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createas.c
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createas.c
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/*-------------------------------------------------------------------------
*
* createas.c
* incremental view maintenance extension
* Routines for creating IMMVs
*
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
* Portions Copyright (c) 2022, IVM Development Group
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "access/reloptions.h"
#include "access/xact.h"
#include "catalog/dependency.h"
#include "catalog/index.h"
#include "catalog/indexing.h"
#include "catalog/pg_am.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_inherits.h"
#include "catalog/pg_trigger_d.h"
#include "catalog/toasting.h"
#include "commands/createas.h"
#include "commands/defrem.h"
#include "commands/tablecmds.h"
#include "commands/tablespace.h"
#include "commands/trigger.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
#include "optimizer/prep.h"
#include "parser/parser.h"
#include "parser/parsetree.h"
#include "parser/parse_clause.h"
#include "parser/parse_func.h"
#include "parser/parse_type.h"
#include "rewrite/rewriteHandler.h"
#include "rewrite/rewriteManip.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
#include "utils/regproc.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#include "pg_ivm.h"
typedef struct
{
DestReceiver pub; /* publicly-known function pointers */
IntoClause *into; /* target relation specification */
/* These fields are filled by intorel_startup: */
Relation rel; /* relation to write to */
ObjectAddress reladdr; /* address of rel, for ExecCreateTableAs */
CommandId output_cid; /* cmin to insert in output tuples */
int ti_options; /* table_tuple_insert performance options */
BulkInsertState bistate; /* bulk insert state */
} DR_intorel;
/* utility functions for IMMV definition creation */
static ObjectAddress create_immv_internal(List *attrList, IntoClause *into);
static ObjectAddress create_immv_nodata(List *tlist, IntoClause *into);
typedef struct
{
bool has_agg; /* the query has an aggregate */
bool allow_exists; /* EXISTS subquery is allowed in the current node */
bool in_exists_subquery; /* true, if under an EXISTS subquery */
List *exists_qual_vars; /* Vars used in EXISTS subqueries */
int sublevels_up; /* (current) nesting depth */
} check_ivm_restriction_context;
static void CreateIvmTriggersOnBaseTablesRecurse(Query *qry, Node *node, Oid matviewOid,
Relids *relids, bool ex_lock);
static void CreateIvmTrigger(Oid relOid, Oid viewOid, int16 type, int16 timing, bool ex_lock);
static void check_ivm_restriction(Node *node);
static bool check_ivm_restriction_walker(Node *node, check_ivm_restriction_context *context);
static Bitmapset *get_primary_key_attnos_from_query(Query *query, List **constraintList);
static bool check_aggregate_supports_ivm(Oid aggfnoid);
static void StoreImmvQuery(Oid viewOid, Query *viewQuery);
#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM < 140000)
static bool CreateTableAsRelExists(CreateTableAsStmt *ctas);
#endif
/*
* create_immv_internal
*
* Internal utility used for the creation of the definition of an IMMV.
* Caller needs to provide a list of attributes (ColumnDef nodes).
*
* This imitates PostgreSQL's create_ctas_internal().
*/
static ObjectAddress
create_immv_internal(List *attrList, IntoClause *into)
{
CreateStmt *create = makeNode(CreateStmt);
char relkind;
Datum toast_options;
static char *validnsps[] = HEAP_RELOPT_NAMESPACES;
ObjectAddress intoRelationAddr;
/* This code supports both CREATE TABLE AS and CREATE MATERIALIZED VIEW */
/* relkind of IMMV must be RELKIND_RELATION */
relkind = RELKIND_RELATION;
/*
* Create the target relation by faking up a CREATE TABLE parsetree and
* passing it to DefineRelation.
*/
create->relation = into->rel;
create->tableElts = attrList;
create->inhRelations = NIL;
create->ofTypename = NULL;
create->constraints = NIL;
create->options = into->options;
create->oncommit = into->onCommit;
create->tablespacename = into->tableSpaceName;
create->if_not_exists = false;
create->accessMethod = into->accessMethod;
/*
* Create the relation. (This will error out if there's an existing view,
* so we don't need more code to complain if "replace" is false.)
*/
intoRelationAddr = DefineRelation(create, relkind, InvalidOid, NULL, NULL);
/*
* If necessary, create a TOAST table for the target table. Note that
* NewRelationCreateToastTable ends with CommandCounterIncrement(), so
* that the TOAST table will be visible for insertion.
*/
CommandCounterIncrement();
/* parse and validate reloptions for the toast table */
toast_options = transformRelOptions((Datum) 0,
create->options,
"toast",
validnsps,
true, false);
(void) heap_reloptions(RELKIND_TOASTVALUE, toast_options, true);
NewRelationCreateToastTable(intoRelationAddr.objectId, toast_options);
/* Create the "view" part of an IMMV. */
StoreImmvQuery(intoRelationAddr.objectId, (Query *) into->viewQuery);
CommandCounterIncrement();
return intoRelationAddr;
}
/*
* create_immv_nodata
*
* Create an IMMV when WITH NO DATA is used, starting from
* the targetlist of the view definition.
*
* This imitates PostgreSQL's create_ctas_nodata().
*/
static ObjectAddress
create_immv_nodata(List *tlist, IntoClause *into)
{
List *attrList;
ListCell *t,
*lc;
/*
* Build list of ColumnDefs from non-junk elements of the tlist. If a
* column name list was specified in CREATE TABLE AS, override the column
* names in the query. (Too few column names are OK, too many are not.)
*/
attrList = NIL;
lc = list_head(into->colNames);
foreach(t, tlist)
{
TargetEntry *tle = (TargetEntry *) lfirst(t);
if (!tle->resjunk)
{
ColumnDef *col;
char *colname;
if (lc)
{
colname = strVal(lfirst(lc));
lc = lnext(into->colNames, lc);
}
else
colname = tle->resname;
col = makeColumnDef(colname,
exprType((Node *) tle->expr),
exprTypmod((Node *) tle->expr),
exprCollation((Node *) tle->expr));
/*
* It's possible that the column is of a collatable type but the
* collation could not be resolved, so double-check. (We must
* check this here because DefineRelation would adopt the type's
* default collation rather than complaining.)
*/
if (!OidIsValid(col->collOid) &&
type_is_collatable(col->typeName->typeOid))
ereport(ERROR,
(errcode(ERRCODE_INDETERMINATE_COLLATION),
errmsg("no collation was derived for column \"%s\" with collatable type %s",
col->colname,
format_type_be(col->typeName->typeOid)),
errhint("Use the COLLATE clause to set the collation explicitly.")));
attrList = lappend(attrList, col);
}
}
if (lc != NULL)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("too many column names were specified")));
/* Create the relation definition using the ColumnDef list */
return create_immv_internal(attrList, into);
}
/*
* ExecCreateImmv -- execute a create_immv() function
*
* This imitates PostgreSQL's ExecCreateTableAs().
*/
ObjectAddress
ExecCreateImmv(ParseState *pstate, CreateTableAsStmt *stmt,
ParamListInfo params, QueryEnvironment *queryEnv,
QueryCompletion *qc)
{
Query *query = castNode(Query, stmt->query);
IntoClause *into = stmt->into;
bool do_refresh = false;
ObjectAddress address;
/* Check if the relation exists or not */
if (CreateTableAsRelExists(stmt))
return InvalidObjectAddress;
/*
* The contained Query must be a SELECT.
*/
Assert(query->commandType == CMD_SELECT);
/*
* For materialized views, always skip data during table creation, and use
* REFRESH instead (see below).
*/
do_refresh = !into->skipData;
/* check if the query is supported in IMMV definition */
if (contain_mutable_functions((Node *) query))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("mutable function is not supported on incrementally maintainable materialized view"),
errhint("functions must be marked IMMUTABLE")));
check_ivm_restriction((Node *) query);
/* For IMMV, we need to rewrite matview query */
query = rewriteQueryForIMMV(query, into->colNames);
/*
* If WITH NO DATA was specified, do not go through the rewriter,
* planner and executor. Just define the relation using a code path
* similar to CREATE VIEW. This avoids dump/restore problems stemming
* from running the planner before all dependencies are set up.
*/
address = create_immv_nodata(query->targetList, into);
/*
* For materialized views, reuse the REFRESH logic, which locks down
* security-restricted operations and restricts the search_path. This
* reduces the chance that a subsequent refresh will fail.
*/
if (do_refresh)
{
Relation matviewRel;
RefreshImmvByOid(address.objectId, false, pstate->p_sourcetext, qc);
if (qc)
qc->commandTag = CMDTAG_SELECT;
matviewRel = table_open(address.objectId, NoLock);
/* Create an index on incremental maintainable materialized view, if possible */
CreateIndexOnIMMV(query, matviewRel);
/* Create triggers to prevent IMMV from beeing changed */
CreateChangePreventTrigger(address.objectId);
table_close(matviewRel, NoLock);
}
return address;
}
/*
* rewriteQueryForIMMV -- rewrite view definition query for IMMV
*
* count(*) is added for counting distinct tuples in views.
* Also, additional hidden columns are added for aggregate values.
*
* EXISTS sublink is rewritten to LATERAL subquery with HAVING
* clause to check count(*) > 0. In addition, a counting column
* referring to count(*) in this subquery is added to the original
* target list.
*/
Query *
rewriteQueryForIMMV(Query *query, List *colNames)
{
Query *rewritten;
Node *node;
ParseState *pstate = make_parsestate(NULL);
FuncCall *fn;
/*
* Check the length of colunm name list not to override names of
* additional columns
*/
if (list_length(colNames) > list_length(query->targetList))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("too many column names were specified")));
rewritten = copyObject(query);
pstate->p_expr_kind = EXPR_KIND_SELECT_TARGET;
/*
* If this query has EXISTS clause, rewrite query and
* add __ivm_exists_count_X__ column.
*/
if (rewritten->hasSubLinks)
{
ListCell *lc;
RangeTblEntry *rte;
int varno = 0;
/* rewrite EXISTS sublink to LATERAL subquery */
rewrite_query_for_exists_subquery(rewritten);
/* Add counting column referring to count(*) in EXISTS clause */
foreach(lc, rewritten->rtable)
{
char *columnName;
int attnum;
Node *countCol = NULL;
varno++;
rte = (RangeTblEntry *) lfirst(lc);
if (!rte->subquery || !rte->lateral)
continue;
pstate->p_rtable = rewritten->rtable;
columnName = getColumnNameStartWith(rte, "__ivm_exists", &attnum);
if (columnName == NULL)
continue;
countCol = (Node *) makeVar(varno, attnum,
INT8OID, -1, InvalidOid, 0);
if (countCol != NULL)
{
TargetEntry *tle = makeTargetEntry((Expr *) countCol,
list_length(rewritten->targetList) + 1,
pstrdup(columnName),
false);
rewritten->targetList = list_concat(rewritten->targetList, list_make1(tle));
}
}
}
/* group keys must be in targetlist */
if (rewritten->groupClause)
{
ListCell *lc;
foreach(lc, rewritten->groupClause)
{
SortGroupClause *scl = (SortGroupClause *) lfirst(lc);
TargetEntry *tle = get_sortgroupclause_tle(scl, rewritten->targetList);
if (tle->resjunk)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("GROUP BY expression not appearing in select list is not supported on incrementally maintainable materialized view")));
}
}
/* Convert DISTINCT to GROUP BY. count(*) will be added afterward. */
else if (!rewritten->hasAggs && rewritten->distinctClause)
rewritten->groupClause = transformDistinctClause(NULL, &rewritten->targetList, rewritten->sortClause, false);
/* Add additional columns for aggregate values */
if (rewritten->hasAggs)
{
ListCell *lc;
List *aggs = NIL;
AttrNumber next_resno = list_length(rewritten->targetList) + 1;
foreach(lc, rewritten->targetList)
{
TargetEntry *tle = (TargetEntry *) lfirst(lc);
char *resname = (colNames == NIL || foreach_current_index(lc) >= list_length(colNames) ?
tle->resname : strVal(list_nth(colNames, tle->resno - 1)));
if (IsA(tle->expr, Aggref))
makeIvmAggColumn(pstate, (Aggref *) tle->expr, resname, &next_resno, &aggs);
}
rewritten->targetList = list_concat(rewritten->targetList, aggs);
}
/* Add count(*) for counting distinct tuples in views */
if (rewritten->distinctClause || rewritten->hasAggs)
{
TargetEntry *tle;
#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 140000)
fn = makeFuncCall(SystemFuncName("count"), NIL, COERCE_EXPLICIT_CALL, -1);
#else
fn = makeFuncCall(SystemFuncName("count"), NIL, -1);
#endif
fn->agg_star = true;
node = ParseFuncOrColumn(pstate, fn->funcname, NIL, NULL, fn, false, -1);
tle = makeTargetEntry((Expr *) node,
list_length(rewritten->targetList) + 1,
pstrdup("__ivm_count__"),
false);
rewritten->targetList = lappend(rewritten->targetList, tle);
rewritten->hasAggs = true;
}
return rewritten;
}
/*
* makeIvmAggColumn -- make additional aggregate columns for IVM
*
* For an aggregate column specified by aggref, additional aggregate columns
* are added, which are used to calculate the new aggregate value in IMMV.
* An additional aggregate columns has a name based on resname
* (ex. ivm_count_resname), and resno specified by next_resno. The created
* columns are returned to aggs, and the resno for the next column is also
* returned to next_resno.
*
* Currently, an additional count() is created for aggref other than count.
* In addition, sum() is created for avg aggregate column.
*/
void
makeIvmAggColumn(ParseState *pstate, Aggref *aggref, char *resname, AttrNumber *next_resno, List **aggs)
{
TargetEntry *tle_count;
Node *node;
FuncCall *fn;
Const *dmy_arg = makeConst(INT4OID,
-1,
InvalidOid,
sizeof(int32),
Int32GetDatum(1),
false,
true); /* pass by value */
const char *aggname = get_func_name(aggref->aggfnoid);
/*
* For aggregate functions except count, add count() func with the same arg parameters.
* This count result is used for determining if the aggregate value should be NULL or not.
* Also, add sum() func for avg because we need to calculate an average value as sum/count.
*
* XXX: If there are same expressions explicitly in the target list, we can use this instead
* of adding new duplicated one.
*/
if (strcmp(aggname, "count") != 0)
{
#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 140000)
fn = makeFuncCall(SystemFuncName("count"), NIL, COERCE_EXPLICIT_CALL, -1);
#else
fn = makeFuncCall(SystemFuncName("count"), NIL, -1);
#endif
/* Make a Func with a dummy arg, and then override this by the original agg's args. */
node = ParseFuncOrColumn(pstate, fn->funcname, list_make1(dmy_arg), NULL, fn, false, -1);
((Aggref *) node)->args = aggref->args;
tle_count = makeTargetEntry((Expr *) node,
*next_resno,
pstrdup(makeObjectName("__ivm_count",resname, "_")),
false);
*aggs = lappend(*aggs, tle_count);
(*next_resno)++;
}
if (strcmp(aggname, "avg") == 0)
{
List *dmy_args = NIL;
ListCell *lc;
foreach(lc, aggref->aggargtypes)
{
Oid typeid = lfirst_oid(lc);
Type type = typeidType(typeid);
Const *con = makeConst(typeid,
-1,
typeTypeCollation(type),
typeLen(type),
(Datum) 0,
true,
typeByVal(type));
dmy_args = lappend(dmy_args, con);
ReleaseSysCache(type);
}
#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 140000)
fn = makeFuncCall(SystemFuncName("sum"), NIL, COERCE_EXPLICIT_CALL, -1);
#else
fn = makeFuncCall(SystemFuncName("sum"), NIL, -1);
#endif
/* Make a Func with dummy args, and then override this by the original agg's args. */
node = ParseFuncOrColumn(pstate, fn->funcname, dmy_args, NULL, fn, false, -1);
((Aggref *) node)->args = aggref->args;
tle_count = makeTargetEntry((Expr *) node,
*next_resno,
pstrdup(makeObjectName("__ivm_sum",resname, "_")),
false);
*aggs = lappend(*aggs, tle_count);
(*next_resno)++;
}
}
/*
* CreateIvmTriggersOnBaseTables -- create IVM triggers on all base tables
*/
void
CreateIvmTriggersOnBaseTables(Query *qry, Oid matviewOid)
{
Relids relids = NULL;
bool ex_lock = false;
RangeTblEntry *rte;
/* Immediately return if we don't have any base tables. */
if (list_length(qry->rtable) < 1)
return;
/*
* If the view has more than one base tables, we need an exclusive lock
* on the view so that the view would be maintained serially to avoid
* the inconsistency that occurs when two base tables are modified in
* concurrent transactions. However, if the view has only one table,
* we can use a weaker lock.
*
* The type of lock should be determined here, because if we check the
* view definition at maintenance time, we need to acquire a weaker lock,
* and upgrading the lock level after this increases probability of
* deadlock.
*
* XXX: For the current extension version, DISTINCT and aggregates with GROUP
* need exclusive lock to prevent inconsistency that can be avoided by using
* nulls_not_distinct which is available only in PG15 or later.
* XXX: This lock is not necessary if all columns in group keys or distinct
* target list are not nullable.
*/
rte = list_nth(qry->rtable, 0);
if (list_length(qry->rtable) > 1 || rte->rtekind != RTE_RELATION ||
qry->distinctClause || (qry->hasAggs && qry->groupClause))
ex_lock = true;
CreateIvmTriggersOnBaseTablesRecurse(qry, (Node *)qry, matviewOid, &relids, ex_lock);
bms_free(relids);
}
static void
CreateIvmTriggersOnBaseTablesRecurse(Query *qry, Node *node, Oid matviewOid,
Relids *relids, bool ex_lock)
{
if (node == NULL)
return;
/* This can recurse, so check for excessive recursion */
check_stack_depth();
switch (nodeTag(node))
{
case T_Query:
{
Query *query = (Query *) node;
ListCell *lc;
CreateIvmTriggersOnBaseTablesRecurse(qry, (Node *) query->jointree, matviewOid, relids, ex_lock);
foreach(lc, query->cteList)
{
CommonTableExpr *cte = (CommonTableExpr *) lfirst(lc);
Assert(IsA(cte->ctequery, Query));
CreateIvmTriggersOnBaseTablesRecurse((Query *) cte->ctequery, cte->ctequery, matviewOid, relids, ex_lock);
}
}
break;
case T_RangeTblRef:
{
int rti = ((RangeTblRef *) node)->rtindex;
RangeTblEntry *rte = rt_fetch(rti, qry->rtable);
if (rte->rtekind == RTE_RELATION && !bms_is_member(rte->relid, *relids))
{
CreateIvmTrigger(rte->relid, matviewOid, TRIGGER_TYPE_INSERT, TRIGGER_TYPE_BEFORE, ex_lock);
CreateIvmTrigger(rte->relid, matviewOid, TRIGGER_TYPE_DELETE, TRIGGER_TYPE_BEFORE, ex_lock);
CreateIvmTrigger(rte->relid, matviewOid, TRIGGER_TYPE_UPDATE, TRIGGER_TYPE_BEFORE, ex_lock);
CreateIvmTrigger(rte->relid, matviewOid, TRIGGER_TYPE_TRUNCATE, TRIGGER_TYPE_BEFORE, true);
CreateIvmTrigger(rte->relid, matviewOid, TRIGGER_TYPE_INSERT, TRIGGER_TYPE_AFTER, ex_lock);
CreateIvmTrigger(rte->relid, matviewOid, TRIGGER_TYPE_DELETE, TRIGGER_TYPE_AFTER, ex_lock);
CreateIvmTrigger(rte->relid, matviewOid, TRIGGER_TYPE_UPDATE, TRIGGER_TYPE_AFTER, ex_lock);
CreateIvmTrigger(rte->relid, matviewOid, TRIGGER_TYPE_TRUNCATE, TRIGGER_TYPE_AFTER, true);
*relids = bms_add_member(*relids, rte->relid);
}
else if (rte->rtekind == RTE_SUBQUERY)
{
Query *subquery = rte->subquery;
Assert(rte->subquery != NULL);
CreateIvmTriggersOnBaseTablesRecurse(subquery, (Node *) subquery, matviewOid, relids, ex_lock);
}
}
break;
case T_FromExpr:
{
FromExpr *f = (FromExpr *) node;
ListCell *l;
foreach(l, f->fromlist)
CreateIvmTriggersOnBaseTablesRecurse(qry, lfirst(l), matviewOid, relids, ex_lock);
}
break;
case T_JoinExpr:
{
JoinExpr *j = (JoinExpr *) node;
CreateIvmTriggersOnBaseTablesRecurse(qry, j->larg, matviewOid, relids, ex_lock);
CreateIvmTriggersOnBaseTablesRecurse(qry, j->rarg, matviewOid, relids, ex_lock);
}
break;
default:
elog(ERROR, "unrecognized node type: %d", (int) nodeTag(node));
}
}
/*
* CreateIvmTrigger -- create IVM trigger on a base table
*/
static void
CreateIvmTrigger(Oid relOid, Oid viewOid, int16 type, int16 timing, bool ex_lock)
{
ObjectAddress refaddr;
ObjectAddress address;
CreateTrigStmt *ivm_trigger;
List *transitionRels = NIL;
Assert(timing == TRIGGER_TYPE_BEFORE || timing == TRIGGER_TYPE_AFTER);
refaddr.classId = RelationRelationId;
refaddr.objectId = viewOid;
refaddr.objectSubId = 0;
ivm_trigger = makeNode(CreateTrigStmt);
ivm_trigger->relation = NULL;
ivm_trigger->row = false;
ivm_trigger->timing = timing;
ivm_trigger->events = type;
switch (type)
{
case TRIGGER_TYPE_INSERT:
ivm_trigger->trigname = (timing == TRIGGER_TYPE_BEFORE ? "IVM_trigger_ins_before" : "IVM_trigger_ins_after");
break;
case TRIGGER_TYPE_DELETE:
ivm_trigger->trigname = (timing == TRIGGER_TYPE_BEFORE ? "IVM_trigger_del_before" : "IVM_trigger_del_after");
break;
case TRIGGER_TYPE_UPDATE:
ivm_trigger->trigname = (timing == TRIGGER_TYPE_BEFORE ? "IVM_trigger_upd_before" : "IVM_trigger_upd_after");
break;
case TRIGGER_TYPE_TRUNCATE:
ivm_trigger->trigname = (timing == TRIGGER_TYPE_BEFORE ? "IVM_trigger_truncate_before" : "IVM_trigger_truncate_after");
break;
default:
elog(ERROR, "unsupported trigger type");
}
if (timing == TRIGGER_TYPE_AFTER)
{
if (type == TRIGGER_TYPE_INSERT || type == TRIGGER_TYPE_UPDATE)
{
TriggerTransition *n = makeNode(TriggerTransition);
n->name = "__ivm_newtable";
n->isNew = true;
n->isTable = true;
transitionRels = lappend(transitionRels, n);
}
if (type == TRIGGER_TYPE_DELETE || type == TRIGGER_TYPE_UPDATE)
{
TriggerTransition *n = makeNode(TriggerTransition);
n->name = "__ivm_oldtable";
n->isNew = false;
n->isTable = true;
transitionRels = lappend(transitionRels, n);
}
}
/*
* XXX: When using DELETE or UPDATE, we must use exclusive lock for now
* because apply_old_delta(_with_count) doesn't work in concurrent situations.
*
* If the view doesn't have aggregate, distinct, or tuple duplicate, then it
* would work. However, we don't have any way to guarantee the view has a unique
* key before opening the IMMV at the maintenance time because users may drop
* the unique index. We need something to resolve the issue!!
*/
if (type == TRIGGER_TYPE_DELETE || type == TRIGGER_TYPE_UPDATE)
ex_lock = true;
ivm_trigger->funcname =
(timing == TRIGGER_TYPE_BEFORE ? SystemFuncName("IVM_immediate_before") : SystemFuncName("IVM_immediate_maintenance"));
ivm_trigger->columns = NIL;
ivm_trigger->transitionRels = transitionRels;
ivm_trigger->whenClause = NULL;
ivm_trigger->isconstraint = false;
ivm_trigger->deferrable = false;
ivm_trigger->initdeferred = false;
ivm_trigger->constrrel = NULL;
ivm_trigger->args = list_make2(
makeString(DatumGetPointer(DirectFunctionCall1(oidout, ObjectIdGetDatum(viewOid)))),
makeString(DatumGetPointer(DirectFunctionCall1(boolout, BoolGetDatum(ex_lock))))
);
address = CreateTrigger(ivm_trigger, NULL, relOid, InvalidOid, InvalidOid,
InvalidOid, InvalidOid, InvalidOid, NULL, true, false);
recordDependencyOn(&address, &refaddr, DEPENDENCY_AUTO);
/* Make changes-so-far visible */
CommandCounterIncrement();
}
/*
* check_ivm_restriction --- look for specify nodes in the query tree
*/
static void
check_ivm_restriction(Node *node)
{
check_ivm_restriction_context context;
context.has_agg = false;
context.allow_exists = false;
context.in_exists_subquery = false;
context.exists_qual_vars = NIL;
context.sublevels_up = 0;
check_ivm_restriction_walker(node, &context);
}
static bool
check_ivm_restriction_walker(Node *node, check_ivm_restriction_context *context)
{
/* EXISTS is allowed only in this node */
bool allow_exists = context->allow_exists;
context->allow_exists = false;
if (node == NULL)
return false;
/* This can recurse, so check for excessive recursion */
check_stack_depth();
switch (nodeTag(node))
{
case T_Query:
{
Query *qry = (Query *) node;
ListCell *lc;
List *vars;
if (qry->groupClause != NIL && !qry->hasAggs)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("GROUP BY clause without aggregate is not supported on incrementally maintainable materialized view")));
if (qry->havingQual != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("HAVING clause is not supported on incrementally maintainable materialized view")));
if (qry->sortClause != NIL) /* There is a possibility that we don't need to return an error */
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("ORDER BY clause is not supported on incrementally maintainable materialized view")));
if (qry->limitOffset != NULL || qry->limitCount != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("LIMIT/OFFSET clause is not supported on incrementally maintainable materialized view")));
if (qry->hasDistinctOn)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("DISTINCT ON is not supported on incrementally maintainable materialized view")));
if (qry->hasWindowFuncs)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("window functions are not supported on incrementally maintainable materialized view")));
if (qry->groupingSets != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("GROUPING SETS, ROLLUP, or CUBE clauses is not supported on incrementally maintainable materialized view")));
if (qry->setOperations != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("UNION/INTERSECT/EXCEPT statements are not supported on incrementally maintainable materialized view")));
if (list_length(qry->targetList) == 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("empty target list is not supported on incrementally maintainable materialized view")));
if (qry->rowMarks != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("FOR UPDATE/SHARE clause is not supported on incrementally maintainable materialized view")));
if (qry->hasRecursive)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("recursive query is not supported on incrementally maintainable materialized view")));
/* system column restrictions */
vars = pull_vars_of_level((Node *) qry, 0);
foreach(lc, vars)
{
if (IsA(lfirst(lc), Var))
{
Var *var = (Var *) lfirst(lc);
/* if the view has a system column, raise an error */
if (var->varattno < 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("system column is not supported on incrementally maintainable materialized view")));
}
}
/* check that each type in the target list has an equality operator */
if (context->sublevels_up == 0)
{
foreach(lc, qry->targetList)
{
TargetEntry *tle = (TargetEntry *) lfirst(lc);
Oid atttype = exprType((Node *) tle->expr);
Oid opclass;
opclass = GetDefaultOpClass(atttype, BTREE_AM_OID);
if (!OidIsValid(opclass))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("data type %s has no default operator class for access method \"%s\"",
format_type_be(atttype), "btree")));
}
}
/* subquery restrictions */
if (context->sublevels_up > 0 && qry->distinctClause != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("DISTINCT clause in nested query are not supported on incrementally maintainable materialized view")));
if (context->sublevels_up > 0 && qry->hasAggs)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("aggregate functions in nested query are not supported on incrementally maintainable materialized view")));
context->has_agg |= qry->hasAggs;
/* restrictions for rtable */
foreach(lc, qry->rtable)
{
RangeTblEntry *rte = (RangeTblEntry *) lfirst(lc);
if (rte->tablesample != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("TABLESAMPLE clause is not supported on incrementally maintainable materialized view")));
if (rte->relkind == RELKIND_PARTITIONED_TABLE)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("partitioned table is not supported on incrementally maintainable materialized view")));
if (rte->relkind == RELKIND_RELATION && has_superclass(rte->relid))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("partitions is not supported on incrementally maintainable materialized view")));
if (rte->relkind == RELKIND_RELATION && find_inheritance_children(rte->relid, NoLock) != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("inheritance parent is not supported on incrementally maintainable materialized view")));
if (rte->relkind == RELKIND_FOREIGN_TABLE)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("foreign table is not supported on incrementally maintainable materialized view")));
if (rte->relkind == RELKIND_VIEW ||
rte->relkind == RELKIND_MATVIEW)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("VIEW or MATERIALIZED VIEW is not supported on incrementally maintainable materialized view")));
if (rte->rtekind == RTE_VALUES)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("VALUES is not supported on incrementally maintainable materialized view")));
if (rte->relkind == RELKIND_RELATION && isImmv(rte->relid))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("including IMMV in definition is not supported on incrementally maintainable materialized view")));
if (rte->rtekind == RTE_SUBQUERY)
{
context->sublevels_up++;
check_ivm_restriction_walker((Node *) rte->subquery, context);
context->sublevels_up--;
}
}
query_tree_walker(qry, check_ivm_restriction_walker, (void *) context, QTW_IGNORE_RT_SUBQUERIES);
/*
* additional restriction checks for exists subquery
*
* If the query has an EXISTS subquery and columns of a table in
* the outer query are used in the EXISTS subquery, those columns
* must be included in the target list. These columns are required
* to identify tuples in the view to be affected by modification
* of tables in the EXISTS subquery.
*/
if (context->exists_qual_vars != NIL && context->sublevels_up == 0)
{
foreach (lc, context->exists_qual_vars)
{
Var *var = (Var *) lfirst(lc);
ListCell *lc2;
bool found = false;
foreach(lc2, qry->targetList)
{
TargetEntry *tle = lfirst(lc2);
Var *var2;
if (!IsA(tle->expr, Var))
continue;
var2 = (Var *) tle->expr;
if (var->varno == var2->varno && var->varattno == var2->varattno)
{
found = true;
break;
}
}
if (!found)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("this query is not allowed on incrementally maintainable materialized view"),
errhint("targetlist must contain vars that are referred to in EXISTS subquery")));
}
}
break;
}
case T_CommonTableExpr:
{
CommonTableExpr *cte = (CommonTableExpr *) node;
if (isIvmName(cte->ctename))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("WITH query name %s is not supported on incrementally maintainable materialized view", cte->ctename)));
/*
* When a table in a unreferenced CTE is TRUNCATEd, the contents of the
* IMMV is not affected so it must not be truncated. For confirming it
* at the maintenance time, we have to check if the modified table used
* in a CTE is actually referenced. Although it would be possible, we