Prohibit identity columns on typed tables and partitions

Those cases currently crash and supporting them is more work then
originally thought, so we'll just prohibit these scenarios for now.

Author: Michael Paquier <michael.paquier@gmail.com>
Reviewed-by: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>
Reported-by: Мансур Галиев <gomer94@yandex.ru>
Bug: #14866

src/backend/parser/parse_utilcmd.c

@@ -92,6 +92,7 @@ typedef struct
 	IndexStmt  *pkey;			/* PRIMARY KEY index, if any */
 	bool		ispartitioned;	/* true if table is partitioned */
 	PartitionBoundSpec *partbound;	/* transformed FOR VALUES */
+	bool		ofType;			/* true if statement contains OF typename */
 } CreateStmtContext;
 
 /* State shared by transformCreateSchemaStmt and its subroutines */
@@ -240,6 +241,8 @@ transformCreateStmt(CreateStmt *stmt, const char *queryString)
 	cxt.alist = NIL;
 	cxt.pkey = NULL;
 	cxt.ispartitioned = stmt->partspec != NULL;
+	cxt.partbound = stmt->partbound;
+	cxt.ofType = (stmt->ofTypename != NULL);
 
 	/*
 	 * Notice that we allow OIDs here only for plain tables, even though
@@ -662,6 +665,15 @@ transformColumnDefinition(CreateStmtContext *cxt, ColumnDef *column)
 					Type		ctype;
 					Oid			typeOid;
 
+					if (cxt->ofType)
+						ereport(ERROR,
+									(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+									 errmsg("identity colums are not supported on typed tables")));
+					if (cxt->partbound)
+						ereport(ERROR,
+								(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+								 errmsg("identify columns are not supported on partitions")));
+
 					ctype = typenameType(cxt->pstate, column->typeName, NULL);
 					typeOid = HeapTupleGetOid(ctype);
 					ReleaseSysCache(ctype);
@@ -2697,6 +2709,7 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
 	cxt.pkey = NULL;
 	cxt.ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
 	cxt.partbound = NULL;
+	cxt.ofType = false;
 
 	/*
 	 * The only subtypes that currently require parse transformation handling

src/test/regress/expected/identity.out

@@ -346,3 +346,15 @@ SELECT * FROM itest8;
 RESET ROLE;
 DROP TABLE itest8;
 DROP USER regress_user1;
+-- typed tables (currently not supported)
+CREATE TYPE itest_type AS (f1 integer, f2 text, f3 bigint);
+CREATE TABLE itest12 OF itest_type (f1 WITH OPTIONS GENERATED ALWAYS AS IDENTITY); -- error
+ERROR:  identity colums are not supported on typed tables
+DROP TYPE itest_type CASCADE;
+-- table partitions (currently not supported)
+CREATE TABLE itest_parent (f1 date NOT NULL, f2 text, f3 bigint) PARTITION BY RANGE (f1);
+CREATE TABLE itest_child PARTITION OF itest_parent (
+    f3 WITH OPTIONS GENERATED ALWAYS AS IDENTITY
+) FOR VALUES FROM ('2016-07-01') TO ('2016-08-01'); -- error
+ERROR:  identify columns are not supported on partitions
+DROP TABLE itest_parent;

src/test/regress/sql/identity.sql

@@ -211,3 +211,19 @@ SELECT * FROM itest8;
 RESET ROLE;
 DROP TABLE itest8;
 DROP USER regress_user1;
+
+
+-- typed tables (currently not supported)
+
+CREATE TYPE itest_type AS (f1 integer, f2 text, f3 bigint);
+CREATE TABLE itest12 OF itest_type (f1 WITH OPTIONS GENERATED ALWAYS AS IDENTITY); -- error
+DROP TYPE itest_type CASCADE;
+
+
+-- table partitions (currently not supported)
+
+CREATE TABLE itest_parent (f1 date NOT NULL, f2 text, f3 bigint) PARTITION BY RANGE (f1);
+CREATE TABLE itest_child PARTITION OF itest_parent (
+    f3 WITH OPTIONS GENERATED ALWAYS AS IDENTITY
+) FOR VALUES FROM ('2016-07-01') TO ('2016-08-01'); -- error
+DROP TABLE itest_parent;