On Wed, Dec 30, 2020 at 12:33:56PM +0000, Simon Riggs wrote:
> There are no tests for the new functionality, please could you add some?
Did you look at the most recent patch?
+CREATE ACCESS METHOD heapdup TYPE TABLE HANDLER heap_tableam_handler;
+CREATE TABLE likeam() USING heapdup;
+CREATE TABLE likeamlike(LIKE likeam INCLUDING ALL);
Also, I just realized that Dilip's toast compression patch adds "INCLUDING
COMPRESSION", which is stored in pg_am. That's an implementation detail of
that patch, but it's not intuitive that "including access method" wouldn't
include the compression stored there. So I think this should use "INCLUDING
TABLE ACCESS METHOD" not just ACCESS METHOD.
--
Justin
>From f27fd6291aa10af1ca0be4bc72a656811c8e0c9f Mon Sep 17 00:00:00 2001
From: Justin Pryzby <[email protected]>
Date: Sun, 15 Nov 2020 16:54:53 -0600
Subject: [PATCH v3] create table (like .. including ACCESS METHOD)
---
doc/src/sgml/ref/create_table.sgml | 12 +++++++++++-
src/backend/parser/gram.y | 1 +
src/backend/parser/parse_utilcmd.c | 10 ++++++++++
src/include/nodes/parsenodes.h | 1 +
src/test/regress/expected/create_table_like.out | 12 ++++++++++++
src/test/regress/sql/create_table_like.sql | 8 ++++++++
6 files changed, 43 insertions(+), 1 deletion(-)
diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml
index 569f4c9da7..e3c607f6b1 100644
--- a/doc/src/sgml/ref/create_table.sgml
+++ b/doc/src/sgml/ref/create_table.sgml
@@ -87,7 +87,7 @@ class="parameter">referential_action</replaceable> ] [ ON UPDATE <replaceable cl
<phrase>and <replaceable class="parameter">like_option</replaceable> is:</phrase>
-{ INCLUDING | EXCLUDING } { COMMENTS | CONSTRAINTS | DEFAULTS | GENERATED | IDENTITY | INDEXES | STATISTICS | STORAGE | ALL }
+{ INCLUDING | EXCLUDING } { COMMENTS | CONSTRAINTS | DEFAULTS | GENERATED | IDENTITY | INDEXES | STATISTICS | STORAGE | TABLE ACCESS METHOD | ALL }
<phrase>and <replaceable class="parameter">partition_bound_spec</replaceable> is:</phrase>
@@ -689,6 +689,16 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><literal>INCLUDING TABLE ACCESS METHOD</literal></term>
+ <listitem>
+ <para>
+ The table's access method will be copied. By default, the
+ <literal>default_table_access_method</literal> is used.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term><literal>INCLUDING ALL</literal></term>
<listitem>
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 31c95443a5..719ac838e3 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3708,6 +3708,7 @@ TableLikeOption:
| INDEXES { $$ = CREATE_TABLE_LIKE_INDEXES; }
| STATISTICS { $$ = CREATE_TABLE_LIKE_STATISTICS; }
| STORAGE { $$ = CREATE_TABLE_LIKE_STORAGE; }
+ | TABLE ACCESS METHOD { $$ = CREATE_TABLE_LIKE_TABLE_ACCESS_METHOD; }
| ALL { $$ = CREATE_TABLE_LIKE_ALL; }
;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index b31f3afa03..f34f42aae3 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -96,6 +96,7 @@ typedef struct
bool ispartitioned; /* true if table is partitioned */
PartitionBoundSpec *partbound; /* transformed FOR VALUES */
bool ofType; /* true if statement contains OF typename */
+ char *accessMethod; /* table access method */
} CreateStmtContext;
/* State shared by transformCreateSchemaStmt and its subroutines */
@@ -252,6 +253,7 @@ transformCreateStmt(CreateStmt *stmt, const char *queryString)
cxt.ispartitioned = stmt->partspec != NULL;
cxt.partbound = stmt->partbound;
cxt.ofType = (stmt->ofTypename != NULL);
+ cxt.accessMethod = NULL;
Assert(!stmt->ofTypename || !stmt->inhRelations); /* grammar enforces */
@@ -346,6 +348,9 @@ transformCreateStmt(CreateStmt *stmt, const char *queryString)
stmt->tableElts = cxt.columns;
stmt->constraints = cxt.ckconstraints;
+ if (cxt.accessMethod != NULL)
+ stmt->accessMethod = cxt.accessMethod;
+
result = lappend(cxt.blist, stmt);
result = list_concat(result, cxt.alist);
result = list_concat(result, save_alist);
@@ -1118,6 +1123,11 @@ transformTableLikeClause(CreateStmtContext *cxt, TableLikeClause *table_like_cla
cxt->likeclauses = lappend(cxt->likeclauses, table_like_clause);
}
+ /* ACCESS METHOD doesn't apply and isn't copied for partitioned tables */
+ if ((table_like_clause->options & CREATE_TABLE_LIKE_TABLE_ACCESS_METHOD) != 0 &&
+ !cxt->ispartitioned)
+ cxt->accessMethod = get_am_name(relation->rd_rel->relam);
+
/*
* We may copy extended statistics if requested, since the representation
* of CreateStatsStmt doesn't depend on column numbers.
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h
index dc2bb40926..600856c229 100644
--- a/src/include/nodes/parsenodes.h
+++ b/src/include/nodes/parsenodes.h
@@ -685,6 +685,7 @@ typedef enum TableLikeOption
CREATE_TABLE_LIKE_INDEXES = 1 << 5,
CREATE_TABLE_LIKE_STATISTICS = 1 << 6,
CREATE_TABLE_LIKE_STORAGE = 1 << 7,
+ CREATE_TABLE_LIKE_TABLE_ACCESS_METHOD = 1 << 8,
CREATE_TABLE_LIKE_ALL = PG_INT32_MAX
} TableLikeOption;
diff --git a/src/test/regress/expected/create_table_like.out b/src/test/regress/expected/create_table_like.out
index 10d17be23c..a09cd48ed0 100644
--- a/src/test/regress/expected/create_table_like.out
+++ b/src/test/regress/expected/create_table_like.out
@@ -429,6 +429,18 @@ SELECT s.stxname, objsubid, description FROM pg_description, pg_statistic_ext s
ctlt_all_a_b_stat | 0 | ab stats
(1 row)
+CREATE ACCESS METHOD heapdup TYPE TABLE HANDLER heap_tableam_handler;
+CREATE TABLE likeam() USING heapdup;
+CREATE TABLE likeamlike(LIKE likeam INCLUDING ALL);
+-- pg_regress helpfully hides the Access Method output, which we need:
+SELECT a.amname FROM pg_class c JOIN pg_am a ON c.relam=a.oid WHERE c.oid='likeamlike'::regclass;
+ amname
+---------
+ heapdup
+(1 row)
+
+DROP TABLE likeam, likeamlike;
+DROP ACCESS METHOD heapdup;
CREATE TABLE inh_error1 () INHERITS (ctlt1, ctlt4);
NOTICE: merging multiple inherited definitions of column "a"
ERROR: inherited column "a" has a storage parameter conflict
diff --git a/src/test/regress/sql/create_table_like.sql b/src/test/regress/sql/create_table_like.sql
index 06b76f949d..ee6c464851 100644
--- a/src/test/regress/sql/create_table_like.sql
+++ b/src/test/regress/sql/create_table_like.sql
@@ -165,6 +165,14 @@ CREATE TABLE ctlt_all (LIKE ctlt1 INCLUDING ALL);
SELECT c.relname, objsubid, description FROM pg_description, pg_index i, pg_class c WHERE classoid = 'pg_class'::regclass AND objoid = i.indexrelid AND c.oid = i.indexrelid AND i.indrelid = 'ctlt_all'::regclass ORDER BY c.relname, objsubid;
SELECT s.stxname, objsubid, description FROM pg_description, pg_statistic_ext s WHERE classoid = 'pg_statistic_ext'::regclass AND objoid = s.oid AND s.stxrelid = 'ctlt_all'::regclass ORDER BY s.stxname, objsubid;
+CREATE ACCESS METHOD heapdup TYPE TABLE HANDLER heap_tableam_handler;
+CREATE TABLE likeam() USING heapdup;
+CREATE TABLE likeamlike(LIKE likeam INCLUDING ALL);
+-- pg_regress helpfully hides the Access Method output, which we need:
+SELECT a.amname FROM pg_class c JOIN pg_am a ON c.relam=a.oid WHERE c.oid='likeamlike'::regclass;
+DROP TABLE likeam, likeamlike;
+DROP ACCESS METHOD heapdup;
+
CREATE TABLE inh_error1 () INHERITS (ctlt1, ctlt4);
CREATE TABLE inh_error2 (LIKE ctlt4 INCLUDING STORAGE) INHERITS (ctlt1);
--
2.17.0
