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Improve comment for att_isnull.

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The comment implies that a 1 in the null bitmap indicates a null value,
but actually a 0 in the null bitmap indicates a null value. Try to
be more clear.

Patch by me; proposed wording reviewed by Alvaro Herrera and Tom Lane.

Discussion: http://postgr.es/m/CA+TgmobHOP8r6cG+UnsDFMrS30-m=jRrCBhgw-nFkn0k9QnFsg@mail.gmail.com
This commit is contained in:
Robert Haas 2019-05-13 13:13:24 -04:00
parent ddf927fb13
commit 221b377f09
1 changed files with 3 additions and 1 deletions
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4
src/include/access/tupmacs.h
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@ -16,7 +16,9 @@
/* /*
* check to see if the ATT'th bit of an array of 8-bit bytes is set. * Check a tuple's null bitmap to determine whether the attribute is null.
* Note that a 0 in the null bitmap indicates a null, while 1 indicates
* non-null.
*/ */
#define att_isnull(ATT, BITS) (!((BITS)[(ATT) >> 3] & (1 << ((ATT) & 0x07)))) #define att_isnull(ATT, BITS) (!((BITS)[(ATT) >> 3] & (1 << ((ATT) & 0x07))))