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partition_creation.c
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/*-------------------------------------------------------------------------
*
* partition_creation.c
* Various functions for partition creation.
*
* Copyright (c) 2016, Postgres Professional
*
*-------------------------------------------------------------------------
*/
#include "init.h"
#include "partition_creation.h"
#include "partition_filter.h"
#include "pathman.h"
#include "pathman_workers.h"
#include "compat/pg_compat.h"
#include "xact_handling.h"
#include "access/htup_details.h"
#include "access/reloptions.h"
#include "access/sysattr.h"
#include "access/xact.h"
#include "catalog/heap.h"
#include "catalog/pg_authid.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_trigger.h"
#include "catalog/pg_type.h"
#include "catalog/toasting.h"
#include "commands/defrem.h"
#include "commands/event_trigger.h"
#include "commands/sequence.h"
#include "commands/tablecmds.h"
#include "commands/tablespace.h"
#include "commands/trigger.h"
#include "executor/spi.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "parser/parse_func.h"
#include "parser/parse_utilcmd.h"
#include "parser/parse_relation.h"
#include "tcop/utility.h"
#include "utils/builtins.h"
#include "utils/datum.h"
#include "utils/fmgroids.h"
#include "utils/inval.h"
#include "utils/jsonb.h"
#include "utils/snapmgr.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
#if PG_VERSION_NUM >= 100000
#include "utils/regproc.h"
#endif
static Oid spawn_partitions_val(Oid parent_relid,
const Bound *range_bound_min,
const Bound *range_bound_max,
Oid range_bound_type,
Datum interval_binary,
Oid interval_type,
Datum value,
Oid value_type,
Oid collid);
static void create_single_partition_common(Oid parent_relid,
Oid partition_relid,
Constraint *check_constraint,
init_callback_params *callback_params,
List *trigger_columns);
static Oid create_single_partition_internal(Oid parent_relid,
RangeVar *partition_rv,
char *tablespace);
static char *choose_range_partition_name(Oid parent_relid, Oid parent_nsp);
static char *choose_hash_partition_name(Oid parent_relid, uint32 part_idx);
static ObjectAddress create_table_using_stmt(CreateStmt *create_stmt,
Oid relowner);
static void copy_foreign_keys(Oid parent_relid, Oid partition_oid);
static void copy_rel_options(Oid parent_relid, Oid partition_relid);
static void postprocess_child_table_and_atts(Oid parent_relid, Oid partition_relid);
static Oid text_to_regprocedure(text *proname_args);
static Constraint *make_constraint_common(char *name, Node *raw_expr);
static Value make_string_value_struct(char *str);
static Value make_int_value_struct(int int_val);
static Node *build_partitioning_expression(Oid parent_relid,
Oid *expr_type,
List **columns);
/*
* ---------------------------------------
* Public interface (partition creation)
* ---------------------------------------
*/
/* Create one RANGE partition [start_value, end_value) */
Oid
create_single_range_partition_internal(Oid parent_relid,
const Bound *start_value,
const Bound *end_value,
Oid value_type,
RangeVar *partition_rv,
char *tablespace)
{
Oid partition_relid;
Constraint *check_constr;
init_callback_params callback_params;
List *trigger_columns = NIL;
Node *expr;
Datum values[Natts_pathman_config];
bool isnull[Natts_pathman_config];
/*
* Sanity check. Probably needed only if some absurd init_callback
* decides to drop the table while we are creating partitions.
* It seems much better to use prel cache here, but this doesn't work
* because it regards tables with no partitions as not partitioned at all
* (build_pathman_relation_info returns NULL), and if I comment out that,
* tests fail for not immediately obvious reasons. Don't want to dig
* into this now.
*/
if (!pathman_config_contains_relation(parent_relid, values, isnull, NULL, NULL))
{
elog(ERROR, "Can't create range partition: relid %u doesn't exist or not partitioned", parent_relid);
}
/* Generate a name if asked to */
if (!partition_rv)
{
Oid parent_nsp = get_rel_namespace(parent_relid);
char *parent_nsp_name = get_namespace_name(parent_nsp);
char *partition_name;
partition_name = choose_range_partition_name(parent_relid, parent_nsp);
partition_rv = makeRangeVar(parent_nsp_name, partition_name, -1);
}
/* Check pathman config anld fill variables */
expr = build_partitioning_expression(parent_relid, NULL, &trigger_columns);
/* Create a partition & get 'partitioning expression' */
partition_relid = create_single_partition_internal(parent_relid,
partition_rv,
tablespace);
/* Build check constraint for RANGE partition */
check_constr = build_range_check_constraint(partition_relid,
expr,
start_value,
end_value,
value_type);
/* Cook args for init_callback */
MakeInitCallbackRangeParams(&callback_params,
DEFAULT_PATHMAN_INIT_CALLBACK,
parent_relid, partition_relid,
*start_value, *end_value, value_type);
/* Add constraint & execute init_callback */
create_single_partition_common(parent_relid,
partition_relid,
check_constr,
&callback_params,
trigger_columns);
/* Return the Oid */
return partition_relid;
}
/* Create one HASH partition */
Oid
create_single_hash_partition_internal(Oid parent_relid,
uint32 part_idx,
uint32 part_count,
RangeVar *partition_rv,
char *tablespace)
{
Oid partition_relid,
expr_type;
Constraint *check_constr;
init_callback_params callback_params;
List *trigger_columns = NIL;
Node *expr;
/* Generate a name if asked to */
if (!partition_rv)
{
Oid parent_nsp = get_rel_namespace(parent_relid);
char *parent_nsp_name = get_namespace_name(parent_nsp);
char *partition_name;
partition_name = choose_hash_partition_name(parent_relid, part_idx);
partition_rv = makeRangeVar(parent_nsp_name, partition_name, -1);
}
/* Create a partition & get 'partitionining expression' */
partition_relid = create_single_partition_internal(parent_relid,
partition_rv,
tablespace);
/* check pathman config and fill variables */
expr = build_partitioning_expression(parent_relid, &expr_type, &trigger_columns);
/* Build check constraint for HASH partition */
check_constr = build_hash_check_constraint(partition_relid,
expr,
part_idx,
part_count,
expr_type);
/* Cook args for init_callback */
MakeInitCallbackHashParams(&callback_params,
DEFAULT_PATHMAN_INIT_CALLBACK,
parent_relid, partition_relid);
/* Add constraint & execute init_callback */
create_single_partition_common(parent_relid,
partition_relid,
check_constr,
&callback_params,
trigger_columns);
/* Return the Oid */
return partition_relid;
}
/* Add constraint & execute init_callback */
void
create_single_partition_common(Oid parent_relid,
Oid partition_relid,
Constraint *check_constraint,
init_callback_params *callback_params,
List *trigger_columns)
{
Relation child_relation;
/* Open the relation and add new check constraint & fkeys */
child_relation = heap_open(partition_relid, AccessExclusiveLock);
AddRelationNewConstraints(child_relation, NIL,
list_make1(check_constraint),
false, true, true);
heap_close(child_relation, NoLock);
/* Make constraint visible */
CommandCounterIncrement();
/* Make trigger visible */
CommandCounterIncrement();
/* Finally invoke 'init_callback' */
invoke_part_callback(callback_params);
/* Make possible changes visible */
CommandCounterIncrement();
}
/*
* Create RANGE partitions (if needed) using either BGW or current backend.
*
* Returns Oid of the partition to store 'value'.
*/
Oid
create_partitions_for_value(Oid relid, Datum value, Oid value_type)
{
TransactionId rel_xmin;
Oid last_partition = InvalidOid;
/* Check that table is partitioned and fetch xmin */
if (pathman_config_contains_relation(relid, NULL, NULL, &rel_xmin, NULL))
{
/* Take default values */
bool spawn_using_bgw = DEFAULT_PATHMAN_SPAWN_USING_BGW,
enable_auto = DEFAULT_PATHMAN_AUTO;
/* Values to be extracted from PATHMAN_CONFIG_PARAMS */
Datum values[Natts_pathman_config_params];
bool isnull[Natts_pathman_config_params];
/* Try fetching options from PATHMAN_CONFIG_PARAMS */
if (read_pathman_params(relid, values, isnull))
{
enable_auto = values[Anum_pathman_config_params_auto - 1];
spawn_using_bgw = values[Anum_pathman_config_params_spawn_using_bgw - 1];
}
/* Emit ERROR if automatic partition creation is disabled */
if (!enable_auto || !IsAutoPartitionEnabled())
elog(ERROR, ERR_PART_ATTR_NO_PART, datum_to_cstring(value, value_type));
/*
* If table has been partitioned in some previous xact AND
* we don't hold any conflicting locks, run BGWorker.
*/
if (spawn_using_bgw &&
xact_object_is_visible(rel_xmin) &&
!xact_bgw_conflicting_lock_exists(relid))
{
elog(DEBUG2, "create_partitions(): chose BGWorker [%u]", MyProcPid);
last_partition = create_partitions_for_value_bg_worker(relid,
value,
value_type);
}
/* Else it'd be better for the current backend to create partitions */
else
{
elog(DEBUG2, "create_partitions(): chose backend [%u]", MyProcPid);
last_partition = create_partitions_for_value_internal(relid,
value,
value_type);
}
}
else
elog(ERROR, "table \"%s\" is not partitioned",
get_rel_name_or_relid(relid));
/* Check that 'last_partition' is valid */
if (last_partition == InvalidOid)
elog(ERROR, "could not create new partitions for relation \"%s\"",
get_rel_name_or_relid(relid));
/* Make changes visible */
AcceptInvalidationMessages();
return last_partition;
}
/*
* --------------------
* Partition creation
* --------------------
*/
/*
* Create partitions (if needed) and return Oid of the partition to store 'value'.
*
* NB: This function should not be called directly,
* use create_partitions_for_value() instead.
*/
Oid
create_partitions_for_value_internal(Oid relid, Datum value, Oid value_type)
{
Oid partid = InvalidOid; /* last created partition (or InvalidOid) */
Datum values[Natts_pathman_config];
bool isnull[Natts_pathman_config];
/* Get both PartRelationInfo & PATHMAN_CONFIG contents for this relation */
if (pathman_config_contains_relation(relid, values, isnull, NULL, NULL))
{
PartRelationInfo *prel;
LockAcquireResult lock_result; /* could we lock the parent? */
Oid base_bound_type; /* base type of prel->ev_type */
Oid base_value_type; /* base type of value_type */
/* Prevent modifications of partitioning scheme */
lock_result = xact_lock_rel(relid, ShareUpdateExclusiveLock, false);
/* Fetch PartRelationInfo by 'relid' */
prel = get_pathman_relation_info(relid);
shout_if_prel_is_invalid(relid, prel, PT_RANGE);
/* Fetch base types of prel->ev_type & value_type */
base_bound_type = getBaseType(prel->ev_type);
base_value_type = getBaseType(value_type);
/*
* Search for a suitable partition if we didn't hold it,
* since somebody might have just created it for us.
*
* If the table is locked, it means that we've
* already failed to find a suitable partition
* and called this function to do the job.
*/
Assert(lock_result != LOCKACQUIRE_NOT_AVAIL);
if (lock_result == LOCKACQUIRE_OK)
{
Oid *parts;
int nparts;
/* Search for matching partitions */
parts = find_partitions_for_value(value, value_type, prel, &nparts);
/* Shout if there's more than one */
if (nparts > 1)
elog(ERROR, ERR_PART_ATTR_MULTIPLE);
/* It seems that we got a partition! */
else if (nparts == 1)
{
/* Unlock the parent (we're not going to spawn) */
UnlockRelationOid(relid, ShareUpdateExclusiveLock);
/* Simply return the suitable partition */
partid = parts[0];
}
/* Don't forget to free */
pfree(parts);
}
/* Else spawn a new one (we hold a lock on the parent) */
if (partid == InvalidOid)
{
RangeEntry *ranges = PrelGetRangesArray(prel);
Bound bound_min, /* absolute MIN */
bound_max; /* absolute MAX */
Oid interval_type = InvalidOid;
Datum interval_binary, /* assigned 'width' of one partition */
interval_text;
/* Copy datums in order to protect them from cache invalidation */
bound_min = CopyBound(&ranges[0].min,
prel->ev_byval,
prel->ev_len);
bound_max = CopyBound(&ranges[PrelLastChild(prel)].max,
prel->ev_byval,
prel->ev_len);
/* Check if interval is set */
if (isnull[Anum_pathman_config_range_interval - 1])
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot spawn new partition for key '%s'",
datum_to_cstring(value, value_type)),
errdetail("default range interval is NULL")));
}
/* Retrieve interval as TEXT from tuple */
interval_text = values[Anum_pathman_config_range_interval - 1];
/* Convert interval to binary representation */
interval_binary = extract_binary_interval_from_text(interval_text,
base_bound_type,
&interval_type);
/* At last, spawn partitions to store the value */
partid = spawn_partitions_val(PrelParentRelid(prel),
&bound_min, &bound_max, base_bound_type,
interval_binary, interval_type,
value, base_value_type,
prel->ev_collid);
}
/* Don't forget to close 'prel'! */
close_pathman_relation_info(prel);
}
else
elog(ERROR, "table \"%s\" is not partitioned",
get_rel_name_or_relid(relid));
return partid;
}
/*
* Append\prepend partitions if there's no partition to store 'value'.
* NOTE: Used by create_partitions_for_value_internal().
*/
static Oid
spawn_partitions_val(Oid parent_relid, /* parent's Oid */
const Bound *range_bound_min, /* parent's MIN boundary */
const Bound *range_bound_max, /* parent's MAX boundary */
Oid range_bound_type, /* type of boundary's value */
Datum interval_binary, /* interval in binary form */
Oid interval_type, /* INTERVALOID or prel->ev_type */
Datum value, /* value to be INSERTed */
Oid value_type, /* type of value */
Oid collid) /* collation id */
{
bool should_append; /* append or prepend? */
Oid move_bound_op_func, /* operator's function */
move_bound_op_ret_type; /* operator's ret type */
FmgrInfo cmp_value_bound_finfo, /* exec 'value (>=|<) bound' */
move_bound_finfo; /* exec 'bound + interval' */
Datum cur_leading_bound, /* boundaries of a new partition */
cur_following_bound;
Bound value_bound = MakeBound(value);
Oid last_partition = InvalidOid;
fill_type_cmp_fmgr_info(&cmp_value_bound_finfo, value_type, range_bound_type);
/* Is it possible to append\prepend a partition? */
if (IsInfinite(range_bound_min) && IsInfinite(range_bound_max))
ereport(ERROR, (errmsg("cannot spawn a partition"),
errdetail("both bounds are infinite")));
/* value >= MAX_BOUNDARY */
else if (cmp_bounds(&cmp_value_bound_finfo, collid,
&value_bound, range_bound_max) >= 0)
{
should_append = true;
cur_leading_bound = BoundGetValue(range_bound_max);
}
/* value < MIN_BOUNDARY */
else if (cmp_bounds(&cmp_value_bound_finfo, collid,
&value_bound, range_bound_min) < 0)
{
should_append = false;
cur_leading_bound = BoundGetValue(range_bound_min);
}
/* There's a gap, halt and emit ERROR */
else ereport(ERROR, (errmsg("cannot spawn a partition"),
errdetail("there is a gap")));
/* Fetch operator's underlying function and ret type */
extract_op_func_and_ret_type(should_append ? "+" : "-",
range_bound_type,
interval_type,
&move_bound_op_func,
&move_bound_op_ret_type);
/* Perform casts if types don't match (e.g. date + interval = timestamp) */
if (move_bound_op_ret_type != range_bound_type)
{
/* Cast 'cur_leading_bound' to 'move_bound_op_ret_type' */
cur_leading_bound = perform_type_cast(cur_leading_bound,
range_bound_type,
move_bound_op_ret_type,
NULL); /* might emit ERROR */
/* Update 'range_bound_type' */
range_bound_type = move_bound_op_ret_type;
/* Fetch new comparison function */
fill_type_cmp_fmgr_info(&cmp_value_bound_finfo,
value_type,
range_bound_type);
/* Since type has changed, fetch another operator */
extract_op_func_and_ret_type(should_append ? "+" : "-",
range_bound_type,
interval_type,
&move_bound_op_func,
&move_bound_op_ret_type);
/* What, again? Don't want to deal with this nightmare */
if (move_bound_op_ret_type != range_bound_type)
elog(ERROR, "error in function " CppAsString(spawn_partitions_val));
}
/* Get operator's underlying function */
fmgr_info(move_bound_op_func, &move_bound_finfo);
/* Execute comparison function cmp(value, cur_leading_bound) */
while (should_append ?
check_ge(&cmp_value_bound_finfo, collid, value, cur_leading_bound) :
check_lt(&cmp_value_bound_finfo, collid, value, cur_leading_bound))
{
Bound bounds[2];
int rc;
bool isnull;
char *create_sql;
HeapTuple typeTuple;
char *typname;
Oid parent_nsp = get_rel_namespace(parent_relid);
char *parent_nsp_name = get_namespace_name(parent_nsp);
char *partition_name = choose_range_partition_name(parent_relid, parent_nsp);
/* Assign the 'following' boundary to current 'leading' value */
cur_following_bound = cur_leading_bound;
/* Move leading bound by interval (exec 'leading (+|-) INTERVAL') */
cur_leading_bound = FunctionCall2(&move_bound_finfo,
cur_leading_bound,
interval_binary);
bounds[0] = MakeBound(should_append ? cur_following_bound : cur_leading_bound);
bounds[1] = MakeBound(should_append ? cur_leading_bound : cur_following_bound);
/*
* Instead of directly calling create_single_range_partition_internal()
* we are going to call it through SPI, to make it possible for various
* DDL-replicating extensions to catch that call and do something about
* it. --sk
*/
/* Get typname of range_bound_type to perform cast */
typeTuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(range_bound_type));
Assert(HeapTupleIsValid(typeTuple));
typname = pstrdup(NameStr(((Form_pg_type) GETSTRUCT(typeTuple))->typname));
ReleaseSysCache(typeTuple);
/* Construct call to create_single_range_partition() */
create_sql = psprintf(
"select %s.create_single_range_partition('%s.%s', '%s'::%s, '%s'::%s, '%s.%s')",
get_namespace_name(get_pathman_schema()),
parent_nsp_name,
get_rel_name(parent_relid),
IsInfinite(&bounds[0]) ? "NULL" : datum_to_cstring(bounds[0].value, range_bound_type),
typname,
IsInfinite(&bounds[1]) ? "NULL" : datum_to_cstring(bounds[1].value, range_bound_type),
typname,
parent_nsp_name,
partition_name
);
/* ...and call it. */
SPI_connect();
PushActiveSnapshot(GetTransactionSnapshot());
rc = SPI_execute(create_sql, false, 0);
if (rc <= 0 || SPI_processed != 1)
elog(ERROR, "Failed to create range partition");
last_partition = DatumGetObjectId(SPI_getbinval(SPI_tuptable->vals[0],
SPI_tuptable->tupdesc,
1, &isnull));
Assert(!isnull);
SPI_finish();
PopActiveSnapshot();
#ifdef USE_ASSERT_CHECKING
elog(DEBUG2, "%s partition with following='%s' & leading='%s' [%u]",
(should_append ? "Appending" : "Prepending"),
DebugPrintDatum(cur_following_bound, range_bound_type),
DebugPrintDatum(cur_leading_bound, range_bound_type),
MyProcPid);
#endif
}
return last_partition;
}
/* Choose a good name for a RANGE partition */
static char *
choose_range_partition_name(Oid parent_relid, Oid parent_nsp)
{
Datum part_num;
Oid part_seq_relid;
char *part_seq_nspname,
*part_seq_relname;
RangeVar *part_seq_rv;
Oid save_userid;
int save_sec_context;
bool need_priv_escalation = !superuser(); /* we might be a SU */
char *relname;
int attempts_cnt = 1000;
/* Dispatch sequence and lock it using AccessShareLock */
part_seq_nspname = get_namespace_name(get_rel_namespace(parent_relid));
part_seq_relname = build_sequence_name_relid_internal(parent_relid);
part_seq_rv = makeRangeVar(part_seq_nspname, part_seq_relname, -1);
part_seq_relid = RangeVarGetRelid(part_seq_rv, AccessShareLock, true);
/* Could not find part number generating sequence */
if (!OidIsValid(part_seq_relid))
elog(ERROR, "auto naming sequence \"%s\" does not exist", part_seq_relname);
pfree(part_seq_nspname);
pfree(part_seq_relname);
pfree(part_seq_rv);
/* Do we have to escalate privileges? */
if (need_priv_escalation)
{
/* Get current user's Oid and security context */
GetUserIdAndSecContext(&save_userid, &save_sec_context);
/* Become superuser in order to bypass sequence ACL checks */
SetUserIdAndSecContext(BOOTSTRAP_SUPERUSERID,
save_sec_context | SECURITY_LOCAL_USERID_CHANGE);
}
/* Generate unique name */
while (true)
{
/* Get next integer for partition name */
part_num = DirectFunctionCall1(nextval_oid, ObjectIdGetDatum(part_seq_relid));
relname = psprintf("%s_" UINT64_FORMAT,
get_rel_name(parent_relid),
(uint64) DatumGetInt64(part_num)); /* can't use UInt64 on 9.5 */
/*
* If we found a unique name or attempts number exceeds some reasonable
* value then we quit
*
* XXX Should we throw an exception if max attempts number is reached?
*/
if (get_relname_relid(relname, parent_nsp) == InvalidOid || attempts_cnt < 0)
break;
pfree(relname);
attempts_cnt--;
}
/* Restore user's privileges */
if (need_priv_escalation)
SetUserIdAndSecContext(save_userid, save_sec_context);
return relname;
}
/* Choose a good name for a HASH partition */
static char *
choose_hash_partition_name(Oid parent_relid, uint32 part_idx)
{
return psprintf("%s_%u", get_rel_name(parent_relid), part_idx);
}
/* Create a partition-like table (no constraints yet) */
static Oid
create_single_partition_internal(Oid parent_relid,
RangeVar *partition_rv,
char *tablespace)
{
/* Value to be returned */
Oid partition_relid = InvalidOid; /* safety */
/* Parent's namespace and name */
Oid parent_nsp;
char *parent_name,
*parent_nsp_name;
/* Elements of the "CREATE TABLE" query tree */
RangeVar *parent_rv;
TableLikeClause like_clause;
CreateStmt create_stmt;
List *create_stmts;
ListCell *lc;
/* Current user and security context */
Oid save_userid;
int save_sec_context;
bool need_priv_escalation = !superuser(); /* we might be a SU */
/* Lock parent and check if it exists */
LockRelationOid(parent_relid, ShareUpdateExclusiveLock);
if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(parent_relid)))
elog(ERROR, "relation %u does not exist", parent_relid);
/* Check that table is registered in PATHMAN_CONFIG */
if (!pathman_config_contains_relation(parent_relid, NULL, NULL, NULL, NULL))
elog(ERROR, "table \"%s\" is not partitioned",
get_rel_name_or_relid(parent_relid));
/* Do we have to escalate privileges? */
if (need_priv_escalation)
{
/* Get current user's Oid and security context */
GetUserIdAndSecContext(&save_userid, &save_sec_context);
/* Check that user's allowed to spawn partitions */
if (ACLCHECK_OK != pg_class_aclcheck(parent_relid, save_userid,
ACL_SPAWN_PARTITIONS))
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied for parent relation \"%s\"",
get_rel_name_or_relid(parent_relid)),
errdetail("user is not allowed to create new partitions"),
errhint("consider granting INSERT privilege")));
/* Become superuser in order to bypass various ACL checks */
SetUserIdAndSecContext(BOOTSTRAP_SUPERUSERID,
save_sec_context | SECURITY_LOCAL_USERID_CHANGE);
}
/* Cache parent's namespace and name */
parent_name = get_rel_name(parent_relid);
parent_nsp = get_rel_namespace(parent_relid);
parent_nsp_name = get_namespace_name(parent_nsp);
/* Make up parent's RangeVar */
parent_rv = makeRangeVar(parent_nsp_name, parent_name, -1);
/* If no 'tablespace' is provided, get parent's tablespace */
if (!tablespace)
tablespace = get_tablespace_name(get_rel_tablespace(parent_relid));
/* Initialize TableLikeClause structure */
NodeSetTag(&like_clause, T_TableLikeClause);
like_clause.relation = copyObject(parent_rv);
like_clause.options = CREATE_TABLE_LIKE_DEFAULTS |
CREATE_TABLE_LIKE_INDEXES |
CREATE_TABLE_LIKE_STORAGE;
/* Initialize CreateStmt structure */
NodeSetTag(&create_stmt, T_CreateStmt);
create_stmt.relation = copyObject(partition_rv);
create_stmt.tableElts = list_make1(copyObject(&like_clause));
create_stmt.inhRelations = list_make1(copyObject(parent_rv));
create_stmt.ofTypename = NULL;
create_stmt.constraints = NIL;
create_stmt.options = NIL;
create_stmt.oncommit = ONCOMMIT_NOOP;
create_stmt.tablespacename = tablespace;
create_stmt.if_not_exists = false;
#if PG_VERSION_NUM >= 100000
create_stmt.partbound = NULL;
create_stmt.partspec = NULL;
#endif
#if defined(PGPRO_EE) && PG_VERSION_NUM < 100000
create_stmt.partition_info = NULL;
#endif
/* Obtain the sequence of Stmts to create partition and link it to parent */
create_stmts = transformCreateStmt(&create_stmt, NULL);
/* Create the partition and all required relations */
foreach (lc, create_stmts)
{
Node *cur_stmt;
/* Fetch current CreateStmt */
cur_stmt = (Node *) lfirst(lc);
if (IsA(cur_stmt, CreateStmt))
{
Oid child_relowner;
/* Partition should have the same owner as the parent */
child_relowner = get_rel_owner(parent_relid);
/* Create a partition and save its Oid */
partition_relid = create_table_using_stmt((CreateStmt *) cur_stmt,
child_relowner).objectId;
/* Copy attributes to partition */
copy_rel_options(parent_relid, partition_relid);
/* Copy FOREIGN KEYS of the parent table */
copy_foreign_keys(parent_relid, partition_relid);
/* Make changes visible */
CommandCounterIncrement();
/* Copy ACL privileges of the parent table and set "attislocal" */
postprocess_child_table_and_atts(parent_relid, partition_relid);
}
else if (IsA(cur_stmt, CreateForeignTableStmt))
{
elog(ERROR, "FDW partition creation is not implemented yet");
}
else
{
/*
* Recurse for anything else. Note the recursive
* call will stash the objects so created into our
* event trigger context.
*/
ProcessUtilityCompat(cur_stmt,
"we have to provide a query string",
PROCESS_UTILITY_SUBCOMMAND,
NULL,
None_Receiver,
NULL);
}
/* Update config one more time */
CommandCounterIncrement();
}
/* Restore user's privileges */
if (need_priv_escalation)
SetUserIdAndSecContext(save_userid, save_sec_context);
return partition_relid;
}
/* Create a new table using cooked CreateStmt */
static ObjectAddress
create_table_using_stmt(CreateStmt *create_stmt, Oid relowner)
{
ObjectAddress table_addr;
Datum toast_options;
static char *validnsps[] = HEAP_RELOPT_NAMESPACES;
int guc_level;
/* Create new GUC level... */
guc_level = NewGUCNestLevel();
/* ... and set client_min_messages = warning */
(void) set_config_option(CppAsString(client_min_messages), "WARNING",
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_SAVE, true, 0, false);
/* Create new partition owned by parent's posessor */
table_addr = DefineRelationCompat(create_stmt, RELKIND_RELATION, relowner,
NULL);
/* Save data about a simple DDL command that was just executed */
EventTriggerCollectSimpleCommand(table_addr,
InvalidObjectAddress,
(Node *) create_stmt);
/*
* Let NewRelationCreateToastTable decide if this
* one needs a secondary relation too.
*/
CommandCounterIncrement();
/* Parse and validate reloptions for the toast table */
toast_options = transformRelOptions((Datum) 0, create_stmt->options,
"toast", validnsps, true, false);
/* Parse options for a new toast table */
(void) heap_reloptions(RELKIND_TOASTVALUE, toast_options, true);
/* Now create the toast table if needed */
NewRelationCreateToastTable(table_addr.objectId, toast_options);
/* Restore original GUC values */
AtEOXact_GUC(true, guc_level);
/* Return the address */
return table_addr;
}
/* Copy ACL privileges of parent table and set "attislocal" = true */
static void
postprocess_child_table_and_atts(Oid parent_relid, Oid partition_relid)
{
Relation parent_rel,
partition_rel,
pg_class_rel,
pg_attribute_rel;
TupleDesc pg_class_desc,
pg_attribute_desc;
List *translated_vars;
HeapTuple htup;
ScanKeyData skey[2];
SysScanDesc scan;
Datum acl_datum;
bool acl_null;
Snapshot snapshot;
/* Both parent & partition have already been locked */
parent_rel = heap_open(parent_relid, NoLock);
partition_rel = heap_open(partition_relid, NoLock);
make_inh_translation_list(parent_rel, partition_rel, 0, &translated_vars);
heap_close(parent_rel, NoLock);
heap_close(partition_rel, NoLock);
/* Open catalog's relations */
pg_class_rel = heap_open(RelationRelationId, RowExclusiveLock);
pg_attribute_rel = heap_open(AttributeRelationId, RowExclusiveLock);
/* Get most recent snapshot */
snapshot = RegisterSnapshot(GetLatestSnapshot());
pg_class_desc = RelationGetDescr(pg_class_rel);
pg_attribute_desc = RelationGetDescr(pg_attribute_rel);
htup = SearchSysCache1(RELOID, ObjectIdGetDatum(parent_relid));
if (!HeapTupleIsValid(htup))
elog(ERROR, "cache lookup failed for relation %u", parent_relid);
/* Get parent's ACL */
acl_datum = heap_getattr(htup, Anum_pg_class_relacl, pg_class_desc, &acl_null);
/* Copy datum if it's not NULL */
if (!acl_null)
{
Form_pg_attribute acl_column;
acl_column = TupleDescAttr(pg_class_desc, Anum_pg_class_relacl - 1);
acl_datum = datumCopy(acl_datum, acl_column->attbyval, acl_column->attlen);
}
/* Release 'htup' */
ReleaseSysCache(htup);
/* Search for 'partition_relid' */
ScanKeyInit(&skey[0],
ObjectIdAttributeNumber,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(partition_relid));
scan = systable_beginscan(pg_class_rel, ClassOidIndexId,
true, snapshot, 1, skey);
/* There should be exactly one tuple (our child) */
if (HeapTupleIsValid(htup = systable_getnext(scan)))
{
ItemPointerData iptr;
Datum values[Natts_pg_class] = { (Datum) 0 };