(3 rows)
DELETE FROM result_tbl;
+-- Test COPY TO when foreign table is partition
+COPY async_pt TO stdout; --error
+ERROR: cannot copy from foreign table "async_p1"
+DETAIL: Partition "async_p1" is a foreign table in partitioned table "async_pt"
+HINT: Try the COPY (SELECT ...) TO variant.
DROP FOREIGN TABLE async_p3;
DROP TABLE base_tbl3;
-- Check case where the partitioned table has local/remote partitions
SELECT * FROM result_tbl ORDER BY a;
DELETE FROM result_tbl;
+-- Test COPY TO when foreign table is partition
+COPY async_pt TO stdout; --error
+
DROP FOREIGN TABLE async_p3;
DROP TABLE base_tbl3;
<para>
<command>COPY TO</command> can be used with plain
- tables and populated materialized views.
- For example,
- <literal>COPY <replaceable class="parameter">table</replaceable>
- TO</literal> copies the same rows as
+ tables, populated materialized views, and partitioned tables.
+ For non-partitioned tables, COPY <replaceable class="parameter">table</replaceable>
+ copies the same rows as
<literal>SELECT * FROM ONLY <replaceable class="parameter">table</replaceable></literal>.
+ For partitioned tables, it copies the same rows as
+ <literal>SELECT * FROM <replaceable class="parameter">table</replaceable></literal>.
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 <literal>COPY (SELECT * FROM
<replaceable class="parameter">table</replaceable>) TO</literal>.
</para>
* relation which we have opened and locked. Use "ONLY" so that
* COPY retrieves rows from only the target table not any
* inheritance children, the same as when RLS doesn't apply.
+ *
+ * However, when copying data from a partitioned table, we don't
+ * use "ONLY", since we need to retrieve rows from its descendant
+ * tables too.
*/
from = makeRangeVar(get_namespace_name(RelationGetNamespace(rel)),
pstrdup(RelationGetRelationName(rel)),
-1);
- from->inh = false; /* apply ONLY */
+ from->inh = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
/* Build query */
select = makeNode(SelectStmt);
#include <unistd.h>
#include <sys/stat.h>
+#include "access/table.h"
#include "access/tableam.h"
+#include "catalog/pg_inherits.h"
#include "commands/copyapi.h"
#include "commands/progress.h"
#include "executor/execdesc.h"
CopyFormatOptions opts;
Node *whereClause; /* WHERE condition (or NULL) */
+ List *partitions; /* OID list of partitions to copy data from */
/*
* Working state
static void CopyAttributeOutText(CopyToState cstate, const char *string);
static void CopyAttributeOutCSV(CopyToState cstate, const char *string,
bool use_quote);
+static void CopyRelationTo(CopyToState cstate, Relation rel, Relation root_rel,
+ uint64 *processed);
/* built-in format-specific routines */
static void CopyToTextLikeStart(CopyToState cstate, TupleDesc tupDesc);
pgstat_progress_end_command();
MemoryContextDelete(cstate->copycontext);
+
+ if (cstate->partitions)
+ list_free(cstate->partitions);
+
pfree(cstate);
}
PROGRESS_COPY_COMMAND_TO,
0
};
+ List *children = NIL;
if (rel != NULL && rel->rd_rel->relkind != RELKIND_RELATION)
{
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.")));
+ {
+ /*
+ * Collect OIDs of relation containing data, so that later
+ * DoCopyTo can copy the data from them.
+ */
+ children = find_all_inheritors(RelationGetRelid(rel), AccessShareLock, NULL);
+
+ foreach_oid(child, children)
+ {
+ char relkind = get_rel_relkind(child);
+
+ if (relkind == RELKIND_FOREIGN_TABLE)
+ {
+ char *relation_name = get_rel_name(child);
+
+ ereport(ERROR,
+ errcode(ERRCODE_WRONG_OBJECT_TYPE),
+ errmsg("cannot copy from foreign table \"%s\"", relation_name),
+ errdetail("Partition \"%s\" is a foreign table in partitioned table \"%s\"",
+ relation_name, RelationGetRelationName(rel)),
+ errhint("Try the COPY (SELECT ...) TO variant."));
+ }
+
+ /* Exclude tables with no data */
+ if (RELKIND_HAS_PARTITIONS(relkind))
+ children = foreach_delete_current(children, child);
+ }
+ }
else
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
cstate->rel = rel;
tupDesc = RelationGetDescr(cstate->rel);
+ cstate->partitions = children;
}
else
{
DestReceiver *dest;
cstate->rel = NULL;
+ cstate->partitions = NIL;
/*
* Run parse analysis and rewrite. Note this also acquires sufficient
TupleDesc tupDesc;
int num_phys_attrs;
ListCell *cur;
- uint64 processed;
+ uint64 processed = 0;
if (fe_copy)
SendCopyBegin(cstate);
if (cstate->rel)
{
- 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))
+ /*
+ * If COPY TO source table is a partitioned table, then open each
+ * partition and process each individual partition.
+ */
+ if (cstate->rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
{
- CHECK_FOR_INTERRUPTS();
-
- /* Deconstruct the tuple ... */
- slot_getallattrs(slot);
-
- /* Format and send the data */
- CopyOneRowTo(cstate, slot);
+ foreach_oid(child, cstate->partitions)
+ {
+ Relation scan_rel;
- /*
- * Increment the number of processed tuples, and report the
- * progress.
- */
- pgstat_progress_update_param(PROGRESS_COPY_TUPLES_PROCESSED,
- ++processed);
+ /* We already got the lock in BeginCopyTo */
+ scan_rel = table_open(child, NoLock);
+ CopyRelationTo(cstate, scan_rel, cstate->rel, &processed);
+ table_close(scan_rel, NoLock);
+ }
}
-
- ExecDropSingleTupleTableSlot(slot);
- table_endscan(scandesc);
+ else
+ CopyRelationTo(cstate, cstate->rel, NULL, &processed);
}
else
{
return processed;
}
+/*
+ * Scans a single table and exports its rows to the COPY destination.
+ *
+ * root_rel can be set to the root table of rel if rel is a partition
+ * table so that we can send tuples in root_rel's rowtype, which might
+ * differ from individual partitions.
+*/
+static void
+CopyRelationTo(CopyToState cstate, Relation rel, Relation root_rel, uint64 *processed)
+{
+ TupleTableSlot *slot;
+ TableScanDesc scandesc;
+ AttrMap *map = NULL;
+ TupleTableSlot *root_slot = NULL;
+
+ scandesc = table_beginscan(rel, GetActiveSnapshot(), 0, NULL);
+ slot = table_slot_create(rel, NULL);
+
+ /*
+ * If we are exporting partition data here, we check if converting tuples
+ * to the root table's rowtype, because a partition might have column
+ * order different than its root table.
+ */
+ if (root_rel != NULL)
+ {
+ root_slot = table_slot_create(root_rel, NULL);
+ map = build_attrmap_by_name_if_req(RelationGetDescr(root_rel),
+ RelationGetDescr(rel),
+ false);
+ }
+
+ while (table_scan_getnextslot(scandesc, ForwardScanDirection, slot))
+ {
+ TupleTableSlot *copyslot;
+
+ CHECK_FOR_INTERRUPTS();
+
+ if (map != NULL)
+ copyslot = execute_attr_map_slot(map, slot, root_slot);
+ else
+ {
+ /* Deconstruct the tuple */
+ slot_getallattrs(slot);
+ copyslot = slot;
+ }
+
+ /* Format and send the data */
+ CopyOneRowTo(cstate, copyslot);
+
+ /*
+ * Increment the number of processed tuples, and report the progress.
+ */
+ pgstat_progress_update_param(PROGRESS_COPY_TUPLES_PROCESSED,
+ ++(*processed));
+ }
+
+ ExecDropSingleTupleTableSlot(slot);
+
+ if (root_slot != NULL)
+ ExecDropSingleTupleTableSlot(root_slot);
+
+ if (map != NULL)
+ free_attrmap(map);
+
+ table_endscan(scandesc);
+}
+
/*
* Emit one row during DoCopyTo().
*/
id
1
DROP MATERIALIZED VIEW copytest_mv;
+-- Tests for COPY TO with partitioned tables.
+-- The child table pp_2 has a different column order than the root table pp.
+-- Check if COPY TO exports tuples as the root table's column order.
+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 (id int, val 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;
9 | 11 | 1 | regress_rls_dave | awesome science fiction
(4 rows)
+COPY part_document TO stdout WITH (DELIMITER ',');
+1,11,1,regress_rls_bob,my first novel
+6,11,1,regress_rls_carol,great science fiction
+9,11,1,regress_rls_dave,awesome science fiction
+4,55,1,regress_rls_bob,my first satire
EXPLAIN (COSTS OFF) SELECT * FROM part_document WHERE f_leak(dtitle);
QUERY PLAN
-------------------------------------------------------------------------
10 | 99 | 2 | regress_rls_dave | awesome technology book
(10 rows)
+COPY part_document TO stdout WITH (DELIMITER ',');
+1,11,1,regress_rls_bob,my first novel
+2,11,2,regress_rls_bob,my second novel
+6,11,1,regress_rls_carol,great science fiction
+9,11,1,regress_rls_dave,awesome science fiction
+4,55,1,regress_rls_bob,my first satire
+8,55,2,regress_rls_carol,great satire
+3,99,2,regress_rls_bob,my science textbook
+5,99,2,regress_rls_bob,my history book
+7,99,2,regress_rls_carol,great technology book
+10,99,2,regress_rls_dave,awesome technology book
EXPLAIN (COSTS OFF) SELECT * FROM part_document WHERE f_leak(dtitle);
QUERY PLAN
-------------------------------------------------------------------------
9 | 11 | 1 | regress_rls_dave | awesome science fiction
(4 rows)
+COPY part_document TO stdout WITH (DELIMITER ',');
+1,11,1,regress_rls_bob,my first novel
+2,11,2,regress_rls_bob,my second novel
+6,11,1,regress_rls_carol,great science fiction
+9,11,1,regress_rls_dave,awesome science fiction
EXPLAIN (COSTS OFF) SELECT * FROM part_document WHERE f_leak(dtitle);
QUERY PLAN
----------------------------------------------------------------------------------
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.
+-- The child table pp_2 has a different column order than the root table pp.
+-- Check if COPY TO exports tuples as the root table's column order.
+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 (id int, val 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;
SET SESSION AUTHORIZATION regress_rls_bob;
SET row_security TO ON;
SELECT * FROM part_document WHERE f_leak(dtitle) ORDER BY did;
+COPY part_document TO stdout WITH (DELIMITER ',');
EXPLAIN (COSTS OFF) SELECT * FROM part_document WHERE f_leak(dtitle);
-- viewpoint from regress_rls_carol
SET SESSION AUTHORIZATION regress_rls_carol;
SELECT * FROM part_document WHERE f_leak(dtitle) ORDER BY did;
+COPY part_document TO stdout WITH (DELIMITER ',');
EXPLAIN (COSTS OFF) SELECT * FROM part_document WHERE f_leak(dtitle);
-- viewpoint from regress_rls_dave
SET SESSION AUTHORIZATION regress_rls_dave;
SELECT * FROM part_document WHERE f_leak(dtitle) ORDER BY did;
+COPY part_document TO stdout WITH (DELIMITER ',');
EXPLAIN (COSTS OFF) SELECT * FROM part_document WHERE f_leak(dtitle);
-- pp1 ERROR
projects / postgresql.git / commitdiff