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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:17:33 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:17:33 +0000
commit5e45211a64149b3c659b90ff2de6fa982a5a93ed (patch)
tree739caf8c461053357daa9f162bef34516c7bf452 /src/backend/access/table/tableamapi.c
parentInitial commit. (diff)
downloadpostgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.tar.xz
postgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.zip
Adding upstream version 15.5.upstream/15.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/backend/access/table/tableamapi.c')
-rw-r--r--src/backend/access/table/tableamapi.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/src/backend/access/table/tableamapi.c b/src/backend/access/table/tableamapi.c
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+/*----------------------------------------------------------------------
+ *
+ * tableamapi.c
+ * Support routines for API for Postgres table access methods
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/backend/access/table/tableamapi.c
+ *----------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "access/heapam.h"
+#include "access/htup_details.h"
+#include "access/tableam.h"
+#include "access/xact.h"
+#include "catalog/pg_am.h"
+#include "catalog/pg_proc.h"
+#include "commands/defrem.h"
+#include "miscadmin.h"
+#include "utils/fmgroids.h"
+#include "utils/memutils.h"
+#include "utils/syscache.h"
+
+
+/*
+ * GetTableAmRoutine
+ * Call the specified access method handler routine to get its
+ * TableAmRoutine struct, which will be palloc'd in the caller's
+ * memory context.
+ */
+const TableAmRoutine *
+GetTableAmRoutine(Oid amhandler)
+{
+ Datum datum;
+ const TableAmRoutine *routine;
+
+ datum = OidFunctionCall0(amhandler);
+ routine = (TableAmRoutine *) DatumGetPointer(datum);
+
+ if (routine == NULL || !IsA(routine, TableAmRoutine))
+ elog(ERROR, "table access method handler %u did not return a TableAmRoutine struct",
+ amhandler);
+
+ /*
+ * Assert that all required callbacks are present. That makes it a bit
+ * easier to keep AMs up to date, e.g. when forward porting them to a new
+ * major version.
+ */
+ Assert(routine->scan_begin != NULL);
+ Assert(routine->scan_end != NULL);
+ Assert(routine->scan_rescan != NULL);
+ Assert(routine->scan_getnextslot != NULL);
+
+ Assert(routine->parallelscan_estimate != NULL);
+ Assert(routine->parallelscan_initialize != NULL);
+ Assert(routine->parallelscan_reinitialize != NULL);
+
+ Assert(routine->index_fetch_begin != NULL);
+ Assert(routine->index_fetch_reset != NULL);
+ Assert(routine->index_fetch_end != NULL);
+ Assert(routine->index_fetch_tuple != NULL);
+
+ Assert(routine->tuple_fetch_row_version != NULL);
+ Assert(routine->tuple_tid_valid != NULL);
+ Assert(routine->tuple_get_latest_tid != NULL);
+ Assert(routine->tuple_satisfies_snapshot != NULL);
+ Assert(routine->index_delete_tuples != NULL);
+
+ Assert(routine->tuple_insert != NULL);
+
+ /*
+ * Could be made optional, but would require throwing error during
+ * parse-analysis.
+ */
+ Assert(routine->tuple_insert_speculative != NULL);
+ Assert(routine->tuple_complete_speculative != NULL);
+
+ Assert(routine->multi_insert != NULL);
+ Assert(routine->tuple_delete != NULL);
+ Assert(routine->tuple_update != NULL);
+ Assert(routine->tuple_lock != NULL);
+
+ Assert(routine->relation_set_new_filenode != NULL);
+ Assert(routine->relation_nontransactional_truncate != NULL);
+ Assert(routine->relation_copy_data != NULL);
+ Assert(routine->relation_copy_for_cluster != NULL);
+ Assert(routine->relation_vacuum != NULL);
+ Assert(routine->scan_analyze_next_block != NULL);
+ Assert(routine->scan_analyze_next_tuple != NULL);
+ Assert(routine->index_build_range_scan != NULL);
+ Assert(routine->index_validate_scan != NULL);
+
+ Assert(routine->relation_size != NULL);
+ Assert(routine->relation_needs_toast_table != NULL);
+
+ Assert(routine->relation_estimate_size != NULL);
+
+ /* optional, but one callback implies presence of the other */
+ Assert((routine->scan_bitmap_next_block == NULL) ==
+ (routine->scan_bitmap_next_tuple == NULL));
+ Assert(routine->scan_sample_next_block != NULL);
+ Assert(routine->scan_sample_next_tuple != NULL);
+
+ return routine;
+}
+
+/* check_hook: validate new default_table_access_method */
+bool
+check_default_table_access_method(char **newval, void **extra, GucSource source)
+{
+ if (**newval == '\0')
+ {
+ GUC_check_errdetail("%s cannot be empty.",
+ "default_table_access_method");
+ return false;
+ }
+
+ if (strlen(*newval) >= NAMEDATALEN)
+ {
+ GUC_check_errdetail("%s is too long (maximum %d characters).",
+ "default_table_access_method", NAMEDATALEN - 1);
+ return false;
+ }
+
+ /*
+ * If we aren't inside a transaction, or not connected to a database, we
+ * cannot do the catalog access necessary to verify the method. Must
+ * accept the value on faith.
+ */
+ if (IsTransactionState() && MyDatabaseId != InvalidOid)
+ {
+ if (!OidIsValid(get_table_am_oid(*newval, true)))
+ {
+ /*
+ * When source == PGC_S_TEST, don't throw a hard error for a
+ * nonexistent table access method, only a NOTICE. See comments in
+ * guc.h.
+ */
+ if (source == PGC_S_TEST)
+ {
+ ereport(NOTICE,
+ (errcode(ERRCODE_UNDEFINED_OBJECT),
+ errmsg("table access method \"%s\" does not exist",
+ *newval)));
+ }
+ else
+ {
+ GUC_check_errdetail("Table access method \"%s\" does not exist.",
+ *newval);
+ return false;
+ }
+ }
+ }
+
+ return true;
+}