mirror of https://github.com/citusdata/citus.git
66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
#ifndef COLUMNAR_TABLEAM_H
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#define COLUMNAR_TABLEAM_H
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#include "citus_version.h"
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#include "postgres.h"
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#include "fmgr.h"
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#include "access/tableam.h"
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#include "access/skey.h"
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#include "nodes/bitmapset.h"
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#include "access/heapam.h"
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#include "catalog/indexing.h"
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#include "utils/acl.h"
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/*
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* Number of valid ItemPointer Offset's for "row number" <> "ItemPointer"
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* mapping.
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*
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* Postgres has some asserts calling either ItemPointerIsValid or
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* OffsetNumberIsValid. That constraints itemPointer.offsetNumber
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* for columnar tables to the following interval:
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* [FirstOffsetNumber, MaxOffsetNumber].
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*
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* However, bitmap scan logic assumes that itemPointer.offsetNumber cannot
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* be larger than MaxHeapTuplesPerPage (see tbm_add_tuples).
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*
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* For this reason, we restrict itemPointer.offsetNumber
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* to the following interval: [FirstOffsetNumber, MaxHeapTuplesPerPage].
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*/
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#define VALID_ITEMPOINTER_OFFSETS \
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((uint64) (MaxHeapTuplesPerPage - FirstOffsetNumber + 1))
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/*
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* Number of valid ItemPointer BlockNumber's for "row number" <> "ItemPointer"
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* mapping.
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*
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* Similar to VALID_ITEMPOINTER_OFFSETS, due to asserts around
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* itemPointer.blockNumber, we can only use values upto and including
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* MaxBlockNumber.
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* Note that postgres doesn't restrict blockNumber to a lower boundary.
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*
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* For this reason, we restrict itemPointer.blockNumber
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* to the following interval: [0, MaxBlockNumber].
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*/
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#define VALID_BLOCKNUMBERS ((uint64) (MaxBlockNumber + 1))
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struct ColumnarScanDescData;
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typedef struct ColumnarScanDescData *ColumnarScanDesc;
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const TableAmRoutine * GetColumnarTableAmRoutine(void);
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extern void columnar_tableam_init(void);
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extern TableScanDesc columnar_beginscan_extended(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, Bitmapset *attr_needed,
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List *scanQual);
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extern int64 ColumnarScanChunkGroupsFiltered(ColumnarScanDesc columnarScanDesc);
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extern bool ColumnarSupportsIndexAM(char *indexAMName);
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extern bool IsColumnarTableAmTable(Oid relationId);
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extern DefElem * GetExtensionOption(List *extensionOptions,
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const char *defname);
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#endif /* COLUMNAR_TABLEAM_H */
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