diff --git a/doc/src/sgml/ref/copy.sgml b/doc/src/sgml/ref/copy.sgml
index 8433344e5b6f..d750a2fef7c6 100644
--- a/doc/src/sgml/ref/copy.sgml
+++ b/doc/src/sgml/ref/copy.sgml
@@ -521,13 +521,13 @@ COPY count
COPY TO can be used with plain
- tables and populated materialized views.
- For example,
+ tables, populated materialized views and partitioned tables.
+ For example, if table is not partitioned table,
COPY table
TO copies the same rows as
SELECT * FROM ONLY table.
However it doesn't directly support other relation types,
- such as partitioned tables, inheritance child tables, or views.
+ such as inheritance child tables, or views.
To copy all rows from such relations, use COPY (SELECT * FROM
table) TO.
diff --git a/src/backend/commands/copyto.c b/src/backend/commands/copyto.c
index f87e405351d1..5f6cf92f86eb 100644
--- a/src/backend/commands/copyto.c
+++ b/src/backend/commands/copyto.c
@@ -19,6 +19,8 @@
#include
#include "access/tableam.h"
+#include "access/table.h"
+#include "catalog/pg_inherits.h"
#include "commands/copyapi.h"
#include "commands/progress.h"
#include "executor/execdesc.h"
@@ -82,6 +84,7 @@ typedef struct CopyToStateData
List *attnumlist; /* integer list of attnums to copy */
char *filename; /* filename, or NULL for STDOUT */
bool is_program; /* is 'filename' a program to popen? */
+ List *partitions; /* oid list of partition oid for copy to */
copy_data_dest_cb data_dest_cb; /* function for writing data */
CopyFormatOptions opts;
@@ -116,6 +119,8 @@ static void CopyOneRowTo(CopyToState cstate, TupleTableSlot *slot);
static void CopyAttributeOutText(CopyToState cstate, const char *string);
static void CopyAttributeOutCSV(CopyToState cstate, const char *string,
bool use_quote);
+static void CopyThisRelTo(CopyToState cstate, Relation rel,
+ Relation root_rel, uint64 *processed);
/* built-in format-specific routines */
static void CopyToTextLikeStart(CopyToState cstate, TupleDesc tupDesc);
@@ -643,6 +648,8 @@ BeginCopyTo(ParseState *pstate,
PROGRESS_COPY_COMMAND_TO,
0
};
+ List *children = NIL;
+ List *scan_oids = NIL;
if (rel != NULL && rel->rd_rel->relkind != RELKIND_RELATION)
{
@@ -673,11 +680,35 @@ BeginCopyTo(ParseState *pstate,
errmsg("cannot copy from sequence \"%s\"",
RelationGetRelationName(rel))));
else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
- ereport(ERROR,
- (errcode(ERRCODE_WRONG_OBJECT_TYPE),
- errmsg("cannot copy from partitioned table \"%s\"",
- RelationGetRelationName(rel)),
- errhint("Try the COPY (SELECT ...) TO variant.")));
+ {
+ children = find_all_inheritors(RelationGetRelid(rel),
+ AccessShareLock,
+ NULL);
+
+ foreach_oid(childreloid, children)
+ {
+ char relkind = get_rel_relkind(childreloid);
+
+ if (relkind == RELKIND_FOREIGN_TABLE)
+ {
+ char *relation_name;
+
+ relation_name = get_rel_name(childreloid);
+ ereport(ERROR,
+ errcode(ERRCODE_WRONG_OBJECT_TYPE),
+ errmsg("cannot copy from foreign table \"%s\"", relation_name),
+ errdetail("Partition \"%s\" is a foreign table in the partitioned table \"%s.%s\"",
+ relation_name, RelationGetRelationName(rel),
+ get_namespace_name(rel->rd_rel->relnamespace)),
+ errhint("Try the COPY (SELECT ...) TO variant."));
+ }
+
+ if (RELKIND_HAS_PARTITIONS(relkind))
+ continue;
+
+ scan_oids = lappend_oid(scan_oids, childreloid);
+ }
+ }
else
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
@@ -713,6 +744,7 @@ BeginCopyTo(ParseState *pstate,
cstate->rel = rel;
tupDesc = RelationGetDescr(cstate->rel);
+ cstate->partitions = list_copy(scan_oids);
}
else
{
@@ -1031,7 +1063,7 @@ DoCopyTo(CopyToState cstate)
TupleDesc tupDesc;
int num_phys_attrs;
ListCell *cur;
- uint64 processed;
+ uint64 processed = 0;
if (fe_copy)
SendCopyBegin(cstate);
@@ -1069,36 +1101,25 @@ DoCopyTo(CopyToState cstate)
cstate->routine->CopyToStart(cstate, tupDesc);
- if (cstate->rel)
+ /*
+ * if COPY TO source table is a partitioned table, then open each
+ * partition and process each individual partition.
+ */
+ if (cstate->rel && cstate->rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
{
- TupleTableSlot *slot;
- TableScanDesc scandesc;
-
- scandesc = table_beginscan(cstate->rel, GetActiveSnapshot(), 0, NULL);
- slot = table_slot_create(cstate->rel, NULL);
-
- processed = 0;
- while (table_scan_getnextslot(scandesc, ForwardScanDirection, slot))
+ foreach_oid(scan_oid, cstate->partitions)
{
- CHECK_FOR_INTERRUPTS();
+ Relation scan_rel;
- /* Deconstruct the tuple ... */
- slot_getallattrs(slot);
+ scan_rel = table_open(scan_oid, AccessShareLock);
- /* Format and send the data */
- CopyOneRowTo(cstate, slot);
+ CopyThisRelTo(cstate, scan_rel, cstate->rel, &processed);
- /*
- * Increment the number of processed tuples, and report the
- * progress.
- */
- pgstat_progress_update_param(PROGRESS_COPY_TUPLES_PROCESSED,
- ++processed);
+ table_close(scan_rel, AccessShareLock);
}
-
- ExecDropSingleTupleTableSlot(slot);
- table_endscan(scandesc);
}
+ else if (cstate->rel)
+ CopyThisRelTo(cstate, cstate->rel, NULL, &processed);
else
{
/* run the plan --- the dest receiver will send tuples */
@@ -1116,6 +1137,71 @@ DoCopyTo(CopyToState cstate)
return processed;
}
+/*
+ * rel: the relation from which the actual data will be copied.
+ * root_rel: if not NULL, it indicates that we are copying partitioned relation
+ * data to the destination, and "rel" is the partition of "root_rel".
+ * processed: number of tuples processed.
+*/
+static void
+CopyThisRelTo(CopyToState cstate, Relation rel, Relation root_rel,
+ uint64 *processed)
+{
+ TupleTableSlot *slot;
+ TableScanDesc scandesc;
+ AttrMap *map = NULL;
+ TupleTableSlot *root_slot = NULL;
+ TupleTableSlot *original_slot = NULL;
+ TupleDesc scan_tupdesc;
+ TupleDesc rootdesc = NULL;
+
+ scan_tupdesc = RelationGetDescr(rel);
+ scandesc = table_beginscan(rel, GetActiveSnapshot(), 0, NULL);
+ slot = table_slot_create(rel, NULL);
+
+ /*
+ * A partition's rowtype might differ from the root table's.
+ * Since we are export partitioned table data here,
+ * we must convert it back to the root table's rowtype.
+ */
+ if (root_rel != NULL)
+ {
+ rootdesc = RelationGetDescr(root_rel);
+ map = build_attrmap_by_name_if_req(rootdesc, scan_tupdesc, false);
+ }
+
+ while (table_scan_getnextslot(scandesc, ForwardScanDirection, slot))
+ {
+ CHECK_FOR_INTERRUPTS();
+
+ /* Deconstruct the tuple ... */
+ if (map != NULL)
+ {
+ original_slot = slot;
+ root_slot = MakeSingleTupleTableSlot(rootdesc, &TTSOpsBufferHeapTuple);
+ slot = execute_attr_map_slot(map, slot, root_slot);
+ }
+ else
+ slot_getallattrs(slot);
+
+ /* Format and send the data */
+ CopyOneRowTo(cstate, slot);
+
+ /*
+ * Increment the number of processed tuples, and report the
+ * progress.
+ */
+ pgstat_progress_update_param(PROGRESS_COPY_TUPLES_PROCESSED,
+ ++(*processed));
+
+ if (original_slot != NULL)
+ ExecDropSingleTupleTableSlot(original_slot);
+ }
+
+ ExecDropSingleTupleTableSlot(slot);
+ table_endscan(scandesc);
+}
+
/*
* Emit one row during DoCopyTo().
*/
diff --git a/src/test/regress/expected/copy.out b/src/test/regress/expected/copy.out
index 8d5a06563c44..05e5649c1bc9 100644
--- a/src/test/regress/expected/copy.out
+++ b/src/test/regress/expected/copy.out
@@ -350,3 +350,21 @@ COPY copytest_mv(id) TO stdout WITH (header);
id
1
DROP MATERIALIZED VIEW copytest_mv;
+-- Tests for COPY TO with partitioned tables.
+CREATE TABLE pp (id int,val int) PARTITION BY RANGE (id);
+CREATE TABLE pp_1 (val int, id int) PARTITION BY RANGE (id);
+CREATE TABLE pp_2 (val int, id int) PARTITION BY RANGE (id);
+ALTER TABLE pp ATTACH PARTITION pp_1 FOR VALUES FROM (1) TO (5);
+ALTER TABLE pp ATTACH PARTITION pp_2 FOR VALUES FROM (5) TO (10);
+CREATE TABLE pp_15 PARTITION OF pp_1 FOR VALUES FROM (1) TO (5);
+CREATE TABLE pp_510 PARTITION OF pp_2 FOR VALUES FROM (5) TO (10);
+INSERT INTO pp SELECT g, 10 + g FROM generate_series(1,6) g;
+COPY pp TO stdout(header);
+id val
+1 11
+2 12
+3 13
+4 14
+5 15
+6 16
+DROP TABLE PP;
diff --git a/src/test/regress/sql/copy.sql b/src/test/regress/sql/copy.sql
index f0b88a23db85..fd2627deefaf 100644
--- a/src/test/regress/sql/copy.sql
+++ b/src/test/regress/sql/copy.sql
@@ -375,3 +375,18 @@ COPY copytest_mv(id) TO stdout WITH (header);
REFRESH MATERIALIZED VIEW copytest_mv;
COPY copytest_mv(id) TO stdout WITH (header);
DROP MATERIALIZED VIEW copytest_mv;
+
+-- Tests for COPY TO with partitioned tables.
+CREATE TABLE pp (id int,val int) PARTITION BY RANGE (id);
+CREATE TABLE pp_1 (val int, id int) PARTITION BY RANGE (id);
+CREATE TABLE pp_2 (val int, id int) PARTITION BY RANGE (id);
+ALTER TABLE pp ATTACH PARTITION pp_1 FOR VALUES FROM (1) TO (5);
+ALTER TABLE pp ATTACH PARTITION pp_2 FOR VALUES FROM (5) TO (10);
+
+CREATE TABLE pp_15 PARTITION OF pp_1 FOR VALUES FROM (1) TO (5);
+CREATE TABLE pp_510 PARTITION OF pp_2 FOR VALUES FROM (5) TO (10);
+
+INSERT INTO pp SELECT g, 10 + g FROM generate_series(1,6) g;
+
+COPY pp TO stdout(header);
+DROP TABLE PP;
\ No newline at end of file