Function updatesetbit_inpage

src/backend/access/bitmap/bitmapinsert.c:623–1002

* updatesetbit_inpage() -- update the given bit to 1 in a given * bitmap page. * * The argument 'firstTidNumber' indicates the first tid location of * the bits stored in this page. This is necessary for locating the bit * of 'tidnum'. * * This update may generate new words that cause this page to overflow. * In this case, we will first check the next bitmap page have enough * space for th

 * a new bitmap page is created.
 */
static void
updatesetbit_inpage(Relation rel, uint64 tidnum,
					Buffer lovBuffer, OffsetNumber lovOffset,
					Buffer bitmapBuffer, uint64 firstTidNumber,
					bool use_wal)
{
	Page 			bitmapPage;
	BMBitmapOpaque	bitmapOpaque;
	BMBitmap		bitmap;
	Buffer			nextBuffer;
	Page			nextPage;
	BMBitmapOpaque	nextOpaque;
	BMBitmap		nextBitmap;

	uint64			bitNo = 0;
	uint32			wordNo;
	uint32          free_words;
	BM_HRL_WORD		word = 0;
	bool			found = false;

	BMTIDBuffer     words;
	BMTIDBuffer     new_words;
	BMTIDBuffer     words_left;

	bool			new_page;
	bool			new_lastpage;
	int             word_no;

	bitmapPage = BufferGetPage(bitmapBuffer);
	bitmapOpaque = (BMBitmapOpaque)PageGetSpecialPointer(bitmapPage);

	bitmap = (BMBitmap) PageGetContentsMaxAligned(bitmapPage);
	bitNo = 0;

	if (Debug_bitmap_print_insert)
		elog(LOG, "Bitmap Insert: updating a set bit in bitmap block %d, "
			 "lovBlock=%d, lovOffset=%d"
			 ", firstTidNumber=" INT64_FORMAT
			 ", bm_last_tid_location=" INT64_FORMAT
			 ", tidnum=" INT64_FORMAT
			 ", idxrelid=%u",
			 BufferGetBlockNumber(bitmapBuffer),
			 BufferGetBlockNumber(lovBuffer),
			 lovOffset,
			 firstTidNumber,
			 bitmapOpaque->bm_last_tid_location,
			 tidnum,
			 RelationGetRelid(rel));
	
	/* Find the word that contains the bit of tidnum. */
	for (wordNo = 0; wordNo < bitmapOpaque->bm_hrl_words_used; wordNo++)
	{
		word = bitmap->cwords[wordNo];
		if (IS_FILL_WORD(bitmap->hwords, wordNo))
			bitNo += FILL_LENGTH(word) * BM_HRL_WORD_SIZE;
		else
			bitNo += BM_HRL_WORD_SIZE;