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Improve comments for TidRangeEval

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Here we provide a bit more detail on why TidRangeEval() does return false
when trss_mintid is greater than trss_maxtid.

Reported-by: Junwang Zhao <zhjwpku@gmail.com>
Author: David Rowley <dgrowleyml@gmail.com>
Reviewed-by: Junwang Zhao <zhjwpku@gmail.com>
Discussion: https://postgr.es/m/CAEG8a3KUbUUqQgfK5X8Sj-%2BppPtGNTU%2BZiep0Rxr7SLjoR%2BB6w%40mail.gmail.com
This commit is contained in:
David Rowley
2025-06-14 17:18:31 +12:00
parent 0fe50417ec
commit 2f98f967fa
1 changed files with 4 additions and 2 deletions
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6
src/backend/executor/nodeTidrangescan.c
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@ -128,9 +128,11 @@ TidExprListCreate(TidRangeScanState *tidrangestate)
* TidRangeEval * TidRangeEval
* *
* Compute and set node's block and offset range to scan by evaluating * Compute and set node's block and offset range to scan by evaluating
* the trss_tidexprs. Returns false if we detect the range cannot * node->trss_tidexprs. Returns false if we detect the range cannot
* contain any tuples. Returns true if it's possible for the range to * contain any tuples. Returns true if it's possible for the range to
* contain tuples. * contain tuples. We don't bother validating that trss_mintid is less
* than or equal to trss_maxtid, as the scan_set_tidrange() table AM
* function will handle that.
* ---------------------------------------------------------------- * ----------------------------------------------------------------
*/ */
static bool static bool