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hooks.c
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/* ------------------------------------------------------------------------
*
* hooks.c
* definitions of rel_pathlist and join_pathlist hooks
*
* Copyright (c) 2016-2020, Postgres Professional
* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* ------------------------------------------------------------------------
*/
#include "compat/pg_compat.h"
#include "compat/rowmarks_fix.h"
#if PG_VERSION_NUM >= 120000
#include "access/table.h"
#endif
#include "declarative.h"
#include "hooks.h"
#include "init.h"
#include "partition_filter.h"
#include "partition_overseer.h"
#include "partition_router.h"
#include "pathman_workers.h"
#include "planner_tree_modification.h"
#include "runtime_append.h"
#include "runtime_merge_append.h"
#include "utility_stmt_hooking.h"
#include "utils.h"
#include "xact_handling.h"
#include "access/transam.h"
#include "access/xact.h"
#include "catalog/pg_authid.h"
#include "miscadmin.h"
#include "optimizer/cost.h"
#include "optimizer/prep.h"
#include "optimizer/restrictinfo.h"
#include "rewrite/rewriteManip.h"
#include "utils/lsyscache.h"
#include "utils/typcache.h"
#include "utils/snapmgr.h"
#ifdef USE_ASSERT_CHECKING
#define USE_RELCACHE_LOGGING
#endif
/* Borrowed from joinpath.c */
#define PATH_PARAM_BY_REL(path, rel) \
((path)->param_info && bms_overlap(PATH_REQ_OUTER(path), (rel)->relids))
static inline bool
allow_star_schema_join(PlannerInfo *root,
Path *outer_path,
Path *inner_path)
{
Relids innerparams = PATH_REQ_OUTER(inner_path);
Relids outerrelids = outer_path->parent->relids;
/*
* It's a star-schema case if the outer rel provides some but not all of
* the inner rel's parameterization.
*/
return (bms_overlap(innerparams, outerrelids) &&
bms_nonempty_difference(innerparams, outerrelids));
}
set_join_pathlist_hook_type pathman_set_join_pathlist_next = NULL;
set_rel_pathlist_hook_type pathman_set_rel_pathlist_hook_next = NULL;
planner_hook_type pathman_planner_hook_next = NULL;
post_parse_analyze_hook_type pathman_post_parse_analyze_hook_next = NULL;
shmem_startup_hook_type pathman_shmem_startup_hook_next = NULL;
ProcessUtility_hook_type pathman_process_utility_hook_next = NULL;
ExecutorStart_hook_type pathman_executor_start_hook_prev = NULL;
/* Take care of joins */
void
pathman_join_pathlist_hook(PlannerInfo *root,
RelOptInfo *joinrel,
RelOptInfo *outerrel,
RelOptInfo *innerrel,
JoinType jointype,
JoinPathExtraData *extra)
{
JoinCostWorkspace workspace;
JoinType saved_jointype = jointype;
RangeTblEntry *inner_rte = root->simple_rte_array[innerrel->relid];
PartRelationInfo *inner_prel;
List *joinclauses,
*otherclauses;
WalkerContext context;
double paramsel;
Node *part_expr;
ListCell *lc;
/* Call hooks set by other extensions */
if (pathman_set_join_pathlist_next)
pathman_set_join_pathlist_next(root, joinrel, outerrel,
innerrel, jointype, extra);
/* Check that both pg_pathman & RuntimeAppend nodes are enabled */
if (!IsPathmanReady() || !pg_pathman_enable_runtimeappend)
return;
/* We should only consider base inner relations */
if (innerrel->reloptkind != RELOPT_BASEREL)
return;
/* We shouldn't process tables with active children */
if (inner_rte->inh)
return;
/* We shouldn't process functions etc */
if (inner_rte->rtekind != RTE_RELATION)
return;
/* We don't support these join types (since inner will be parameterized) */
if (jointype == JOIN_FULL ||
jointype == JOIN_RIGHT ||
jointype == JOIN_UNIQUE_INNER)
return;
/* Skip if inner table is not allowed to act as parent (e.g. FROM ONLY) */
if (PARENTHOOD_DISALLOWED == get_rel_parenthood_status(inner_rte))
return;
/* Proceed iff relation 'innerrel' is partitioned */
if ((inner_prel = get_pathman_relation_info(inner_rte->relid)) == NULL)
return;
/*
* Check if query is:
* 1) UPDATE part_table SET = .. FROM part_table.
* 2) DELETE FROM part_table USING part_table.
*
* Either outerrel or innerrel may be a result relation.
*/
if ((root->parse->resultRelation == outerrel->relid ||
root->parse->resultRelation == innerrel->relid) &&
(root->parse->commandType == CMD_UPDATE ||
root->parse->commandType == CMD_DELETE))
{
int rti = -1,
count = 0;
/* Inner relation must be partitioned */
Assert(inner_prel);
/* Check each base rel of outer relation */
while ((rti = bms_next_member(outerrel->relids, rti)) >= 0)
{
Oid outer_baserel = root->simple_rte_array[rti]->relid;
/* Is it partitioned? */
if (has_pathman_relation_info(outer_baserel))
count++;
}
if (count > 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("DELETE and UPDATE queries with a join "
"of partitioned tables are not supported")));
}
/* Replace virtual join types with a real one */
if (jointype == JOIN_UNIQUE_OUTER || jointype == JOIN_UNIQUE_INNER)
jointype = JOIN_INNER;
/* Extract join clauses which will separate partitions */
if (IS_OUTER_JOIN(extra->sjinfo->jointype))
{
extract_actual_join_clauses_compat(extra->restrictlist,
joinrel->relids,
&joinclauses,
&otherclauses);
}
else
{
/* We can treat all clauses alike for an inner join */
joinclauses = extract_actual_clauses(extra->restrictlist, false);
otherclauses = NIL;
}
/* Make copy of partitioning expression and fix Var's varno attributes */
part_expr = PrelExpressionForRelid(inner_prel, innerrel->relid);
paramsel = 1.0;
foreach (lc, joinclauses)
{
WrapperNode *wrap;
InitWalkerContext(&context, part_expr, inner_prel, NULL);
wrap = walk_expr_tree((Expr *) lfirst(lc), &context);
paramsel *= wrap->paramsel;
}
foreach (lc, innerrel->pathlist)
{
AppendPath *cur_inner_path = (AppendPath *) lfirst(lc);
Path *outer,
*inner;
NestPath *nest_path; /* NestLoop we're creating */
ParamPathInfo *ppi; /* parameterization info */
Relids required_nestloop,
required_inner;
List *filtered_joinclauses = NIL,
*saved_ppi_list,
*pathkeys;
ListCell *rinfo_lc;
if (!IsA(cur_inner_path, AppendPath))
continue;
/* Select cheapest path for outerrel */
outer = outerrel->cheapest_total_path;
/* We cannot use an outer path that is parameterized by the inner rel */
if (PATH_PARAM_BY_REL(outer, innerrel))
continue;
/* Wrap 'outer' in unique path if needed */
if (saved_jointype == JOIN_UNIQUE_OUTER)
{
outer = (Path *) create_unique_path(root, outerrel,
outer, extra->sjinfo);
Assert(outer);
}
/* Make inner path depend on outerrel's columns */
required_inner = bms_union(PATH_REQ_OUTER((Path *) cur_inner_path),
outerrel->relids);
/* Preserve existing ppis built by get_appendrel_parampathinfo() */
saved_ppi_list = innerrel->ppilist;
/* Get the ParamPathInfo for a parameterized path */
innerrel->ppilist = NIL;
ppi = get_baserel_parampathinfo(root, innerrel, required_inner);
innerrel->ppilist = saved_ppi_list;
/* Skip ppi->ppi_clauses don't reference partition attribute */
if (!(ppi && get_partitioning_clauses(ppi->ppi_clauses,
inner_prel,
innerrel->relid)))
continue;
/* Try building RuntimeAppend path, skip if it's not possible */
inner = create_runtime_append_path(root, cur_inner_path, ppi, paramsel);
if (!inner)
continue;
required_nestloop = calc_nestloop_required_outer_compat(outer, inner);
/*
* Check to see if proposed path is still parameterized, and reject if the
* parameterization wouldn't be sensible --- unless allow_star_schema_join
* says to allow it anyway. Also, we must reject if have_dangerous_phv
* doesn't like the look of it, which could only happen if the nestloop is
* still parameterized.
*/
if (required_nestloop &&
((!bms_overlap(required_nestloop, extra->param_source_rels) &&
!allow_star_schema_join(root, outer, inner)) ||
have_dangerous_phv(root, outer->parent->relids, required_inner)))
continue;
initial_cost_nestloop_compat(root, &workspace, jointype, outer, inner, extra);
pathkeys = build_join_pathkeys(root, joinrel, jointype, outer->pathkeys);
/* Discard all clauses that are to be evaluated by 'inner' */
foreach (rinfo_lc, extra->restrictlist)
{
RestrictInfo *rinfo = (RestrictInfo *) lfirst(rinfo_lc);
Assert(IsA(rinfo, RestrictInfo));
if (!join_clause_is_movable_to(rinfo, inner->parent))
filtered_joinclauses = lappend(filtered_joinclauses, rinfo);
}
nest_path =
create_nestloop_path_compat(root, joinrel, jointype,
&workspace, extra, outer, inner,
filtered_joinclauses, pathkeys,
calc_nestloop_required_outer_compat(outer, inner));
/*
* NOTE: Override 'rows' value produced by standard estimator.
* Currently we use get_parameterized_joinrel_size() since
* it works just fine, but this might change some day.
*/
#if PG_VERSION_NUM >= 150000 /* for commit 18fea737b5e4 */
nest_path->jpath.path.rows =
#else
nest_path->path.rows =
#endif
get_parameterized_joinrel_size_compat(root, joinrel,
outer, inner,
extra->sjinfo,
filtered_joinclauses);
/* Finally we can add the new NestLoop path */
add_path(joinrel, (Path *) nest_path);
}
/* Don't forget to close 'inner_prel'! */
close_pathman_relation_info(inner_prel);
}
/* Cope with simple relations */
void
pathman_rel_pathlist_hook(PlannerInfo *root,
RelOptInfo *rel,
Index rti,
RangeTblEntry *rte)
{
PartRelationInfo *prel;
Relation parent_rel; /* parent's relation (heap) */
PlanRowMark *parent_rowmark; /* parent's rowmark */
Oid *children; /* selected children oids */
List *ranges, /* a list of IndexRanges */
*wrappers; /* a list of WrapperNodes */
PathKey *pathkeyAsc = NULL,
*pathkeyDesc = NULL;
double paramsel = 1.0; /* default part selectivity */
WalkerContext context;
Node *part_expr;
List *part_clauses;
ListCell *lc;
int irange_len,
i;
/* Invoke original hook if needed */
if (pathman_set_rel_pathlist_hook_next)
pathman_set_rel_pathlist_hook_next(root, rel, rti, rte);
/* Make sure that pg_pathman is ready */
if (!IsPathmanReady())
return;
/* We shouldn't process tables with active children */
if (rte->inh)
return;
/*
* Skip if it's a result relation (UPDATE | DELETE | INSERT),
* or not a (partitioned) physical relation at all.
*/
if (rte->rtekind != RTE_RELATION ||
rte->relkind != RELKIND_RELATION ||
root->parse->resultRelation == rti)
return;
#ifdef LEGACY_ROWMARKS_95
/* It's better to exit, since RowMarks might be broken */
if (root->parse->commandType != CMD_SELECT &&
root->parse->commandType != CMD_INSERT)
return;
/* SELECT FOR SHARE/UPDATE is not handled by above check */
foreach(lc, root->rowMarks)
{
PlanRowMark *rc = (PlanRowMark *) lfirst(lc);
if (rc->rti == rti)
return;
}
#endif
/* Skip if this table is not allowed to act as parent (e.g. FROM ONLY) */
if (PARENTHOOD_DISALLOWED == get_rel_parenthood_status(rte))
return;
/* Proceed iff relation 'rel' is partitioned */
if ((prel = get_pathman_relation_info(rte->relid)) == NULL)
return;
/*
* Check that this child is not the parent table itself.
* This is exactly how standard inheritance works.
*
* Helps with queries like this one:
*
* UPDATE test.tmp t SET value = 2
* WHERE t.id IN (SELECT id
* FROM test.tmp2 t2
* WHERE id = t.id);
*
* or unions, multilevel partitioning, etc.
*
* Since we disable optimizations on 9.5, we
* have to skip parent table that has already
* been expanded by standard inheritance.
*/
if (rel->reloptkind == RELOPT_OTHER_MEMBER_REL)
{
foreach (lc, root->append_rel_list)
{
AppendRelInfo *appinfo = (AppendRelInfo *) lfirst(lc);
Oid child_oid,
parent_oid;
/* Is it actually the same table? */
child_oid = root->simple_rte_array[appinfo->child_relid]->relid;
parent_oid = root->simple_rte_array[appinfo->parent_relid]->relid;
/*
* If there's an 'appinfo', it means that somebody
* (PG?) has already processed this partitioned table
* and added its children to the plan.
*/
if (appinfo->child_relid == rti &&
OidIsValid(appinfo->parent_reloid))
{
if (child_oid == parent_oid)
goto cleanup;
else if (!has_pathman_relation_info(parent_oid))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("could not expand partitioned table \"%s\"",
get_rel_name(child_oid)),
errhint("Do not use inheritance and pg_pathman partitions together")));
}
}
}
/* Make copy of partitioning expression and fix Var's varno attributes */
part_expr = PrelExpressionForRelid(prel, rti);
/* Get partitioning-related clauses (do this before append_child_relation()) */
part_clauses = get_partitioning_clauses(rel->baserestrictinfo, prel, rti);
if (prel->parttype == PT_RANGE)
{
/*
* Get pathkeys for ascending and descending sort by partitioned column.
*/
List *pathkeys;
TypeCacheEntry *tce;
/* Determine operator type */
tce = lookup_type_cache(prel->ev_type, TYPECACHE_LT_OPR | TYPECACHE_GT_OPR);
/* Make pathkeys */
pathkeys = build_expression_pathkey(root, (Expr *) part_expr, NULL,
tce->lt_opr, NULL, false);
if (pathkeys)
pathkeyAsc = (PathKey *) linitial(pathkeys);
pathkeys = build_expression_pathkey(root, (Expr *) part_expr, NULL,
tce->gt_opr, NULL, false);
if (pathkeys)
pathkeyDesc = (PathKey *) linitial(pathkeys);
}
children = PrelGetChildrenArray(prel);
ranges = list_make1_irange_full(prel, IR_COMPLETE);
/* Make wrappers over restrictions and collect final rangeset */
InitWalkerContext(&context, part_expr, prel, NULL);
wrappers = NIL;
foreach(lc, rel->baserestrictinfo)
{
WrapperNode *wrap;
RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
wrap = walk_expr_tree(rinfo->clause, &context);
paramsel *= wrap->paramsel;
wrappers = lappend(wrappers, wrap);
ranges = irange_list_intersection(ranges, wrap->rangeset);
}
/* Get number of selected partitions */
irange_len = irange_list_length(ranges);
if (prel->enable_parent)
irange_len++; /* also add parent */
/* Expand simple_rte_array and simple_rel_array */
if (irange_len > 0)
{
int current_len = root->simple_rel_array_size,
new_len = current_len + irange_len;
/* Expand simple_rel_array */
root->simple_rel_array = (RelOptInfo **)
repalloc(root->simple_rel_array,
new_len * sizeof(RelOptInfo *));
memset((void *) &root->simple_rel_array[current_len], 0,
irange_len * sizeof(RelOptInfo *));
/* Expand simple_rte_array */
root->simple_rte_array = (RangeTblEntry **)
repalloc(root->simple_rte_array,
new_len * sizeof(RangeTblEntry *));
memset((void *) &root->simple_rte_array[current_len], 0,
irange_len * sizeof(RangeTblEntry *));
#if PG_VERSION_NUM >= 110000
/*
* Make sure append_rel_array is wide enough; if it hasn't been
* allocated previously, care to zero out [0; current_len) part.
*/
if (root->append_rel_array == NULL)
root->append_rel_array = (AppendRelInfo **)
palloc0(current_len * sizeof(AppendRelInfo *));
root->append_rel_array = (AppendRelInfo **)
repalloc(root->append_rel_array,
new_len * sizeof(AppendRelInfo *));
memset((void *) &root->append_rel_array[current_len], 0,
irange_len * sizeof(AppendRelInfo *));
#endif
/* Don't forget to update array size! */
root->simple_rel_array_size = new_len;
}
/* Parent has already been locked by rewriter */
parent_rel = heap_open_compat(rte->relid, NoLock);
parent_rowmark = get_plan_rowmark(root->rowMarks, rti);
/* Add parent if asked to */
if (prel->enable_parent)
append_child_relation(root, parent_rel, parent_rowmark,
rti, 0, rte->relid, NULL);
/* Iterate all indexes in rangeset and append child relations */
foreach(lc, ranges)
{
IndexRange irange = lfirst_irange(lc);
for (i = irange_lower(irange); i <= irange_upper(irange); i++)
append_child_relation(root, parent_rel, parent_rowmark,
rti, i, children[i], wrappers);
}
/* Now close parent relation */
heap_close_compat(parent_rel, NoLock);
/* Clear path list and make it point to NIL */
list_free_deep(rel->pathlist);
rel->pathlist = NIL;
#if PG_VERSION_NUM >= 90600
/* Clear old partial path list */
list_free(rel->partial_pathlist);
rel->partial_pathlist = NIL;
#endif
/* Generate new paths using the rels we've just added */
set_append_rel_pathlist(root, rel, rti, pathkeyAsc, pathkeyDesc);
set_append_rel_size_compat(root, rel, rti);
/* consider gathering partial paths for the parent appendrel */
generate_gather_paths_compat(root, rel);
/* Skip if both custom nodes are disabled */
if (!(pg_pathman_enable_runtimeappend ||
pg_pathman_enable_runtime_merge_append))
goto cleanup;
/* Skip if there's no PARAMs in partitioning-related clauses */
if (!clause_contains_params((Node *) part_clauses))
goto cleanup;
/* Generate Runtime[Merge]Append paths if needed */
foreach (lc, rel->pathlist)
{
AppendPath *cur_path = (AppendPath *) lfirst(lc);
Relids inner_required = PATH_REQ_OUTER((Path *) cur_path);
Path *inner_path = NULL;
ParamPathInfo *ppi;
/* Skip if rel contains some join-related stuff or path type mismatched */
if (!(IsA(cur_path, AppendPath) || IsA(cur_path, MergeAppendPath)) ||
rel->has_eclass_joins || rel->joininfo)
{
continue;
}
/* Get existing parameterization */
ppi = get_appendrel_parampathinfo(rel, inner_required);
if (IsA(cur_path, AppendPath) && pg_pathman_enable_runtimeappend)
inner_path = create_runtime_append_path(root, cur_path,
ppi, paramsel);
else if (IsA(cur_path, MergeAppendPath) &&
pg_pathman_enable_runtime_merge_append)
{
/* Check struct layout compatibility */
if (offsetof(AppendPath, subpaths) !=
offsetof(MergeAppendPath, subpaths))
elog(FATAL, "Struct layouts of AppendPath and "
"MergeAppendPath differ");
inner_path = create_runtime_merge_append_path(root, cur_path,
ppi, paramsel);
}
if (inner_path)
add_path(rel, inner_path);
}
cleanup:
/* Don't forget to close 'prel'! */
close_pathman_relation_info(prel);
}
/*
* 'pg_pathman.enable' GUC check.
*/
bool
pathman_enable_check_hook(bool *newval, void **extra, GucSource source)
{
if (FirstSnapshotSet ||
GetTopTransactionIdIfAny() != InvalidTransactionId ||
#ifdef PGPRO_EE
getNestLevelATX() > 0 ||
#endif
IsSubTransaction())
{
GUC_check_errcode(ERRCODE_ACTIVE_SQL_TRANSACTION);
GUC_check_errmsg("\"pg_pathman.enable\" must be called before any query");
return false;
}
return true;
}
/*
* Intercept 'pg_pathman.enable' GUC assignments.
*/
void
pathman_enable_assign_hook(bool newval, void *extra)
{
elog(DEBUG2, "pg_pathman_enable_assign_hook() [newval = %s] triggered",
newval ? "true" : "false");
if (!(newval == pathman_init_state.pg_pathman_enable &&
newval == pathman_init_state.auto_partition &&
newval == pathman_init_state.override_copy &&
newval == pg_pathman_enable_runtimeappend &&
newval == pg_pathman_enable_runtime_merge_append &&
newval == pg_pathman_enable_partition_filter &&
newval == pg_pathman_enable_bounds_cache))
{
elog(NOTICE,
"RuntimeAppend, RuntimeMergeAppend and PartitionFilter nodes "
"and some other options have been %s",
newval ? "enabled" : "disabled");
}
pathman_init_state.auto_partition = newval;
pathman_init_state.override_copy = newval;
pg_pathman_enable_runtimeappend = newval;
pg_pathman_enable_runtime_merge_append = newval;
pg_pathman_enable_partition_filter = newval;
pg_pathman_enable_bounds_cache = newval;
/* Purge caches if pathman was disabled */
if (!newval)
{
unload_config();
}
}
static void
execute_for_plantree(PlannedStmt *planned_stmt,
Plan *(*proc) (List *rtable, Plan *plan))
{
List *subplans = NIL;
ListCell *lc;
Plan *resplan = proc(planned_stmt->rtable, planned_stmt->planTree);
if (resplan)
planned_stmt->planTree = resplan;
foreach (lc, planned_stmt->subplans)
{
Plan *subplan = lfirst(lc);
resplan = proc(planned_stmt->rtable, (Plan *) lfirst(lc));
if (resplan)
subplans = lappend(subplans, resplan);
else
subplans = lappend(subplans, subplan);
}
planned_stmt->subplans = subplans;
}
/*
* Truncated version of set_plan_refs.
* Pathman can add nodes to already completed and post-processed plan tree.
* reset_plan_node_ids fixes some presentation values for updated plan tree
* to avoid problems in further processing.
*/
static Plan *
reset_plan_node_ids(Plan *plan, void *lastPlanNodeId)
{
if (plan == NULL)
return NULL;
plan->plan_node_id = (*(int *) lastPlanNodeId)++;
return plan;
}
/*
* Planner hook. It disables inheritance for tables that have been partitioned
* by pathman to prevent standart PostgreSQL partitioning mechanism from
* handling those tables.
*
* Since >= 13 (6aba63ef3e6) query_string parameter was added.
*/
PlannedStmt *
#if PG_VERSION_NUM >= 130000
pathman_planner_hook(Query *parse, const char *query_string, int cursorOptions, ParamListInfo boundParams)
#else
pathman_planner_hook(Query *parse, int cursorOptions, ParamListInfo boundParams)
#endif
{
PlannedStmt *result;
uint64 query_id = parse->queryId;
/* Save the result in case it changes */
bool pathman_ready = IsPathmanReady();
PG_TRY();
{
if (pathman_ready)
{
/* Increase planner() calls count */
incr_planner_calls_count();
/* Modify query tree if needed */
pathman_transform_query(parse, boundParams);
}
/* Invoke original hook if needed */
if (pathman_planner_hook_next)
#if PG_VERSION_NUM >= 130000
result = pathman_planner_hook_next(parse, query_string, cursorOptions, boundParams);
#else
result = pathman_planner_hook_next(parse, cursorOptions, boundParams);
#endif
else
#if PG_VERSION_NUM >= 130000
result = standard_planner(parse, query_string, cursorOptions, boundParams);
#else
result = standard_planner(parse, cursorOptions, boundParams);
#endif
if (pathman_ready)
{
int lastPlanNodeId = 0;
ListCell *l;
/* Add PartitionFilter node for INSERT queries */
execute_for_plantree(result, add_partition_filters);
/* Add PartitionRouter node for UPDATE queries */
execute_for_plantree(result, add_partition_routers);
/* Decrement planner() calls count */
decr_planner_calls_count();
/* remake parsed tree presentation fixes due to possible adding nodes */
result->planTree = plan_tree_visitor(result->planTree, reset_plan_node_ids, &lastPlanNodeId);
foreach(l, result->subplans)
{
lfirst(l) = plan_tree_visitor((Plan *) lfirst(l), reset_plan_node_ids, &lastPlanNodeId);
}
/* HACK: restore queryId set by pg_stat_statements */
result->queryId = query_id;
}
}
/* We must decrease parenthood statuses refcount on ERROR */
PG_CATCH();
{
if (pathman_ready)
{
/* Caught an ERROR, decrease count */
decr_planner_calls_count();
}
/* Rethrow ERROR further */
PG_RE_THROW();
}
PG_END_TRY();
/* Finally return the Plan */
return result;
}
/*
* Post parse analysis hook. It makes sure the config is loaded before executing
* any statement, including utility commands.
*/
#if PG_VERSION_NUM >= 140000
/*
* pathman_post_parse_analyze_hook(), pathman_post_parse_analyze_hook_next():
* in 14 new argument was added (5fd9dfa5f50)
*/
void
pathman_post_parse_analyze_hook(ParseState *pstate, Query *query, JumbleState *jstate)
{
/* Invoke original hook if needed */
if (pathman_post_parse_analyze_hook_next)
pathman_post_parse_analyze_hook_next(pstate, query, jstate);
#else
void
pathman_post_parse_analyze_hook(ParseState *pstate, Query *query)
{
/* Invoke original hook if needed */
if (pathman_post_parse_analyze_hook_next)
pathman_post_parse_analyze_hook_next(pstate, query);
#endif
/* See cook_partitioning_expression() */
if (!pathman_hooks_enabled)
return;
/* We shouldn't proceed on: ... */
if (query->commandType == CMD_UTILITY)
{
/* ... BEGIN */
if (xact_is_transaction_stmt(query->utilityStmt))
return;
/* ... SET pg_pathman.enable */
if (xact_is_set_stmt(query->utilityStmt, PATHMAN_ENABLE))
{
/* Accept all events in case it's "enable = OFF" */
if (IsPathmanReady())
finish_delayed_invalidation();
return;
}
/* ... SET [TRANSACTION] */
if (xact_is_set_stmt(query->utilityStmt, NULL))
return;
/* ... ALTER EXTENSION pg_pathman */
if (xact_is_alter_pathman_stmt(query->utilityStmt))
{
/* Leave no delayed events before ALTER EXTENSION */
if (IsPathmanReady())
finish_delayed_invalidation();
/* Disable pg_pathman to perform a painless update */
(void) set_config_option(PATHMAN_ENABLE, "off",
PGC_SUSET, PGC_S_SESSION,
GUC_ACTION_SAVE, true, 0, false);
return;
}
}
/* Finish all delayed invalidation jobs */
if (IsPathmanReady())
finish_delayed_invalidation();
/* Load config if pg_pathman exists & it's still necessary */
if (IsPathmanEnabled() &&
!IsPathmanInitialized() &&
/* Now evaluate the most expensive clause */
get_pathman_schema() != InvalidOid)
{
load_config(); /* perform main cache initialization */
}
if (!IsPathmanReady())
return;
/* Process inlined SQL functions (we've already entered planning stage) */
if (IsPathmanReady() && get_planner_calls_count() > 0)
{
/* Check that pg_pathman is the last extension loaded */
if (post_parse_analyze_hook != pathman_post_parse_analyze_hook)
{
Oid save_userid;
int save_sec_context;
bool need_priv_escalation = !superuser(); /* we might be a SU */
char *spl_value; /* value of "shared_preload_libraries" GUC */
/* 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);
}
/* TODO: add a test for this case (non-privileged user etc) */
/* Only SU can read this GUC */
#if PG_VERSION_NUM >= 90600
spl_value = GetConfigOptionByName("shared_preload_libraries", NULL, false);
#else
spl_value = GetConfigOptionByName("shared_preload_libraries", NULL);
#endif
/* Restore user's privileges */
if (need_priv_escalation)
SetUserIdAndSecContext(save_userid, save_sec_context);
ereport(ERROR,
(errmsg("extension conflict has been detected"),
errdetail("shared_preload_libraries = \"%s\"", spl_value),
errhint("pg_pathman should be the last extension listed in "
"\"shared_preload_libraries\" GUC in order to "
"prevent possible conflicts with other extensions")));
}
/* Modify query tree if needed */
pathman_transform_query(query, NULL);
return;
}
#if PG_VERSION_NUM >= 100000
/*
* for now this call works only for declarative partitioning so
* we disabled it
*/
pathman_post_analyze_query(query);
#endif
}
/*
* Initialize dsm_config & shmem_config.
*/
void
pathman_shmem_startup_hook(void)
{
/* Invoke original hook if needed */
if (pathman_shmem_startup_hook_next)
pathman_shmem_startup_hook_next();
/* Allocate shared memory objects */
LWLockAcquire(AddinShmemInitLock, LW_EXCLUSIVE);
init_concurrent_part_task_slots();
LWLockRelease(AddinShmemInitLock);
}
/*
* Invalidate PartRelationInfo cache entry if needed.
*/
void
pathman_relcache_hook(Datum arg, Oid relid)
{
Oid pathman_config_relid;
/* See cook_partitioning_expression() */
if (!pathman_hooks_enabled)
return;
if (!IsPathmanReady())
return;
/* Invalidation event for whole cache */
if (relid == InvalidOid)
{
invalidate_bounds_cache();
invalidate_parents_cache();
invalidate_status_cache();
delay_pathman_shutdown(); /* see below */
}
/*
* Invalidation event for PATHMAN_CONFIG table (probably DROP EXTENSION).
* Digging catalogs here is expensive and probably illegal, so we take
* cached relid. It is possible that we don't know it atm (e.g. pathman
* was disabled). However, in this case caches must have been cleaned
* on disable, and there is no DROP-specific additional actions.
*/
pathman_config_relid = get_pathman_config_relid(true);
if (relid == pathman_config_relid)
{
delay_pathman_shutdown();
}
/* Invalidation event for some user table */
else if (relid >= FirstNormalObjectId)
{
/* Invalidate PartBoundInfo entry if needed */
forget_bounds_of_rel(relid);