mirror of https://github.com/citusdata/citus.git
597 lines
15 KiB
C
597 lines
15 KiB
C
/*-------------------------------------------------------------------------
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*
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* fake_am.c
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* fake table access method code
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*
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* Copyright (c) Citus Data, Inc.
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*
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* IDENTIFICATION
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* Based on https://github.com/michaelpq/pg_plugins/blob/master/blackhole_am/blackhole_am.c
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*
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*
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* NOTES
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* This file introduces the table access method "fake", which delegates
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* bare minimum functionality for testing to heapam to provide an append
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* only access method, and doesn't implement rest of the functionality.
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/amapi.h"
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#include "access/heapam.h"
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#include "access/multixact.h"
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#include "access/tableam.h"
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#include "access/xact.h"
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#include "catalog/index.h"
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#include "catalog/storage.h"
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#include "catalog/storage_xlog.h"
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#include "commands/vacuum.h"
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#include "executor/tuptable.h"
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#include "storage/smgr.h"
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#include "utils/snapmgr.h"
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#include "pg_version_compat.h"
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#include "pg_version_constants.h"
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PG_FUNCTION_INFO_V1(fake_am_handler);
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static const TableAmRoutine fake_methods;
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/* ------------------------------------------------------------------------
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* Slot related callbacks for fake AM
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* ------------------------------------------------------------------------
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*/
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static const TupleTableSlotOps *
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fake_slot_callbacks(Relation relation)
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{
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return &TTSOpsBufferHeapTuple;
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}
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/* ------------------------------------------------------------------------
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* Table Scan Callbacks for fake AM
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* ------------------------------------------------------------------------
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*/
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static TableScanDesc
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fake_scan_begin(Relation relation, Snapshot snapshot,
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int nkeys, ScanKey key,
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ParallelTableScanDesc parallel_scan,
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uint32 flags)
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{
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return heap_beginscan(relation, snapshot, nkeys, key, parallel_scan, flags);
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}
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static void
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fake_scan_end(TableScanDesc sscan)
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{
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heap_endscan(sscan);
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}
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static void
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fake_scan_rescan(TableScanDesc sscan, ScanKey key, bool set_params,
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bool allow_strat, bool allow_sync, bool allow_pagemode)
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{
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heap_rescan(sscan, key, set_params, allow_strat, allow_sync, allow_pagemode);
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}
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static bool
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fake_scan_getnextslot(TableScanDesc sscan, ScanDirection direction,
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TupleTableSlot *slot)
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{
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ereport(WARNING, (errmsg("fake_scan_getnextslot")));
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return heap_getnextslot(sscan, direction, slot);
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}
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/* ------------------------------------------------------------------------
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* Index Scan Callbacks for fake AM
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* ------------------------------------------------------------------------
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*/
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static IndexFetchTableData *
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fake_index_fetch_begin(Relation rel)
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{
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elog(ERROR, "fake_index_fetch_begin not implemented");
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return NULL;
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}
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static void
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fake_index_fetch_reset(IndexFetchTableData *scan)
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{
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elog(ERROR, "fake_index_fetch_reset not implemented");
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}
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static void
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fake_index_fetch_end(IndexFetchTableData *scan)
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{
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elog(ERROR, "fake_index_fetch_end not implemented");
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}
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static bool
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fake_index_fetch_tuple(struct IndexFetchTableData *scan,
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ItemPointer tid,
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Snapshot snapshot,
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TupleTableSlot *slot,
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bool *call_again, bool *all_dead)
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{
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elog(ERROR, "fake_index_fetch_tuple not implemented");
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return false;
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}
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/* ------------------------------------------------------------------------
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* Callbacks for non-modifying operations on individual tuples for
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* fake AM.
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* ------------------------------------------------------------------------
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*/
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static bool
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fake_fetch_row_version(Relation relation,
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ItemPointer tid,
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Snapshot snapshot,
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TupleTableSlot *slot)
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{
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elog(ERROR, "fake_fetch_row_version not implemented");
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return false;
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}
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static void
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fake_get_latest_tid(TableScanDesc sscan,
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ItemPointer tid)
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{
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elog(ERROR, "fake_get_latest_tid not implemented");
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}
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static bool
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fake_tuple_tid_valid(TableScanDesc scan, ItemPointer tid)
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{
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elog(ERROR, "fake_tuple_tid_valid not implemented");
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return false;
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}
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static bool
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fake_tuple_satisfies_snapshot(Relation rel, TupleTableSlot *slot,
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Snapshot snapshot)
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{
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elog(ERROR, "fake_tuple_satisfies_snapshot not implemented");
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return false;
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}
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static TransactionId
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fake_index_delete_tuples(Relation rel,
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TM_IndexDeleteOp *delstate)
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{
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elog(ERROR, "fake_index_delete_tuples not implemented");
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return InvalidTransactionId;
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}
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/* ----------------------------------------------------------------------------
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* Functions for manipulations of physical tuples for fake AM.
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* ----------------------------------------------------------------------------
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*/
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static void
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fake_tuple_insert(Relation relation, TupleTableSlot *slot,
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CommandId cid, int options, BulkInsertState bistate)
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{
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ereport(WARNING, (errmsg("fake_tuple_insert")));
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/*
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* Code below this point is from heapam_tuple_insert from
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* heapam_handler.c
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*/
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bool shouldFree = true;
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HeapTuple tuple = ExecFetchSlotHeapTuple(slot, true, &shouldFree);
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/* Update the tuple with table oid */
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slot->tts_tableOid = RelationGetRelid(relation);
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tuple->t_tableOid = slot->tts_tableOid;
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/* Perform the insertion, and copy the resulting ItemPointer */
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heap_insert(relation, tuple, cid, options, bistate);
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ItemPointerCopy(&tuple->t_self, &slot->tts_tid);
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if (shouldFree)
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{
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pfree(tuple);
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}
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}
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static void
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fake_tuple_insert_speculative(Relation relation, TupleTableSlot *slot,
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CommandId cid, int options,
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BulkInsertState bistate,
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uint32 specToken)
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{
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elog(ERROR, "fake_tuple_insert_speculative not implemented");
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}
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static void
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fake_tuple_complete_speculative(Relation relation, TupleTableSlot *slot,
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uint32 spekToken, bool succeeded)
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{
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elog(ERROR, "fake_tuple_complete_speculative not implemented");
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}
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static void
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fake_multi_insert(Relation relation, TupleTableSlot **slots,
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int ntuples, CommandId cid, int options,
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BulkInsertState bistate)
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{
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ereport(WARNING, (errmsg("fake_multi_insert")));
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heap_multi_insert(relation, slots, ntuples, cid, options, bistate);
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}
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static TM_Result
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fake_tuple_delete(Relation relation, ItemPointer tid, CommandId cid,
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Snapshot snapshot, Snapshot crosscheck, bool wait,
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TM_FailureData *tmfd, bool changingPart)
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{
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elog(ERROR, "fake_tuple_delete not implemented");
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}
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static TM_Result
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fake_tuple_update(Relation relation, ItemPointer otid,
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TupleTableSlot *slot, CommandId cid,
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Snapshot snapshot, Snapshot crosscheck,
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bool wait, TM_FailureData *tmfd,
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LockTupleMode *lockmode, TU_UpdateIndexes *update_indexes)
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{
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elog(ERROR, "fake_tuple_update not implemented");
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}
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static TM_Result
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fake_tuple_lock(Relation relation, ItemPointer tid, Snapshot snapshot,
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TupleTableSlot *slot, CommandId cid, LockTupleMode mode,
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LockWaitPolicy wait_policy, uint8 flags,
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TM_FailureData *tmfd)
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{
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elog(ERROR, "fake_tuple_lock not implemented");
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}
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static void
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fake_finish_bulk_insert(Relation relation, int options)
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{
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/* nothing to do here */
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}
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/* ------------------------------------------------------------------------
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* DDL related callbacks for fake AM.
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* ------------------------------------------------------------------------
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*/
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static void
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fake_relation_set_new_filenode(Relation rel,
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const RelFileLocator *newrnode,
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char persistence,
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TransactionId *freezeXid,
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MultiXactId *minmulti)
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{
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/*
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* Code below is copied from heapam_relation_set_new_filenode in
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* heapam_handler.c.
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*/
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/*
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* Initialize to the minimum XID that could put tuples in the table. We
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* know that no xacts older than RecentXmin are still running, so that
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* will do.
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*/
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*freezeXid = RecentXmin;
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/*
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* Similarly, initialize the minimum Multixact to the first value that
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* could possibly be stored in tuples in the table. Running transactions
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* could reuse values from their local cache, so we are careful to
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* consider all currently running multis.
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*
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* XXX this could be refined further, but is it worth the hassle?
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*/
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*minmulti = GetOldestMultiXactId();
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SMgrRelation srel = RelationCreateStorage(*newrnode, persistence, true);
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/*
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* If required, set up an init fork for an unlogged table so that it can
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* be correctly reinitialized on restart. An immediate sync is required
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* even if the page has been logged, because the write did not go through
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* shared_buffers and therefore a concurrent checkpoint may have moved the
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* redo pointer past our xlog record. Recovery may as well remove it
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* while replaying, for example, XLOG_DBASE_CREATE or XLOG_TBLSPC_CREATE
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* record. Therefore, logging is necessary even if wal_level=minimal.
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*/
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if (persistence == RELPERSISTENCE_UNLOGGED)
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{
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Assert(rel->rd_rel->relkind == RELKIND_RELATION ||
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rel->rd_rel->relkind == RELKIND_MATVIEW ||
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rel->rd_rel->relkind == RELKIND_TOASTVALUE);
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smgrcreate(srel, INIT_FORKNUM, false);
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log_smgrcreate(newrnode, INIT_FORKNUM);
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smgrimmedsync(srel, INIT_FORKNUM);
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}
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smgrclose(srel);
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}
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static void
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fake_relation_nontransactional_truncate(Relation rel)
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{
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elog(ERROR, "fake_relation_nontransactional_truncate not implemented");
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}
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static void
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fake_copy_data(Relation rel, const RelFileLocator *newrnode)
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{
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elog(ERROR, "fake_copy_data not implemented");
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}
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static void
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fake_copy_for_cluster(Relation OldTable, Relation NewTable,
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Relation OldIndex, bool use_sort,
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TransactionId OldestXmin,
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TransactionId *xid_cutoff,
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MultiXactId *multi_cutoff,
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double *num_tuples,
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double *tups_vacuumed,
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double *tups_recently_dead)
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{
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elog(ERROR, "fake_copy_for_cluster not implemented");
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}
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static void
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fake_vacuum(Relation onerel, VacuumParams *params,
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BufferAccessStrategy bstrategy)
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{
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elog(WARNING, "fake_copy_for_cluster not implemented");
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}
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static bool
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fake_scan_analyze_next_block(TableScanDesc scan,
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#if PG_VERSION_NUM >= PG_VERSION_17
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ReadStream *stream)
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#else
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BlockNumber blockno,
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BufferAccessStrategy bstrategy)
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#endif
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{
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/* we don't support analyze, so return false */
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return false;
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}
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static bool
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fake_scan_analyze_next_tuple(TableScanDesc scan, TransactionId OldestXmin,
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double *liverows, double *deadrows,
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TupleTableSlot *slot)
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{
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elog(ERROR, "fake_scan_analyze_next_tuple not implemented");
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}
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static double
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fake_index_build_range_scan(Relation tableRelation,
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Relation indexRelation,
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IndexInfo *indexInfo,
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bool allow_sync,
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bool anyvisible,
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bool progress,
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BlockNumber start_blockno,
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BlockNumber numblocks,
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IndexBuildCallback callback,
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void *callback_state,
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TableScanDesc scan)
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{
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elog(ERROR, "fake_index_build_range_scan not implemented");
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}
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static void
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fake_index_validate_scan(Relation tableRelation,
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Relation indexRelation,
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IndexInfo *indexInfo,
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Snapshot snapshot,
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ValidateIndexState *state)
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{
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elog(ERROR, "fake_index_build_range_scan not implemented");
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}
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/* ------------------------------------------------------------------------
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* Miscellaneous callbacks for the fake AM
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* ------------------------------------------------------------------------
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*/
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static uint64
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fake_relation_size(Relation rel, ForkNumber forkNumber)
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{
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/*
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* Code below is copied from heapam_relation_size from
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* heapam_handler.c.
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*/
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uint64 nblocks = 0;
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/* InvalidForkNumber indicates returning the size for all forks */
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if (forkNumber == InvalidForkNumber)
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{
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for (int i = 0; i < MAX_FORKNUM; i++)
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{
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nblocks += smgrnblocks(RelationGetSmgr(rel), i);
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}
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}
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else
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{
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nblocks = smgrnblocks(RelationGetSmgr(rel), forkNumber);
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}
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return nblocks * BLCKSZ;
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}
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/*
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* Check to see whether the table needs a TOAST table.
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*/
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static bool
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fake_relation_needs_toast_table(Relation rel)
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{
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/* we don't test toastable data with this, so no toast table needed */
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return false;
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}
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/* ------------------------------------------------------------------------
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* Planner related callbacks for the fake AM
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* ------------------------------------------------------------------------
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*/
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static void
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fake_estimate_rel_size(Relation rel, int32 *attr_widths,
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BlockNumber *pages, double *tuples,
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double *allvisfrac)
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{
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/* no data available */
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*attr_widths = 0;
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*tuples = 0;
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*allvisfrac = 0;
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*pages = 0;
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}
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/* ------------------------------------------------------------------------
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* Executor related callbacks for the fake AM
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* ------------------------------------------------------------------------
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*/
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#if PG_VERSION_NUM < PG_VERSION_18
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static bool
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fake_scan_bitmap_next_block(TableScanDesc scan,
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TBMIterateResult *tbmres)
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{
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elog(ERROR, "fake_scan_bitmap_next_block not implemented");
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}
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static bool
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fake_scan_bitmap_next_tuple(TableScanDesc scan,
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TBMIterateResult *tbmres,
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TupleTableSlot *slot)
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{
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elog(ERROR, "fake_scan_bitmap_next_tuple not implemented");
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}
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#endif
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static bool
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fake_scan_sample_next_block(TableScanDesc scan,
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SampleScanState *scanstate)
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{
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elog(ERROR, "fake_scan_sample_next_block not implemented");
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}
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static bool
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fake_scan_sample_next_tuple(TableScanDesc scan,
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SampleScanState *scanstate,
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TupleTableSlot *slot)
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{
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elog(ERROR, "fake_scan_sample_next_tuple not implemented");
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}
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/* ------------------------------------------------------------------------
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* Definition of the fake table access method.
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* ------------------------------------------------------------------------
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*/
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static const TableAmRoutine fake_methods = {
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.type = T_TableAmRoutine,
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.slot_callbacks = fake_slot_callbacks,
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.scan_begin = fake_scan_begin,
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.scan_end = fake_scan_end,
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.scan_rescan = fake_scan_rescan,
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.scan_getnextslot = fake_scan_getnextslot,
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/* these are common helper functions */
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.parallelscan_estimate = table_block_parallelscan_estimate,
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.parallelscan_initialize = table_block_parallelscan_initialize,
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.parallelscan_reinitialize = table_block_parallelscan_reinitialize,
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.index_fetch_begin = fake_index_fetch_begin,
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.index_fetch_reset = fake_index_fetch_reset,
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.index_fetch_end = fake_index_fetch_end,
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.index_fetch_tuple = fake_index_fetch_tuple,
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.tuple_insert = fake_tuple_insert,
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.tuple_insert_speculative = fake_tuple_insert_speculative,
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.tuple_complete_speculative = fake_tuple_complete_speculative,
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.multi_insert = fake_multi_insert,
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.tuple_delete = fake_tuple_delete,
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.tuple_update = fake_tuple_update,
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.tuple_lock = fake_tuple_lock,
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.finish_bulk_insert = fake_finish_bulk_insert,
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.tuple_fetch_row_version = fake_fetch_row_version,
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.tuple_get_latest_tid = fake_get_latest_tid,
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.tuple_tid_valid = fake_tuple_tid_valid,
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.tuple_satisfies_snapshot = fake_tuple_satisfies_snapshot,
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.index_delete_tuples = fake_index_delete_tuples,
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.relation_set_new_filelocator = fake_relation_set_new_filenode,
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.relation_nontransactional_truncate = fake_relation_nontransactional_truncate,
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.relation_copy_data = fake_copy_data,
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.relation_copy_for_cluster = fake_copy_for_cluster,
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.relation_vacuum = fake_vacuum,
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.scan_analyze_next_block = fake_scan_analyze_next_block,
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.scan_analyze_next_tuple = fake_scan_analyze_next_tuple,
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.index_build_range_scan = fake_index_build_range_scan,
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.index_validate_scan = fake_index_validate_scan,
|
||
|
||
.relation_size = fake_relation_size,
|
||
.relation_needs_toast_table = fake_relation_needs_toast_table,
|
||
|
||
.relation_estimate_size = fake_estimate_rel_size,
|
||
|
||
#if PG_VERSION_NUM < PG_VERSION_18
|
||
|
||
/* these two fields were removed in PG 18 */
|
||
.scan_bitmap_next_block = fake_scan_bitmap_next_block,
|
||
.scan_bitmap_next_tuple = fake_scan_bitmap_next_tuple,
|
||
#endif
|
||
|
||
.scan_sample_next_block = fake_scan_sample_next_block,
|
||
.scan_sample_next_tuple = fake_scan_sample_next_tuple
|
||
};
|
||
|
||
|
||
Datum
|
||
fake_am_handler(PG_FUNCTION_ARGS)
|
||
{
|
||
PG_RETURN_POINTER(&fake_methods);
|
||
}
|