List *ckconstraints; /* CHECK constraints */
List *fkconstraints; /* FOREIGN KEY constraints */
List *ixconstraints; /* index-creating constraints */
- List *inh_indexes; /* cloned indexes from INCLUDING INDEXES */
List *extstats; /* cloned extended statistics */
List *blist; /* "before list" of things to do before
* creating the table */
* Returns a List of utility commands to be done in sequence. One of these
* will be the transformed CreateStmt, but there may be additional actions
* to be done before and after the actual DefineRelation() call.
+ * In addition to normal utility commands such as AlterTableStmt and
+ * IndexStmt, the result list may contain TableLikeClause(s), representing
+ * the need to perform additional parse analysis after DefineRelation().
*
* SQL allows constraints to be scattered all over, so thumb through
* the columns and collect all constraints into one place.
cxt.ckconstraints = NIL;
cxt.fkconstraints = NIL;
cxt.ixconstraints = NIL;
- cxt.inh_indexes = NIL;
cxt.extstats = NIL;
cxt.blist = NIL;
cxt.alist = NIL;
* transformTableLikeClause
*
* Change the LIKE <srctable> portion of a CREATE TABLE statement into
- * column definitions which recreate the user defined column portions of
- * <srctable>.
+ * column definitions that recreate the user defined column portions of
+ * <srctable>. Also, if there are any LIKE options that we can't fully
+ * process at this point, add the TableLikeClause to cxt->alist, which
+ * will cause utility.c to call expandTableLikeClause() after the new
+ * table has been created.
*/
static void
transformTableLikeClause(CreateStmtContext *cxt, TableLikeClause *table_like_clause)
Relation relation;
TupleDesc tupleDesc;
TupleConstr *constr;
- AttrNumber *attmap;
AclResult aclresult;
char *comment;
ParseCallbackState pcbstate;
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("LIKE is not supported for creating foreign tables")));
+ /* Open the relation referenced by the LIKE clause */
relation = relation_openrv(table_like_clause->relation, AccessShareLock);
if (relation->rd_rel->relkind != RELKIND_RELATION &&
tupleDesc = RelationGetDescr(relation);
constr = tupleDesc->constr;
- /*
- * Initialize column number map for map_variable_attnos(). We need this
- * since dropped columns in the source table aren't copied, so the new
- * table can have different column numbers.
- */
- attmap = (AttrNumber *) palloc0(sizeof(AttrNumber) * tupleDesc->natts);
-
/*
* Insert the copied attributes into the cxt for the new table definition.
+ * We must do this now so that they appear in the table in the relative
+ * position where the LIKE clause is, as required by SQL99.
*/
for (parent_attno = 1; parent_attno <= tupleDesc->natts;
parent_attno++)
ColumnDef *def;
/*
- * Ignore dropped columns in the parent. attmap entry is left zero.
+ * Ignore dropped columns in the parent.
*/
if (attribute->attisdropped)
continue;
*/
cxt->columns = lappend(cxt->columns, def);
- attmap[parent_attno - 1] = list_length(cxt->columns);
-
/*
* Copy default, if present and the default has been requested
*/
/* We use oids if at least one LIKE'ed table has oids. */
cxt->hasoids |= relation->rd_rel->relhasoids;
+ /*
+ * We cannot yet deal with CHECK constraints or indexes, since we don't
+ * yet know what column numbers the copied columns will have in the
+ * finished table. If any of those options are specified, add the LIKE
+ * clause to cxt->alist so that expandTableLikeClause will be called after
+ * we do know that.
+ */
+ if (table_like_clause->options &
+ (CREATE_TABLE_LIKE_CONSTRAINTS |
+ CREATE_TABLE_LIKE_INDEXES))
+ cxt->alist = lappend(cxt->alist, table_like_clause);
+
+ /*
+ * We may copy extended statistics if requested, since the representation
+ * of CreateStatsStmt doesn't depend on column numbers.
+ */
+ if (table_like_clause->options & CREATE_TABLE_LIKE_STATISTICS)
+ {
+ List *parent_extstats;
+ ListCell *l;
+
+ parent_extstats = RelationGetStatExtList(relation);
+
+ foreach(l, parent_extstats)
+ {
+ Oid parent_stat_oid = lfirst_oid(l);
+ CreateStatsStmt *stats_stmt;
+
+ stats_stmt = generateClonedExtStatsStmt(cxt->relation,
+ RelationGetRelid(relation),
+ parent_stat_oid);
+
+ /* Copy comment on statistics object, if requested */
+ if (table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS)
+ {
+ comment = GetComment(parent_stat_oid, StatisticExtRelationId, 0);
+
+ /*
+ * We make use of CreateStatsStmt's stxcomment option, so as
+ * not to need to know now what name the statistics will have.
+ */
+ stats_stmt->stxcomment = comment;
+ }
+
+ cxt->extstats = lappend(cxt->extstats, stats_stmt);
+ }
+
+ list_free(parent_extstats);
+ }
+
+ /*
+ * Close the parent rel, but keep our AccessShareLock on it until xact
+ * commit. That will prevent someone else from deleting or ALTERing the
+ * parent before we can run expandTableLikeClause.
+ */
+ heap_close(relation, NoLock);
+}
+
+/*
+ * expandTableLikeClause
+ *
+ * Process LIKE options that require knowing the final column numbers
+ * assigned to the new table's columns. This executes after we have
+ * run DefineRelation for the new table. It returns a list of utility
+ * commands that should be run to generate indexes etc.
+ */
+List *
+expandTableLikeClause(RangeVar *heapRel, TableLikeClause *table_like_clause)
+{
+ List *result = NIL;
+ List *atsubcmds = NIL;
+ Relation relation;
+ Relation childrel;
+ TupleDesc tupleDesc;
+ TupleConstr *constr;
+ AttrNumber *attmap;
+ char *comment;
+
+ /*
+ * Open the relation referenced by the LIKE clause. We should still have
+ * the table lock obtained by transformTableLikeClause (and this'll throw
+ * an assertion failure if not). Hence, no need to recheck privileges
+ * etc.
+ */
+ relation = relation_openrv(table_like_clause->relation, NoLock);
+
+ tupleDesc = RelationGetDescr(relation);
+ constr = tupleDesc->constr;
+
+ /*
+ * Open the newly-created child relation; we have lock on that too.
+ */
+ childrel = relation_openrv(heapRel, NoLock);
+
+ /*
+ * Construct a map from the LIKE relation's attnos to the child rel's.
+ * This re-checks type match etc, although it shouldn't be possible to
+ * have a failure since both tables are locked.
+ */
+ attmap = convert_tuples_by_name_map(RelationGetDescr(childrel),
+ tupleDesc,
+ gettext_noop("could not convert row type"));
+
/*
* Copy CHECK constraints if requested, being careful to adjust attribute
* numbers so they match the child.
*/
if ((table_like_clause->options & CREATE_TABLE_LIKE_CONSTRAINTS) &&
- tupleDesc->constr)
+ constr != NULL)
{
int ccnum;
- for (ccnum = 0; ccnum < tupleDesc->constr->num_check; ccnum++)
+ for (ccnum = 0; ccnum < constr->num_check; ccnum++)
{
- char *ccname = tupleDesc->constr->check[ccnum].ccname;
- char *ccbin = tupleDesc->constr->check[ccnum].ccbin;
- Constraint *n = makeNode(Constraint);
+ char *ccname = constr->check[ccnum].ccname;
+ char *ccbin = constr->check[ccnum].ccbin;
Node *ccbin_node;
bool found_whole_row;
+ Constraint *n;
+ AlterTableCmd *atsubcmd;
ccbin_node = map_variable_attnos(stringToNode(ccbin),
1, 0,
ccname,
RelationGetRelationName(relation))));
+ n = makeNode(Constraint);
n->contype = CONSTR_CHECK;
n->location = -1;
n->conname = pstrdup(ccname);
n->raw_expr = NULL;
n->cooked_expr = nodeToString(ccbin_node);
- cxt->ckconstraints = lappend(cxt->ckconstraints, n);
+
+ /* We can skip validation, since the new table should be empty. */
+ n->skip_validation = true;
+ n->initially_valid = true;
+
+ atsubcmd = makeNode(AlterTableCmd);
+ atsubcmd->subtype = AT_AddConstraint;
+ atsubcmd->def = (Node *) n;
+ atsubcmds = lappend(atsubcmds, atsubcmd);
/* Copy comment on constraint */
if ((table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS) &&
CommentStmt *stmt = makeNode(CommentStmt);
stmt->objtype = OBJECT_TABCONSTRAINT;
- stmt->object = (Node *) list_make3(makeString(cxt->relation->schemaname),
- makeString(cxt->relation->relname),
+ stmt->object = (Node *) list_make3(makeString(heapRel->schemaname),
+ makeString(heapRel->relname),
makeString(n->conname));
stmt->comment = comment;
- cxt->alist = lappend(cxt->alist, stmt);
+ result = lappend(result, stmt);
}
}
}
/*
- * Likewise, copy indexes if requested
+ * If we generated any ALTER TABLE actions above, wrap them into a single
+ * ALTER TABLE command. Stick it at the front of the result, so it runs
+ * before any CommentStmts we made above.
+ */
+ if (atsubcmds)
+ {
+ AlterTableStmt *atcmd = makeNode(AlterTableStmt);
+
+ atcmd->relation = copyObject(heapRel);
+ atcmd->cmds = atsubcmds;
+ atcmd->relkind = OBJECT_TABLE;
+ atcmd->missing_ok = false;
+ result = lcons(atcmd, result);
+ }
+
+ /*
+ * Process indexes if required.
*/
if ((table_like_clause->options & CREATE_TABLE_LIKE_INDEXES) &&
relation->rd_rel->relhasindex)
parent_index = index_open(parent_index_oid, AccessShareLock);
/* Build CREATE INDEX statement to recreate the parent_index */
- index_stmt = generateClonedIndexStmt(cxt->relation, InvalidOid,
+ index_stmt = generateClonedIndexStmt(heapRel, InvalidOid,
parent_index,
attmap, tupleDesc->natts, NULL);
index_stmt->idxcomment = comment;
}
- /* Save it in the inh_indexes list for the time being */
- cxt->inh_indexes = lappend(cxt->inh_indexes, index_stmt);
+ result = lappend(result, index_stmt);
index_close(parent_index, AccessShareLock);
}
}
- /*
- * Likewise, copy extended statistics if requested
- */
- if (table_like_clause->options & CREATE_TABLE_LIKE_STATISTICS)
- {
- List *parent_extstats;
- ListCell *l;
-
- parent_extstats = RelationGetStatExtList(relation);
-
- foreach(l, parent_extstats)
- {
- Oid parent_stat_oid = lfirst_oid(l);
- CreateStatsStmt *stats_stmt;
-
- stats_stmt = generateClonedExtStatsStmt(cxt->relation,
- RelationGetRelid(relation),
- parent_stat_oid);
-
- /* Copy comment on statistics object, if requested */
- if (table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS)
- {
- comment = GetComment(parent_stat_oid, StatisticExtRelationId, 0);
-
- /*
- * We make use of CreateStatsStmt's stxcomment option, so as
- * not to need to know now what name the statistics will have.
- */
- stats_stmt->stxcomment = comment;
- }
-
- cxt->extstats = lappend(cxt->extstats, stats_stmt);
- }
-
- list_free(parent_extstats);
- }
+ /* Done with child rel */
+ heap_close(childrel, NoLock);
/*
* Close the parent rel, but keep our AccessShareLock on it until xact
* parent before the child is committed.
*/
heap_close(relation, NoLock);
+
+ return result;
}
static void
indexlist = lappend(indexlist, index);
}
- /* Add in any indexes defined by LIKE ... INCLUDING INDEXES */
- foreach(lc, cxt->inh_indexes)
- {
- index = (IndexStmt *) lfirst(lc);
-
- if (index->primary)
- {
- if (cxt->pkey != NULL)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
- errmsg("multiple primary keys for table \"%s\" are not allowed",
- cxt->relation->relname)));
- cxt->pkey = index;
- }
-
- indexlist = lappend(indexlist, index);
- }
-
/*
* Scan the index list and remove any redundant index specifications. This
* can happen if, for instance, the user writes UNIQUE PRIMARY KEY. A
cxt.ckconstraints = NIL;
cxt.fkconstraints = NIL;
cxt.ixconstraints = NIL;
- cxt.inh_indexes = NIL;
cxt.extstats = NIL;
cxt.blist = NIL;
cxt.alist = NIL;
(1 row)
DROP TABLE test_like_id_1, test_like_id_2, test_like_id_3;
+-- Test renumbering of Vars when combining LIKE with inheritance
+CREATE TABLE test_like_4 (b int DEFAULT 42,
+ c int NOT NULL,
+ a int CHECK (a > 0));
+CREATE TABLE test_like_5 (x point, y point, z point);
+CREATE TABLE test_like_5x (p int CHECK (p > 0),
+ q int DEFAULT 99);
+CREATE TABLE test_like_5c (LIKE test_like_4 INCLUDING ALL)
+ INHERITS (test_like_5, test_like_5x);
+\d test_like_5c
+ Table "public.test_like_5c"
+ Column | Type | Collation | Nullable | Default
+--------+---------+-----------+----------+---------
+ x | point | | |
+ y | point | | |
+ z | point | | |
+ p | integer | | |
+ q | integer | | | 99
+ b | integer | | | 42
+ c | integer | | not null |
+ a | integer | | |
+Check constraints:
+ "test_like_4_a_check" CHECK (a > 0)
+ "test_like_5x_p_check" CHECK (p > 0)
+Inherits: test_like_5,
+ test_like_5x
+
+DROP TABLE test_like_4;
+DROP TABLE test_like_5, test_like_5x, test_like_5c;
CREATE TABLE inhg (x text, LIKE inhx INCLUDING INDEXES, y text); /* copies indexes */
INSERT INTO inhg VALUES (5, 10);
INSERT INTO inhg VALUES (20, 10); -- should fail
CREATE TABLE ctlt2 (c text);
ALTER TABLE ctlt2 ALTER COLUMN c SET STORAGE EXTERNAL;
COMMENT ON COLUMN ctlt2.c IS 'C';
-CREATE TABLE ctlt3 (a text CHECK (length(a) < 5), c text);
+CREATE TABLE ctlt3 (a text CHECK (length(a) < 5), c text CHECK (length(c) < 7));
ALTER TABLE ctlt3 ALTER COLUMN c SET STORAGE EXTERNAL;
ALTER TABLE ctlt3 ALTER COLUMN a SET STORAGE MAIN;
+CREATE INDEX ctlt3_fnidx ON ctlt3 ((a || c));
COMMENT ON COLUMN ctlt3.a IS 'A3';
COMMENT ON COLUMN ctlt3.c IS 'C';
COMMENT ON CONSTRAINT ctlt3_a_check ON ctlt3 IS 't3_a_check';
Check constraints:
"ctlt1_a_check" CHECK (length(a) > 2)
"ctlt3_a_check" CHECK (length(a) < 5)
+ "ctlt3_c_check" CHECK (length(c) < 7)
Inherits: ctlt1,
ctlt3
-CREATE TABLE ctlt13_like (LIKE ctlt3 INCLUDING CONSTRAINTS INCLUDING COMMENTS INCLUDING STORAGE) INHERITS (ctlt1);
+CREATE TABLE ctlt13_like (LIKE ctlt3 INCLUDING CONSTRAINTS INCLUDING INDEXES INCLUDING COMMENTS INCLUDING STORAGE) INHERITS (ctlt1);
NOTICE: merging column "a" with inherited definition
\d+ ctlt13_like
Table "public.ctlt13_like"
a | text | | not null | | main | | A3
b | text | | | | extended | |
c | text | | | | external | | C
+Indexes:
+ "ctlt13_like_expr_idx" btree ((a || c))
Check constraints:
"ctlt1_a_check" CHECK (length(a) > 2)
"ctlt3_a_check" CHECK (length(a) < 5)
+ "ctlt3_c_check" CHECK (length(c) < 7)
Inherits: ctlt1
SELECT description FROM pg_description, pg_constraint c WHERE classoid = 'pg_constraint'::regclass AND objoid = c.oid AND c.conrelid = 'ctlt13_like'::regclass;
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