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Update obsolete nbtree array preprocessing comments.

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The array->scan_key references fixed up at the end of preprocessing
start out as offsets into the arrayKeyData[] array (the array returned
by _bt_preprocess_array_keys at the start of preprocessing that involves
array scan keys).  Offsets into the arrayKeyData[] array are no longer
guaranteed to be valid offsets into our original scan->keyData[] input
scan key array, but comments describing the array->scan_key references
still talked about scan->keyData[].  Update those comments.

Oversight in commit b5249741.
This commit is contained in:
Peter Geoghegan 2024-09-24 12:58:55 -04:00
parent 62ddf7ee9a
commit 3da436ec09
1 changed files with 4 additions and 5 deletions
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9
src/backend/access/nbtree/nbtutils.c
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@ -538,11 +538,10 @@ _bt_preprocess_array_keys(IndexScanDesc scan, int *new_numberOfKeys)
* _bt_preprocess_array_keys_final() -- fix up array scan key references * _bt_preprocess_array_keys_final() -- fix up array scan key references
* *
* When _bt_preprocess_array_keys performed initial array preprocessing, it * When _bt_preprocess_array_keys performed initial array preprocessing, it
* set each array's array->scan_key to the array's arrayKeys[] entry offset * set each array's array->scan_key to its scankey's arrayKeyData[] offset.
* (that also work as references into the original scan->keyData[] array).
* This function handles translation of the scan key references from the * This function handles translation of the scan key references from the
* BTArrayKeyInfo info array, from input scan key references (to the keys in * BTArrayKeyInfo info array, from input scan key references (to the keys in
* scan->keyData[]), into output references (to the keys in so->keyData[]). * arrayKeyData[]), into output references (to the keys in so->keyData[]).
* Caller's keyDataMap[] array tells us how to perform this remapping. * Caller's keyDataMap[] array tells us how to perform this remapping.
* *
* Also finalizes so->orderProcs[] for the scan. Arrays already have an ORDER * Also finalizes so->orderProcs[] for the scan. Arrays already have an ORDER
@ -2974,8 +2973,8 @@ _bt_preprocess_keys(IndexScanDesc scan)
/* /*
* Now that we've built a temporary mapping from so->keyData[] (output * Now that we've built a temporary mapping from so->keyData[] (output
* scan keys) to scan->keyData[] (input scan keys), fix array->scan_key * scan keys) to arrayKeyData[] (our input scan keys), fix array->scan_key
* references. Also consolidate the so->orderProc[] array such that it * references. Also consolidate the so->orderProcs[] array such that it
* can be subscripted using so->keyData[]-wise offsets. * can be subscripted using so->keyData[]-wise offsets.
*/ */
if (arrayKeyData) if (arrayKeyData)