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1 parent 6b94e7a commit e9b873fCopy full SHA for e9b873f
src/backend/access/heap/vacuumlazy.c
@@ -1898,7 +1898,13 @@ lazy_scan_prune(LVRelState *vacrel,
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}
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/*
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- * Remove the collected garbage tuples from the table and its indexes.
+ * Main entry point for index vacuuming and heap vacuuming.
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+ *
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+ * Removes items collected in dead_items from table's indexes, then marks the
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+ * same items LP_UNUSED in the heap. See the comments above lazy_scan_heap
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+ * for full details.
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+ * Also empties dead_items, freeing up space for later TIDs.
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*
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* We may choose to bypass index vacuuming at this point, though only when the
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* ongoing VACUUM operation will definitely only have one index scan/round of
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