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Diffstat (limited to 'contrib/pageinspect/btreefuncs.c')
-rw-r--r--contrib/pageinspect/btreefuncs.c146
1 files changed, 128 insertions, 18 deletions
diff --git a/contrib/pageinspect/btreefuncs.c b/contrib/pageinspect/btreefuncs.c
index 564c818558f..2ddedef7141 100644
--- a/contrib/pageinspect/btreefuncs.c
+++ b/contrib/pageinspect/btreefuncs.c
@@ -31,9 +31,11 @@
#include "access/relation.h"
#include "catalog/namespace.h"
#include "catalog/pg_am.h"
+#include "catalog/pg_type.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "pageinspect.h"
+#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/rel.h"
#include "utils/varlena.h"
@@ -45,6 +47,8 @@ PG_FUNCTION_INFO_V1(bt_page_stats);
#define IS_INDEX(r) ((r)->rd_rel->relkind == RELKIND_INDEX)
#define IS_BTREE(r) ((r)->rd_rel->relam == BTREE_AM_OID)
+#define DatumGetItemPointer(X) ((ItemPointer) DatumGetPointer(X))
+#define ItemPointerGetDatum(X) PointerGetDatum(X)
/* note: BlockNumber is unsigned, hence can't be negative */
#define CHECK_RELATION_BLOCK_RANGE(rel, blkno) { \
@@ -243,6 +247,9 @@ struct user_args
{
Page page;
OffsetNumber offset;
+ bool leafpage;
+ bool rightmost;
+ TupleDesc tupd;
};
/*-------------------------------------------------------
@@ -252,17 +259,25 @@ struct user_args
* ------------------------------------------------------
*/
static Datum
-bt_page_print_tuples(FuncCallContext *fctx, Page page, OffsetNumber offset)
+bt_page_print_tuples(FuncCallContext *fctx, struct user_args *uargs)
{
- char *values[6];
+ Page page = uargs->page;
+ OffsetNumber offset = uargs->offset;
+ bool leafpage = uargs->leafpage;
+ bool rightmost = uargs->rightmost;
+ bool ispivottuple;
+ Datum values[9];
+ bool nulls[9];
HeapTuple tuple;
ItemId id;
IndexTuple itup;
int j;
int off;
int dlen;
- char *dump;
+ char *dump,
+ *datacstring;
char *ptr;
+ ItemPointer htid;
id = PageGetItemId(page, offset);
@@ -272,18 +287,49 @@ bt_page_print_tuples(FuncCallContext *fctx, Page page, OffsetNumber offset)
itup = (IndexTuple) PageGetItem(page, id);
j = 0;
- values[j++] = psprintf("%d", offset);
- values[j++] = psprintf("(%u,%u)",
- ItemPointerGetBlockNumberNoCheck(&itup->t_tid),
- ItemPointerGetOffsetNumberNoCheck(&itup->t_tid));
- values[j++] = psprintf("%d", (int) IndexTupleSize(itup));
- values[j++] = psprintf("%c", IndexTupleHasNulls(itup) ? 't' : 'f');
- values[j++] = psprintf("%c", IndexTupleHasVarwidths(itup) ? 't' : 'f');
+ memset(nulls, 0, sizeof(nulls));
+ values[j++] = DatumGetInt16(offset);
+ values[j++] = ItemPointerGetDatum(&itup->t_tid);
+ values[j++] = Int32GetDatum((int) IndexTupleSize(itup));
+ values[j++] = BoolGetDatum(IndexTupleHasNulls(itup));
+ values[j++] = BoolGetDatum(IndexTupleHasVarwidths(itup));
ptr = (char *) itup + IndexInfoFindDataOffset(itup->t_info);
dlen = IndexTupleSize(itup) - IndexInfoFindDataOffset(itup->t_info);
+
+ /*
+ * Make sure that "data" column does not include posting list or pivot
+ * tuple representation of heap TID(s).
+ *
+ * Note: BTreeTupleIsPivot() won't work reliably on !heapkeyspace indexes
+ * (those built before BTREE_VERSION 4), but we have no way of determining
+ * if this page came from a !heapkeyspace index. We may only have a bytea
+ * nbtree page image to go on, so in general there is no metapage that we
+ * can check.
+ *
+ * That's okay here because BTreeTupleIsPivot() can only return false for
+ * a !heapkeyspace pivot, never true for a !heapkeyspace non-pivot. Since
+ * heap TID isn't part of the keyspace in a !heapkeyspace index anyway,
+ * there cannot possibly be a pivot tuple heap TID representation that we
+ * fail to make an adjustment for. A !heapkeyspace index can have
+ * BTreeTupleIsPivot() return true (due to things like suffix truncation
+ * for INCLUDE indexes in Postgres v11), but when that happens
+ * BTreeTupleGetHeapTID() can be trusted to work reliably (i.e. return
+ * NULL).
+ *
+ * Note: BTreeTupleIsPosting() always works reliably, even with
+ * !heapkeyspace indexes.
+ */
+ if (BTreeTupleIsPosting(itup))
+ dlen -= IndexTupleSize(itup) - BTreeTupleGetPostingOffset(itup);
+ else if (BTreeTupleIsPivot(itup) && BTreeTupleGetHeapTID(itup) != NULL)
+ dlen -= MAXALIGN(sizeof(ItemPointerData));
+
+ if (dlen < 0 || dlen > INDEX_SIZE_MASK)
+ elog(ERROR, "invalid tuple length %d for tuple at offset number %u",
+ dlen, offset);
dump = palloc0(dlen * 3 + 1);
- values[j] = dump;
+ datacstring = dump;
for (off = 0; off < dlen; off++)
{
if (off > 0)
@@ -291,8 +337,62 @@ bt_page_print_tuples(FuncCallContext *fctx, Page page, OffsetNumber offset)
sprintf(dump, "%02x", *(ptr + off) & 0xff);
dump += 2;
}
+ values[j++] = CStringGetTextDatum(datacstring);
+ pfree(datacstring);
+
+ /*
+ * We need to work around the BTreeTupleIsPivot() !heapkeyspace limitation
+ * again. Deduce whether or not tuple must be a pivot tuple based on
+ * whether or not the page is a leaf page, as well as the page offset
+ * number of the tuple.
+ */
+ ispivottuple = (!leafpage || (!rightmost && offset == P_HIKEY));
+
+ /* LP_DEAD bit can never be set for pivot tuples, so show a NULL there */
+ if (!ispivottuple)
+ values[j++] = BoolGetDatum(ItemIdIsDead(id));
+ else
+ {
+ Assert(!ItemIdIsDead(id));
+ nulls[j++] = true;
+ }
+
+ htid = BTreeTupleGetHeapTID(itup);
+ if (ispivottuple && !BTreeTupleIsPivot(itup))
+ {
+ /* Don't show bogus heap TID in !heapkeyspace pivot tuple */
+ htid = NULL;
+ }
+
+ if (htid)
+ values[j++] = ItemPointerGetDatum(htid);
+ else
+ nulls[j++] = true;
+
+ if (BTreeTupleIsPosting(itup))
+ {
+ /* Build an array of item pointers */
+ ItemPointer tids;
+ Datum *tids_datum;
+ int nposting;
+
+ tids = BTreeTupleGetPosting(itup);
+ nposting = BTreeTupleGetNPosting(itup);
+ tids_datum = (Datum *) palloc(nposting * sizeof(Datum));
+ for (int i = 0; i < nposting; i++)
+ tids_datum[i] = ItemPointerGetDatum(&tids[i]);
+ values[j++] = PointerGetDatum(construct_array(tids_datum,
+ nposting,
+ TIDOID,
+ sizeof(ItemPointerData),
+ false, 's'));
+ pfree(tids_datum);
+ }
+ else
+ nulls[j++] = true;
- tuple = BuildTupleFromCStrings(fctx->attinmeta, values);
+ /* Build and return the result tuple */
+ tuple = heap_form_tuple(uargs->tupd, values, nulls);
return HeapTupleGetDatum(tuple);
}
@@ -378,12 +478,15 @@ bt_page_items(PG_FUNCTION_ARGS)
elog(NOTICE, "page is deleted");
fctx->max_calls = PageGetMaxOffsetNumber(uargs->page);
+ uargs->leafpage = P_ISLEAF(opaque);
+ uargs->rightmost = P_RIGHTMOST(opaque);
/* Build a tuple descriptor for our result type */
if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
elog(ERROR, "return type must be a row type");
+ tupleDesc = BlessTupleDesc(tupleDesc);
- fctx->attinmeta = TupleDescGetAttInMetadata(tupleDesc);
+ uargs->tupd = tupleDesc;
fctx->user_fctx = uargs;
@@ -395,7 +498,7 @@ bt_page_items(PG_FUNCTION_ARGS)
if (fctx->call_cntr < fctx->max_calls)
{
- result = bt_page_print_tuples(fctx, uargs->page, uargs->offset);
+ result = bt_page_print_tuples(fctx, uargs);
uargs->offset++;
SRF_RETURN_NEXT(fctx, result);
}
@@ -463,12 +566,15 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
elog(NOTICE, "page is deleted");
fctx->max_calls = PageGetMaxOffsetNumber(uargs->page);
+ uargs->leafpage = P_ISLEAF(opaque);
+ uargs->rightmost = P_RIGHTMOST(opaque);
/* Build a tuple descriptor for our result type */
if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
elog(ERROR, "return type must be a row type");
+ tupleDesc = BlessTupleDesc(tupleDesc);
- fctx->attinmeta = TupleDescGetAttInMetadata(tupleDesc);
+ uargs->tupd = tupleDesc;
fctx->user_fctx = uargs;
@@ -480,7 +586,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
if (fctx->call_cntr < fctx->max_calls)
{
- result = bt_page_print_tuples(fctx, uargs->page, uargs->offset);
+ result = bt_page_print_tuples(fctx, uargs);
uargs->offset++;
SRF_RETURN_NEXT(fctx, result);
}
@@ -510,7 +616,7 @@ bt_metap(PG_FUNCTION_ARGS)
BTMetaPageData *metad;
TupleDesc tupleDesc;
int j;
- char *values[8];
+ char *values[9];
Buffer buffer;
Page page;
HeapTuple tuple;
@@ -557,17 +663,21 @@ bt_metap(PG_FUNCTION_ARGS)
/*
* Get values of extended metadata if available, use default values
- * otherwise.
+ * otherwise. Note that we rely on the assumption that btm_allequalimage
+ * is initialized to zero with indexes that were built on versions prior
+ * to Postgres 13 (just like _bt_metaversion()).
*/
if (metad->btm_version >= BTREE_NOVAC_VERSION)
{
values[j++] = psprintf("%u", metad->btm_oldest_btpo_xact);
values[j++] = psprintf("%f", metad->btm_last_cleanup_num_heap_tuples);
+ values[j++] = metad->btm_allequalimage ? "t" : "f";
}
else
{
values[j++] = "0";
values[j++] = "-1";
+ values[j++] = "f";
}
tuple = BuildTupleFromCStrings(TupleDescGetAttInMetadata(tupleDesc),
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-30 17:45:04 +0000