman_relation_info(prel);
usercxt->current_prel = NULL;
usercxt->child_number = 0;
continue;
}
/* Fill in common values */
values[Anum_pathman_pl_parent - 1] = PrelParentRelid(prel);
values[Anum_pathman_pl_parttype - 1] = prel->parttype;
values[Anum_pathman_pl_partattr - 1] = CStringGetTextDatum(prel->expr_cstr);
switch (prel->parttype)
{
case PT_HASH:
{
Oid *children = PrelGetChildrenArray(prel),
child_oid = children[usercxt->child_number];
values[Anum_pathman_pl_partition - 1] = child_oid;
isnull[Anum_pathman_pl_range_min - 1] = true;
isnull[Anum_pathman_pl_range_max - 1] = true;
}
break;
case PT_RANGE:
{
RangeEntry *re;
re = &PrelGetRangesArray(prel)[usercxt->child_number];
values[Anum_pathman_pl_partition - 1] = re->child_oid;
/* Lower bound text */
if (!IsInfinite(&re->min))
{
Datum rmin = CStringGetTextDatum(
BoundToCString(&re->min,
prel->ev_type));
values[Anum_pathman_pl_range_min - 1] = rmin;
}
else isnull[Anum_pathman_pl_range_min - 1] = true;
/* Upper bound text */
if (!IsInfinite(&re->max))
{
Datum rmax = CStringGetTextDatum(
BoundToCString(&re->max,
prel->ev_type));
values[Anum_pathman_pl_range_max - 1] = rmax;
}
else isnull[Anum_pathman_pl_range_max - 1] = true;
}
break;
default:
WrongPartType(prel->parttype);
}
/* Fill tuptable */
old_mcxt = MemoryContextSwitchTo(tuptable->tuptabcxt);
/* Form output tuple */
htup = heap_form_tuple(funccxt->tuple_desc, values, isnull);
#if PG_VERSION_NUM >= 130000
if (tuptable->numvals == tuptable->alloced)
#else
if (tuptable->free == 0)
#endif
{
/* Double the size of the pointer array */
#if PG_VERSION_NUM >= 130000
tuptable->alloced += tuptable->alloced;
#else
tuptable->free = tuptable->alloced;
tuptable->alloced += tuptable->free;
#endif
tuptable->vals = (HeapTuple *)
repalloc_huge(tuptable->vals,
tuptable->alloced * sizeof(HeapTuple));
}
#if PG_VERSION_NUM >= 130000
/* Add tuple to table and increase 'numvals' */
tuptable->vals[tuptable->numvals] = htup;
(tuptable->numvals)++;
#else
/* Add tuple to table and decrement 'free' */
tuptable->vals[tuptable->alloced - tuptable->free] = htup;
(tuptable->free)--;
#endif
MemoryContextSwitchTo(old_mcxt);
/* Switch to the next child */
usercxt->child_number++;
}
/* Clean resources */
#if PG_VERSION_NUM >= 120000
table_endscan(usercxt->pathman_config_scan);
#else
heap_endscan(usercxt->pathman_config_scan);
#endif
UnregisterSnapshot(usercxt->snapshot);
heap_close_compat(usercxt->pathman_config, AccessShareLock);
usercxt->child_number = 0;
}
funccxt = SRF_PERCALL_SETUP();
usercxt = (show_partition_list_cxt *) funccxt->user_fctx;
tuptable = usercxt->tuptable;
/* Iterate through used slots */
#if PG_VERSION_NUM >= 130000
if (usercxt->child_number < tuptable->numvals)
#else
if (usercxt->child_number < (tuptable->alloced - tuptable->free))
#endif
{
HeapTuple htup = usercxt->tuptable->vals[usercxt->child_number++];
SRF_RETURN_NEXT(funccxt, HeapTupleGetDatum(htup));
}
SRF_RETURN_DONE(funccxt);
}
/*
* --------
* Traits
* --------
*/
/*
* Check that relation exists.
* NOTE: we pass REGCLASS as text, hence the function's name.
*/
Datum
validate_relname(PG_FUNCTION_ARGS)
{
Oid relid;
/* We don't accept NULL */
if (PG_ARGISNULL(0))
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("relation should not be NULL"),
errdetail("function " CppAsString(validate_relname)
" received NULL argument")));
/* Fetch relation's Oid */
relid = PG_GETARG_OID(0);
if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(relid)))
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("relation \"%u\" does not exist", relid),
errdetail("triggered in function "
CppAsString(validate_relname))));
PG_RETURN_VOID();
}
/*
* Validate a partitioning expression.
* NOTE: We need this in range functions because
* we do many things before actual partitioning.
*/
Datum
validate_expression(PG_FUNCTION_ARGS)
{
Oid relid;
char *expression;
/* Fetch relation's Oid */
if (!PG_ARGISNULL(0))
{
relid = PG_GETARG_OID(0);
check_relation_oid(relid);
}
else ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("'relid' should not be NULL")));
/* Protect relation from concurrent drop */
LockRelationOid(relid, AccessShareLock);
if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(relid)))
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("relation \"%u\" does not exist", relid),
errdetail("triggered in function "
CppAsString(validate_expression))));
if (!PG_ARGISNULL(1))
{
expression = TextDatumGetCString(PG_GETARG_DATUM(1));
}
else ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("'expression' should not be NULL")));
/* Perform some checks */
cook_partitioning_expression(relid, expression, NULL);
UnlockRelationOid(relid, AccessShareLock);
PG_RETURN_VOID();
}
Datum
is_date_type(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(is_date_type_internal(PG_GETARG_OID(0)));
}
/*
* Bail out with ERROR if rel1 tuple can't be converted to rel2 tuple.
*/
Datum
is_tuple_convertible(PG_FUNCTION_ARGS)
{
Relation rel1,
rel2;
#if PG_VERSION_NUM >= 130000
AttrMap *map; /* we don't actually need it */
#else
void *map; /* we don't actually need it */
#endif
rel1 = heap_open_compat(PG_GETARG_OID(0), AccessShareLock);
rel2 = heap_open_compat(PG_GETARG_OID(1), AccessShareLock);
/* Try to build a conversion map */
#if PG_VERSION_NUM >= 160000 /* for commit ad86d159b6ab */
map = build_attrmap_by_name(RelationGetDescr(rel1),
RelationGetDescr(rel2), false);
#elif PG_VERSION_NUM >= 130000
map = build_attrmap_by_name(RelationGetDescr(rel1),
RelationGetDescr(rel2));
#else
map = convert_tuples_by_name_map(RelationGetDescr(rel1),
RelationGetDescr(rel2),
ERR_PART_DESC_CONVERT);
#endif
/* Now free map */
#if PG_VERSION_NUM >= 130000
free_attrmap(map);
#else
pfree(map);
#endif
heap_close_compat(rel1, AccessShareLock);
heap_close_compat(rel2, AccessShareLock);
/* still return true to avoid changing tests */
PG_RETURN_BOOL(true);
}
/*
* ------------------------
* Useful string builders
* ------------------------
*/
Datum
build_check_constraint_name(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
const char *result;
if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(relid)))
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("relation \"%u\" does not exist", relid)));
result = build_check_constraint_name_relid_internal(relid);
PG_RETURN_TEXT_P(cstring_to_text(quote_identifier(result)));
}
/*
* ------------------------
* Cache & config updates
* ------------------------
*/
/*
* Try to add previously partitioned table to PATHMAN_CONFIG.
*/
Datum
add_to_pathman_config(PG_FUNCTION_ARGS)
{
Oid relid;
char *expression;
PartType parttype;
Oid *children;
uint32 children_count;
Relation pathman_config;
Datum values[Natts_pathman_config_historic];
bool isnull[Natts_pathman_config_historic];
HeapTuple htup;
Oid expr_type;
volatile PathmanInitState init_state;
if (!IsPathmanReady())
elog(ERROR, "pg_pathman is disabled");
if (!PG_ARGISNULL(0))
{
relid = PG_GETARG_OID(0);
check_relation_oid(relid);
}
else ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("'parent_relid' should not be NULL")));
/* Protect data + definition from concurrent modification */
LockRelationOid(relid, AccessExclusiveLock);
/* Check that relation exists */
if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(relid)))
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("relation \"%u\" does not exist", relid)));
if (!PG_ARGISNULL(1))
{
expression = TextDatumGetCString(PG_GETARG_DATUM(1));
}
else ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("'expression' should not be NULL")));
/* Check current user's privileges */
if (!check_security_policy_internal(relid, GetUserId()))
{
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("only the owner or superuser can change "
"partitioning configuration of table \"%s\"",
get_rel_name_or_relid(relid))));
}
/* Select partitioning type */
switch (PG_NARGS())
{
/* HASH */
case 2:
{
parttype = PT_HASH;
values[Anum_pathman_config_range_interval - 1] = (Datum) 0;
isnull[Anum_pathman_config_range_interval - 1] = true;
}
break;
/* RANGE */
case 3:
{
parttype = PT_RANGE;
values[Anum_pathman_config_range_interval - 1] = PG_GETARG_DATUM(2);
isnull[Anum_pathman_config_range_interval - 1] = PG_ARGISNULL(2);
}
break;
default:
elog(ERROR, "error in function " CppAsString(add_to_pathman_config));
PG_RETURN_BOOL(false); /* keep compiler happy */
}
/* Parse and check expression */
cook_partitioning_expression(relid, expression, &expr_type);
/* Canonicalize user's expression (trim whitespaces etc) */
expression = canonicalize_partitioning_expression(relid, expression);
/* Check hash function for HASH partitioning */
if (parttype == PT_HASH)
{
TypeCacheEntry *tce = lookup_type_cache(expr_type, TYPECACHE_HASH_PROC);
if (!OidIsValid(tce->hash_proc))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("no hash function for partitioning expression")));
}
/*
* Initialize columns (partrel, attname, parttype, range_interval).
*/
values[Anum_pathman_config_partrel - 1] = ObjectIdGetDatum(relid);
isnull[Anum_pathman_config_partrel - 1] = false;
values[Anum_pathman_config_parttype - 1] = Int32GetDatum(parttype);
isnull[Anum_pathman_config_parttype - 1] = false;
values[Anum_pathman_config_expr - 1] = CStringGetTextDatum(expression);
isnull[Anum_pathman_config_expr - 1] = false;
/*
* In case of 1.5 update before 10e6c71 there are actually 5 attributes in
* pathman_config description (including cooked expression). To avoid
* potential problems we allocate 5th attribute and initialize it with null.
*/
values[Natts_pathman_config_historic - 1] = (Datum) 0;
isnull[Natts_pathman_config_historic - 1] = true;
/* Insert new row into PATHMAN_CONFIG */
pathman_config = heap_open_compat(get_pathman_config_relid(false), RowExclusiveLock);
htup = heap_form_tuple(RelationGetDescr(pathman_config), values, isnull);
CatalogTupleInsert(pathman_config, htup);
heap_close_compat(pathman_config, RowExclusiveLock);
/* Make changes visible */
CommandCounterIncrement();
/* Update caches only if this relation has children */
if (FCS_FOUND == find_inheritance_children_array(relid, NoLock, true,
&children_count,
&children))
{
pfree(children);
PG_TRY();
{
/* Some flags might change during refresh attempt */
save_pathman_init_state(&init_state);
/* Now try to create a PartRelationInfo */
has_pathman_relation_info(relid);
}
PG_CATCH();
{
/* We have to restore changed flags */
restore_pathman_init_state(&init_state);
/* Rethrow ERROR */
PG_RE_THROW();
}
PG_END_TRY();
}
/* Check if naming sequence exists */
if (parttype == PT_RANGE)
{
RangeVar *naming_seq_rv;
Oid naming_seq;
naming_seq_rv = makeRangeVar(get_namespace_name(get_rel_namespace(relid)),
build_sequence_name_relid_internal(relid),
-1);
naming_seq = RangeVarGetRelid(naming_seq_rv, AccessShareLock, true);
if (OidIsValid(naming_seq))
{
ObjectAddress parent,
sequence;
ObjectAddressSet(parent, RelationRelationId, relid);
ObjectAddressSet(sequence, RelationRelationId, naming_seq);
/* Now this naming sequence is a "part" of partitioned relation */
recordDependencyOn(&sequence, &parent, DEPENDENCY_NORMAL);
}
}
CacheInvalidateRelcacheByRelid(relid);
PG_RETURN_BOOL(true);
}
/*
* Invalidate relcache to refresh PartRelationInfo.
*/
Datum
pathman_config_params_trigger_func(PG_FUNCTION_ARGS)
{
TriggerData *trigdata = (TriggerData *) fcinfo->context;
Oid pathman_config_params;
Oid pathman_config;
Oid partrel;
Datum partrel_datum;
bool partrel_isnull;
/* Fetch Oid of PATHMAN_CONFIG_PARAMS */
pathman_config_params = get_pathman_config_params_relid(true);
pathman_config = get_pathman_config_relid(true);
/* Handle "pg_pathman.enabled = f" case */
if (!OidIsValid(pathman_config_params))
goto pathman_config_params_trigger_func_return;
/* Handle user calls */
if (!CALLED_AS_TRIGGER(fcinfo))
elog(ERROR, "this function should not be called directly");
/* Handle wrong fire mode */
if (!TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
elog(ERROR, "%s: must be fired for row",
trigdata->tg_trigger->tgname);