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PostgreSQL: implement pgproee 14
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Pavel Safonov committed Aug 2, 2022
1 parent 6ed0263 commit ffd7c9b
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Showing 4 changed files with 604 additions and 378 deletions.
133 changes: 133 additions & 0 deletions format/postgres/flavours/pgproee14/pgheap.go
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package pgproee14

import (
"github.com/wader/fq/format/postgres/common"
"github.com/wader/fq/format/postgres/flavours/postgres14/common14"
"github.com/wader/fq/pkg/decode"
)

// type = struct PageHeaderData {
/* 0 | 8 */ // PageXLogRecPtr pd_lsn;
/* 8 | 2 */ // uint16 pd_checksum;
/* 10 | 2 */ // uint16 pd_flags;
/* 12 | 2 */ // LocationIndex pd_lower;
/* 14 | 2 */ // LocationIndex pd_upper;
/* 16 | 2 */ // LocationIndex pd_special;
/* 18 | 2 */ // uint16 pd_pagesize_version;
/* 20 | 0 */ // ItemIdData pd_linp[];
//
/* total size (bytes): 20 */

// type = struct {
/* 0 | 4 */ // uint32 xlogid;
/* 4 | 4 */ // uint32 xrecoff;
//
/* total size (bytes): 8 */

// type = struct ItemIdData {
/* 0: 0 | 4 */ // unsigned int lp_off : 15;
/* 1: 7 | 4 */ // unsigned int lp_flags : 2;
/* 2: 1 | 4 */ // unsigned int lp_len : 15;
//
/* total size (bytes): 4 */

// type = struct HeapTupleHeaderData {
/* 0 | 12 */ // union {
/* 12 */ // HeapTupleFields t_heap;
/* 12 */ // DatumTupleFields t_datum;
// } t_choice;
/* total size (bytes): 12 */
//
/* 12 | 6 */ // ItemPointerData t_ctid
/* 18 | 2 */ // uint16 t_infomask2
/* 20 | 2 */ // uint16 t_infomask
/* 22 | 1 */ // uint8 t_hoff
/* 23 | 0 */ // bits8 t_bits[]
/* XXX 1-byte padding */
//
/* total size (bytes): 24 */

// type = struct HeapTupleFields {
/* 0 | 4 */ // ShortTransactionId t_xmin;
/* 4 | 4 */ // ShortTransactionId t_xmax;
/* 8 | 4 */ // union {
/* 4 */ // CommandId t_cid;
/* 4 */ // ShortTransactionId t_xvac;
//
/* total size (bytes): 4 */
// } t_field3;
//
/* total size (bytes): 12 */

// type = struct DatumTupleFields {
/* 0 | 4 */ // int32 datum_len_;
/* 4 | 4 */ // int32 datum_typmod;
/* 8 | 4 */ // Oid datum_typeid;
//
/* total size (bytes): 12 */

// type = struct ItemPointerData {
/* 0 | 4 */ // BlockIdData ip_blkid;
/* 4 | 2 */ // OffsetNumber ip_posid;
//
/* total size (bytes): 6 */

func DecodeHeap(d *decode.D) any {
heap := &common14.HeapD{
PageSize: common.HeapPageSize,
DecodePageHeaderDataFn: DecodePageHeaderData,
DecodePageSpecialFn: DecodePageSpecial,
}
return common14.DecodeHeap(d, heap)
}

// type = struct PageHeaderData {
/* 0 | 8 */ // PageXLogRecPtr pd_lsn;
/* 8 | 2 */ // uint16 pd_checksum;
/* 10 | 2 */ // uint16 pd_flags;
/* 12 | 2 */ // LocationIndex pd_lower;
/* 14 | 2 */ // LocationIndex pd_upper;
/* 16 | 2 */ // LocationIndex pd_special;
/* 18 | 2 */ // uint16 pd_pagesize_version;
/* 20 | 0 */ // ItemIdData pd_linp[];
func DecodePageHeaderData(d *decode.D) {
heap := common14.GetHeapD(d)
page := heap.Page

d.FieldStruct("pd_lsn", func(d *decode.D) {
/* 0 | 4 */ // uint32 xlogid;
/* 4 | 4 */ // uint32 xrecoff;
d.FieldU32("xlogid", common.HexMapper)
d.FieldU32("xrecoff", common.HexMapper)
})
d.FieldU16("pd_checksum")
d.FieldU16("pd_flags")
page.PdLower = uint16(d.FieldU16("pd_lower"))
page.PdUpper = uint16(d.FieldU16("pd_upper"))
page.PdSpecial = uint16(d.FieldU16("pd_special"))
page.PdPagesizeVersion = uint16(d.FieldU16("pd_pagesize_version"))

// ItemIdData pd_linp[];
page.ItemsEnd = int64(page.PagePosBegin*8) + int64(page.PdLower*8)
d.FieldArray("pd_linp", common14.DecodeItemIds)
}

// type = struct HeapPageSpecialData {
/* 0 | 8 */ // TransactionId pd_xid_base;
/* 8 | 8 */ // TransactionId pd_multi_base;
/* 16 | 4 */ // ShortTransactionId pd_prune_xid;
/* 20 | 4 */ // uint32 pd_magic;
//
/* total size (bytes): 24 */
func DecodePageSpecial(d *decode.D) {
heap := common14.GetHeapD(d)
page := heap.Page

specialPos := int64(page.PagePosBegin*8) + int64(page.PdSpecial*8)
d.SeekAbs(specialPos)

page.PdXidBase = d.FieldU64("pd_xid_base")
page.PdMultiBase = d.FieldU64("pd_multi_base")
page.PdPruneXid = d.FieldU32("pd_prune_xid")
page.PdMagic = d.FieldU32("pd_magic")
}
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